A device that can record images from before an event occurs is called a skipback recorder.
The images below can be saved before and after an external trigger signal is input.
You can also extract the images you need as still images.
Also, if you can use a PC without using such equipment, you can record videos before and after the trigger occurs by using a USB camera or GigE camera and equipment monitoring drive recorder software.
The biggest advantage of our PC monitor direct camera GR80XGA3 is that you can view high-resolution images on the monitor without display delays or afterimages. Another feature is that it is easy to connect directly to a monitor and can immediately check images. (No PC is required. Of course, there is no need to install any software.)
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| With arbitrary line generation function PC monitor direct camera GR80XGA3 |
Although this camera has the advantage of being directly connected to a monitor without the need for a PC, we sometimes receive requests to connect this image to a PC, or to connect it to both a PC and a monitor through a distributor.
We will introduce two ways to import images from this camera to your computer.
1. Capture board (desktop PC only)
Usually, capture boards for analog RGB (15Pin D-sub) image formats tend to be expensive.
Among them, AVerMedia Technologies’ capture board “Game Broadcaster HD AVT-C127” is relatively low priced.
We tried using this capture board to see if I could import images taken with a PC monitor direct camera to our computer.
The selling point of this capture board is that it allows you to easily record images from your iPhone/iPad onto your desktop computer, and you can purchase it at low prices at computer stores. You can also purchase it online for around 12,000 yen. When I actually used this board to take still images, I was able to take and save them without any problems.
Furthermore, by using this capture board’s dedicated capture software (RECentral), you can save videos in MP4 format. An MP4 format video shot for 20 seconds at a resolution of 1280 x 1024 (four times the resolution of a normal industrial video camera) has a relatively small capacity (size) of approximately 30MB. Generally, videos shot in AVI format have approximately 10 times the capacity as MP4 format.
Please note that for some reason, I was unable to record video using the dedicated capture software (RECentral) when I selected “AVI” as the video setting.
Of course, you can also use our Viewer software. .
A desktop Windows 8 or Windows 7 computer is required to use this capture board.
We tested it on a Windows 8 desktop computer.
I don’t know if it can be used on all desktop computers, but it can be done at a relatively low price, so I think it’s worth trying.
2. Analog RGB-USB converter (can be used with desktop PCs and notebook PCs)
Below is a converter from Epiphan.
It can be used on both desktop PCs and notebook PCs.
＜Usage example image＞
The VGA standard has no length limit, but it is generally around 30 meters.
However, commercially available cables with a length of 60 m are also available.
However, there are various extenders on the market, and if you use them, it is possible to extend beyond 300 meters.
The following is an extender that uses a LAN cable to enable extension up to 300m.
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This is an arm-type stand made for a microscope, but it can also be used conveniently as a standalone stand. |
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Attach a camera or digital loupe to the tip. |
Easily observe large objects that cannot be mounted on the stand
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Small camera base with 3D arm
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The camera equipment shown below has a female camera screw (tripod screw) that can be attached to the camera stand.
The tip has a tilt structure, so you can freely adjust the camera angle.
There are many other products available on the market.
Introduction of USB Camera Trigger Software
～Shodensha USB Camera Trigger Shooting Software Series~
We will introduce trigger shooting software that is perfect for applications such as starting recording using an embedded USB camera triggered by a trigger signal from a program controller (PLC), sequencer, etc.
・I want to build software or programs, but what should I do?
・I want to build software or programs, but I don’t have enough manpower.
・I want to build software or programs, but I don’t have the time.
・If software and programs are outsourced, they are custom-made and the price is high.
・Although it is a multi-functional software, the price is high accordingly.
・There is no need for so many functions.
→Perfect for such customers! Trigger photography software focused on a single function
The world is full of expensive trigger-compatible software that has multiple extra functions even though you only need that single function.
Our trigger shooting software series has achieved this even though only a single function is required.
Furthermore, since we focused on a single function, we were able to achieve it at a low price.
In other words, our trigger shooting software is low-priced trigger compatible software that focuses on a single function.
Petitsoft activates the desired function by inputting an external trigger signal from a program controller (PLC), sequencer, etc.
Compatible with our industrial USB cameras DN series and CS series.
By inputting an external trigger signal
・Save and capture camera images as still images (BMP/JPEG)
= Trigger shooting software HiTriggerF-Light
・Save still images simultaneously while live monitoring video from up to 4 cameras
= Multi-screen display trigger storage software HiTriggerQ
・Record a long video (like a drive recorder) before and after trigger signal input
= Equipment monitoring drive recorder HiTriggerWatcher
・Record videos for a long time, compress and save them, or record on a timer
= Compressed long-term recording software HiTriggerRec
This is the regular lineup of Shodensha trigger shooting software series for USB cameras.
Shodensha has a full-time staff of software engineers who have been engaged in image processing software development for over 30 years.
Therefore, we also accept custom orders for the trigger photography software series for DN cameras.
・I want a single function like this.
・I would like to see additional functions added to the trigger shooting software.
・I want to do something like this.
We can also develop custom software if you discuss your needs.
Don’t worry if you don’t like the program!
We will handle the production for you. (Paid)
There are generally three sensor sizes for current digital SLR cameras:
Full size: 35mm horizontally
APS-C: 23.4mm horizontally
Micro Four Thirds: 17.3mm horizontally
However, these standards are not strictly defined, and manufacturers may have different names and slight differences in actual size.
A large sensor has the following advantages:
Your field of vision will expand. For example, when attaching a microscope lens (NDPL-1), a larger sensor provides a more natural field of view.
Even with the same number of pixels, the dynamic range is expanded.
Raspberry Pi is an ultra-small, lightweight, and extremely affordable board computer developed by the British Raspberry Pi Foundation.
Although it was primarily developed for educational purposes, it is now widely used as a hobbyist and industrial IoT controller.
There are multiple models, and OS (operating systems) include Linux-based Debian, Fedora, and Arch Linux.
(It is also possible to use Windows 10 IoT Core as the OS on some models.)
In industrial applications, it is widely used to control various sensors and send data to servers through GPIO (general purpose signal input/output terminals) mounted on the board and LAN. On the other hand, in the hobby field, easy construction of high-quality music players, media servers, etc. is gaining popularity.
The photo above is a Raspberry Pi 3 Model B+.
The Raspberry Pi also has a port for a camera, but you can only connect a dedicated camera, and there are complaints that you can’t get enough image quality, you can’t change lenses, and it’s difficult to extend cables.
However, the Raspberry Pi OS also supports UVC (USB Video Class) cameras as standard.
※1 Older versions of the OS may require an upgrade. You may need to set up a UVC camera driver.
Most camera mounting screws are the same standard as tripod screws.
This standard is commonly referred to as “camera thread” or “tripod thread.”
There are very few differences between different manufacturers and camera types.
The commonly used screw size is 1/4 20UNC.
The same applies to single-lens reflex cameras, small digital cameras, surveillance cameras, and F.A.A.
The mounting screws shown in the photo below are all the same size as well.
However, although there are a small number of large and old cameras, 3/8-16UNC (3/8 inch coarse) screws may be used. In this case, the screw diameter is approximately 9mm.
Of course, you can use screws to secure the camera, but there are a variety of fixing devices available on the general market.
These fixtures come with a variety of features, including adjustable angles. Therefore, one option is to use ready-made products.
Since standard screws for cameras are used, commercially available camera accessories (tripods, pan heads, etc.) can be used. There are also conversion screws from 1/4 inch to 3/8 inch on the market, so you can use a tripod or other fixture even if the screw size is different.
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・Example of consumer product camera fixtures
The following is part of LPL Co., Ltd.’s catalog.
・Example of industrial camera fixture
The following is part of SFC Co., Ltd.’s catalog.
It may also support the lens if it is long and heavy.
(All of our microscope lenses have a fixed part with a diameter of 50 mm.)
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Cameras and lenses don’t have to be left everywhere, they need to be stored properly and correctly.
If it is not stored correctly, it may cause problems such as dust contamination and mold formation.
In this article, we will introduce how to store cameras and lenses.
One thing to keep in mind when storing cameras and lenses is dust and moisture.
If dust gets into the lens or camera sensor, it cannot be easily removed and may have an unwanted effect when shooting.
In addition, moisture can cause the lens to fog up and mold to grow.
If dust gets inside the camera or lens, or mold occurs, the only way to prevent mold is to disassemble and clean it, so it is important to prevent mold from forming.
In addition, cleaning the camera and lens (removing dust and mold) is not covered by the manufacturer’s warranty. If you ask for repairs, it will cost you a reasonable amount.
(The warranty is applied immediately after purchase, but not in the case of repairs.) ）
Therefore, care must be taken to store it from dust and moisture.
The inside of cupboards, drawers, and desks are places where dust and mold are likely to form. The same is true even if you have it in your camera bag. In general, the humidity suitable for storing cameras and lenses is about 40-50%. If the humidity exceeds 60%, mold is likely to grow, and conversely, an environment with extremely low humidity is also undesirable.
Therefore, it is important to maintain the right humidity.
You should also pay attention to temperature differences, as sudden changes in temperature can cause condensation.
First, prepare a case (storage container) to store your camera and lenses.
By placing it in the case, it prevents dust from entering, and by sealing it, it prevents moisture from entering.
Some common types of cases include:
~ Dry box (moisture-proof cabinet) ～
This is a dedicated moisture-proof storage room for storing cameras and optical equipment.
There are various types from small to large cabinet types.
It can maintain a constant humidity at all times, so you can store it with peace of mind. It is sealed and protects against moisture and dust.
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Moisture-proof storage manufacturer Toyo Living Co., Ltd.’s HP |
~Simple dry box or sealed container~
Simple dry box is easy and popular.
It is a sealed moisture-proof case provided by camera accessory manufacturers, etc., and it is possible to control humidity by putting a desiccant inside and placing a simple hygrometer.
It is easy to use because even beginners can easily store cameras and lenses. Recently, it is also possible to substitute airtight containers for food with rubber seals on the lid, which are available at 100 yen shops and home centers.
It is cost-effective and protects against moisture and dust, but requires regular humidity checks and desiccant replacement.
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Simple dry boxes and airtight containers for food should be filled with desiccant to reduce humidity.
You can also substitute a commercially available desiccant for dry boxes or silica gel for food.
Be sure to include a desiccant and a hygrometer to check the humidity.
Cameras and lenses that have been used may have dust on them.
Properly clean it before storing.
It doesn’t make sense to bring dirt in when storing cameras and lenses in an enclosed space.
Use a blower provided by a camera accessory manufacturer to blow away dust and fine particles from the camera and lens.
Carefully wipe off dirt and oil on the surface with a cleaning cloth.
Sweat and oil on your hands can lead to mold growth, so wipe them off thoroughly.
It is a question of whether or not to remove the lens from the camera when storing it, but it is okay to store it with the lens attached.
Rather, by reducing the number of times the lens is attached and detached, the risk of dust contamination can be reduced.
However, if you are going to remove the lens, it is important to attach the cap to the camera’s lens mount and store it.
Care must be taken when temporarily replacing the lens. Even if you can’t see it, there is dirt, dust, and dust floating in the air.
Even at home, you can see that dust accumulates on shelves.
When replacing lenses, the risk of dust and debris entering increases.
Therefore, you need to be very careful about how you place your camera and lenses.
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The camera sensor is bare and facing the top, and dust falls on the sensor inside the camera. |
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The C-mount part of the lens is exposed and facing the top, and dust falls on the lens. |
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The side of the lens object is bare and facing the top, and dust falls on the lens. |
When you buy a camera or lens, it may come with a cap (lid).
Installing the cap as soon as possible reduces the risk of dust contamination.
When changing the lens, it may be temporarily placed on the desk, but care must be taken when doing so.
Make sure that the surface of the sensor or lens is not facing up, and that it is placed sideways to prevent dust from adhering to it.
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Even if the camera sensor is placed sideways, there is still a danger. Therefore, it is advisable to install the cap as soon as possible. |
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Even if the surface of the lens is placed sideways, there is still a risk. Therefore, it is desirable to install the cap as soon as possible. |
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Attach caps to both ends of the lens and attach caps to the camera body. |
・The camera and lens are sensitive to dust and moisture.
・If dust or mold gets into the camera or lens, it will be difficult to remove. Therefore, it is important to store it in an environment where dust and mold do not form.
・To prevent dust and mold from forming, store it in a special case.
・Before storing, take good care of the camera and lens and do not bring in dust, dirt, or grease.
・There is no problem even if the lens is attached.
・Caution must be taken when temporarily storing or replacing lenses.
When using a USB camera, there is also a software option to apply digital zoom, but this may come at the expense of resolution.
For example, if you use a 2 million pixel camera at full resolution, the resolution will be 1600×1200.
The resolution is 800 x 600 = 480,000 pixels. If the magnification is 2x, the resolution will be 1/4, and if it is 3x, it will be 1/9.
Even in the case of 5 million pixels, it will be 1.25 million pixels with 2x digital zoom and 550,000 pixels with 3x.
Optical zoom, on the other hand, allows you to increase the magnification without sacrificing resolution (although it actually drops slightly).
Even if the lens does not have the ability to increase the focal length, you can easily increase the magnification by using a component called a rear converter. In addition, when using a rear converter, there is no need to change the installation position of the camera, since the focal length and other factors do not change.
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2倍のリアコンバータ |
Dimmable even when lighting independently in 4 parts!
With a removable diffuser plate!
● Inner diameter φ70mm, tip inner diameter φ60mm, outer φ96mm
● 4 divisions can be lit independently
● Dimmable even when lighting independently in 4 divisions
● Diffuser plate can be removed
● Can be attached to microscopes, microscopes,…
With removable diffuser plate!
High luminance type with 80 lamps arranged in two lines
●Inner diameter φ70mm, tip inner diameter φ60mm, outer diameter φ96mm
●With removable diffuser plate.
●Separate control box. Convenient for dimming at hand.
●Can be attached to microscopes, microscopes, etc.
●Robust metal body for efficient heat dissipation
Below are the upper and lower limit adjustment stays for our camera stands.
The adjustment stay of our camera stand has the following structure. |
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27mm pitch |
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The following is a lens that we manufactured according to the customer’s lens size. We can also accommodate such requests. |
| The tip is fixed with a 27mm pitch M3 screw. | |
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A 5.5Kg base is attached to a post and horizontal bar.
The base acts as a weight, so the horizontal bar is stable even if it is long.
Horizontal bars on edge-fixed posts
■Windows environment
■Linux environment
When using a lens with the same magnification, the smaller the number of inches in the image size, the larger the magnification and the narrower the field of view.
Take a look at the pictures below.
The lens, monitor, and focal length are taken under the same conditions.
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1/2 inch camera
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1/2.5 inch camera
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1/3 inch camera
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You can see that the 1/3 inch camera has a narrower field of view than the 1/2 inch camera.
Also, when selecting a lens, it is necessary to check the compatible image sensor size of the camera.
Please note that if you select a lens that is smaller than the camera’s compatible image sensor size, a phenomenon called vignetting may occur.
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You can see black areas (vignetting) in the four corners of the screen. |
We can also help you with the selection of lenses and cameras. For more information, please contact Technical Support.
What is gamma adjustment?
１．The color contrast is adjustable.
２．It can reduce reflections and blackouts. (HDR-like video effects)
The IMX183 has a pixel size of 2.4×2.4 μm and is a rolling shutter sensor.
The pixel size is as small as 2.4 μm and the sensor size is 1 inch. SONY’s unique back-illuminated technology achieves excellent image quality with high sensitivity, making it ideal for building optical systems.
Number of pixels: 20 million pixels (resolution 5472×3648)
Pixel size: 2.4μm×2.4μm
Sensor Size: 1 inch
Shutter method: Rolling shutter
USB3 Vision Camera (USB3.0, 20 million pixels, color) CS2000-C |
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USB3 Vision Camera (USB3.0, 20 million pixels, monochrome) CS2000-B |
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1-inch GigE camera (20 million pixels, color) EG2000-C |
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1-inch GigE camera (20 million pixels, monochrome) EG2000-B |
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The IMX226 has a pixel size of 1.85×1.85 μm and uses a rolling shutter method.
SONY’s Pregius series is characterized by high sensitivity and low noise performance. The sensor is 1/1.7″ in size and is available with standard and affordable 2/3″ C-mount lenses.
Number of pixels: 12 million pixels (resolution 4000×3036)
Pixel size: 1.85μm×1.85μm
Sensor size: 1/1.7 inch
Shutter method: Rolling shutter
USB3 Vision Camera (USB3.0, 12 million pixels, color) CS1200-C |
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USB3 Vision Camera (USB3.0, 12 million pixels, monochrome) CS1200-B |
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GigE camera (12 million pixels, color) EG1200-C |
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GigE camera (12 million pixels, monochrome) EG1200-B |
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Includes a polarizing filter to reduce halation!
The IMX178 is a rolling shutter sensor with a pixel size of 2.4×2.4 μm.
SONY’s Starvis series supports high sensitivity even in low-light environments by increasing the gain. The sensor has a resolution of 6 million pixels, a size of 1/1.8 inch, and a wide dynamic range, making it suitable for a variety of applications.
Number of pixels: 6 million pixels (resolution 3072 x 2048)
Pixel size: 2.4×2.4µm
Sensor size: 1/1.8 inch
Shutter method: Rolling shutter method
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GigE camera (6 million pixels, color) EG600U-C
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GigE camera (6 million pixels, monochrome) EG600U-B
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The IMX264 has a pixel size of 3.45×3.45 μm and the sensor uses a global shutter method. The Pregius series manufactured by SONY is characterized by high sensitivity and low noise performance. This sensor is 2/3 inch in size, has a wide dynamic range, and has a resolution of 5 million pixels, making it suitable for a variety of applications.
Number of pixels: 5 million pixels (resolution: 2448 x 2048)
Pixel size: 3.45×3.45µm
Sensor size: 2/3 inch
Shutter method: Global shutter
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GigE camera (Sony 5 million pixels, color) EG501-C
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GigE camera (Sony 5 million pixels, monochrome) EG500-B
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At this price, it can be used overseas with double LED arrangement and light intensity increase 100 ~ 240V.
● Control box separate type. It is convenient because it can be dimmed at hand.
● Diffusion plate is standard equipment
● 56 LEDs are double-arranged to increase the amount of light
● Can be attached to microscopes, microscopes,…
● The body is a robust metal case. Good heat dissipation efficiency
Many industrial cameras have external trigger terminals.
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| USB Camera DN Series | USB Camera CS Series |
This trigger pin is used to control the timing of still image shooting and video recording with a sensor or PLC (programmable logic controller).
Watch the video brief image below.
Of course, even if you don’t use an external trigger, you can use the included application software to save still images and record videos.
However, in actual production lines, it is common to shoot and record at the timing of the object to be photographed, and there are many situations where an external trigger terminal of an industrial camera is required.
Watch the video brief image below.
When using external trigger terminals, there are various ways to use them depending on the customer’s production line.
In addition to simply saving still images and recording videos, it can be used for a variety of purposes, such as recording videos before and after a problem occurs, or shooting and recording with multiple cameras.
Therefore, when using an external trigger pin, it is basically assumed that the customer will program it himself.
Industrial cameras usually come with an SDK (Software Development Kit) for development, which is used to create programs.
I mentioned that “basically create a program”, but if it is a simple function, application software can be used.
By using it, you can build a system without any knowledge of programming.
Among them, we will explain the most basic “saving still images with an external trigger”.
Even with the simple function of “saving one still image when an external trigger signal is input”, there are two main methods.
And the time display between the trigger and the next trigger is different.
(1) A still image taken with the latest trigger is displayed between the trigger and the next trigger.
・Saved images can be reliably checked in real time.
Even lines with movement can be visually checked using still images.
・When shooting with multiple cameras at the same time, it is possible to shoot perfectly in sync.
We offer the following software:
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Trigger Shooting Software Hi TriggerF Light |
High-performance trigger shooting software Hi TriggerF Pro |
(2) A method is adopted in which live video is displayed between the trigger and the next trigger.
・Since the live image is always displayed, it is possible to monitor the status of lines other than the object.
・When shooting with multiple cameras at the same time, multiple frames may be out of alignment.
We offer the following software:
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Four-screen display shooting software Hi TriggerQ |
In the case of video recording, there are the following two types.
(1) Use the start trigger and stop trigger as triggers
(2) Use only the start trigger as a trigger
In the case of (1), only a simple recording function is provided.
In the case of (2), various functions are available.
In addition to simply recording the specified time by timer control from the trigger, you can also record before and after the trigger (operation like a drive recorder). It is useful for event analysis when a problem occurs.
We offer video recording software that allows you to use both Start/Stop triggers, timers, etc.
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Long-Duration Recording Software Hi TriggerRec |
Software to record video before and after the trigger
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Facility monitoring drive recorder Hi TriggerWatcher |
Robots, conveyors, drones, AI-based automated inspections, etc., can be linked to external triggers to become independent automated equipment for the first time.
At Shodensha, we help with system development and software development using cameras.
A 5.5Kg base is attached to a post and horizontal bar.
The base acts as a weight, so the horizontal bar is stable even if it is long.
Horizontal bars on edge-fixed posts
We introduce a small camera stand that is convenient for carrying around.
Before assembly, it looks like the following.
The following image is shown when the borescope camera system is installed.
We can also manufacture custom stands to meet your needs.
The pixel size of this IMX265 is 3.45 x 3.45μm, and it is a global shutter type sensor.
Sony’s Pregius series is known for its high sensitivity and low noise.
The resolution is 3.2 million pixels and the sensor size is 1/1.8 inch, so there are many lens options. It can be said that this model has a good balance between image quality and frame rate (speed).
Number of pixels: 3.2 million pixels (resolution: 2048 x 1536)
Pixel size: 3.45×3.45µm
Sensor size: 1/1.8 inch
Shutter method: Global shutter method
GigE camera (Sony 3.2 million pixels, color) EG320-C |
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GigE camera (Sony 3.2 million pixels, monochrome) EG320-B |
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The pixel size of this IMX287 is 6.9 x 6.9μm, and it is a global shutter type sensor.
SONY’s Pregius series is known as a high-speed sensor. If you are using the CCD sensor ICX618, as a transition to a CMOS sensor, this IMX287 has a similar pixel size and resolution, minimizing changes to peripherals such as lenses.
Furthermore, despite the low price, the sensor performance has been significantly improved.
Number of pixels: 400,000 pixels (resolution 720 x 540)
Pixel size: 6.9×6.9μm
Sensor size: 1/2.9 inch
Shutter method: Global shutter method
USB3 Vision camera
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USB3 Vision camera
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GigE camera (400,000 pixels, color) EG41-C |
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GigE camera (400,000 pixels, monochrome) EG41-B |
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The USB2.0 standard usually recommends a length of up to 5m.
However, in reality, cables that exceed this length are sold by major manufacturers. (Generally speaking, it is said that there is no significant effect on communication speed up to about 10m).
In addition to simple extension cables, USB cables with repeater functionality are also available. These are also commonly referred to as active cables.
Multiple companies sell these products, but the product in the photo is Sanwa Supply Co., Ltd.’s KB-USB-R212 [12m extension USB active repeater cable].
According to USB cable standards, the maximum connection distance between devices is usually 5 meters. However, by using this “USB cable with repeater function”, you can connect devices with a cable longer than 5m. The product in the photo can be extended up to 12m using this cable.
This cable has a built-in signal amplification correction circuit. This circuit compensates for signal attenuation and allows cable extension. This cable can be extended over 12m. In that case, wire as shown below.
I tried connecting a 12m USB cable with repeater function (product in the photo) and the cable (1.8m) that came with the camera to our USB camera, and it worked without any problems. However, the instruction manual for the USB cable with repeater function (product in the photo) states, “To ensure stable operation and recognition, we recommend that the connected USB device be a self-powered device.” there was.
Of course, there are also active cables that use USB power (bus power). It is convenient and does not require a power supply, but if your PC’s power supply is weak, stability may be a problem.
Extending the USB cable will cause a voltage drop, so we recommend that you always check the operation when using devices that are powered by a PC (including our USB cameras).
If you want to use multiple cameras, you need a high-performance PC. (The use of laptops is not guaranteed.) In general, as the resolution and number of cameras increase, so do the required specifications of the PC. The following are recommended specs, but this is a guide.
・CPU: 12th generation or later Intel Core i7 (12th generation or later Intel Core i9 is recommended for 4 or more cameras)
・RAM: 16 GB or more
If you’re recording for a long time, add the above specs to a GPU like the RTX 3070.
If you have more than 4 cameras, we recommend adding a USB board or a LAN board for GigE cameras to account for bandwidth limitations. To add a board, the required PCIe slot must be free.
Also, the amount of storage space you need depends on your camera’s resolution, fps, and recording time. The following is an estimate of the storage time that can be stored on each camera when using 1TB of storage.
1TB SSD
| 400,000 pixels 30fps | Compression | 160h |
| Non – compression | 6h45min | |
| 1.3 million pixels 30fps | Compression | 48h |
| Non – compression | 2h | |
| 5 million pixels 30fps | Compression | 11h |
| Non – compression | 28min |
※If there are 2 cameras, the time will be 1/2, and if there are 4 cameras, the time will be 1/4. When performing compressed recording, it may be possible to secure sufficient writing speed with an HDD depending on the number of cameras and fps.
When recording with multiple cameras at the same time, there may be a deviation of several frames between cameras due to factors such as camera clock and component deviations, aging, and the ambient temperature at which they are used.
Due to the complex interplay of these factors, it is difficult to give a specific amount of deviation, but as a general guideline, if you record for more than 8 hours, there may be a deviation of about 1 to 2 seconds.
Synchronous recording is a method that completely eliminates the above deviations and makes recordings without deviations. Synchronous recording uses not only a camera, but also a synchronous signal generator.
Multiple cameras are fed into the signal from the synchronous signal generator at exactly the same time, and only the frame at the time when the signal is entered is recorded, resulting in perfectly synchronized recording and not being affected by the camera clock or environment.
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Multi-unit video recording software Software that allows “multiple cameras” to record “simultaneously” is ideal for creating evidence and evidence of problems that arise in the field. |
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Fully synchronized recording set for USB/GigE cameras with multiple units (long-term recording software) Software that enables “fully simultaneous and synchronous recording” with “multiple cameras” is also available. |
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USB/GigE Camera Fully Simultaneous and Synchronized Facility Monitoring Drive Recorder Software that enables “fully simultaneous and synchronous recording” with “multiple cameras” is also available.
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Due to space constraints, it may be necessary to configure the camera and lens in a compact manner.
In such cases, compactness can be achieved by choosing an S-mount lens that is smaller than a C-mount or CS-mount lens.
In order to use S-mount lenses, you need to attach a conversion adapter to the camera.
However, there is a caveat.
With S-mount lenses, the focus is adjusted depending on how well it is inserted into the camera.
Cameras usually have an infrared cut filter or a protective filter in front of the sensor.
In some cameras, the distance between the filter and the lens mount is close, and the lens may interfere with the filter when focusing, resulting in a lack of focus.
It is necessary to actually try and check whether the S-mount lens can be attached and used with the camera.
When using the same lens, the smaller the size of the image sensor, the narrower the field of view. In addition, the size of the image sensor is a necessary factor in the calculation of the field of view and the selection of the lens. (More on this later.)
The size of a single pixel can also be calculated from the size of the image sensor
For example, if the image sensor size of 1.3 million pixels (1280 dots × 1024 dots) is 1/2.5 inch, the horizontal orientation is 5.6 mm and the vertical direction is 4.2 mm.
In this case
Horizontal 5.6mm/1280dot=0.0044mm/dot
Vertical direction is 4.2 mm/1024 dot = 0.0041 mm/dot.
Usually, when we say size on a monitor, we are referring to the length of the diagonal.
However, the size of the image sensor is not the length of the diagonal.
For example, in the 1/2.5-inch image sensor with 1.3 million pixels mentioned earlier, the horizontal direction is fixed at 5.6 mm and the vertical direction is fixed at 4.2 mm.
If we calculate from this figure, then the diagonal length will be 7 mm. But the actual diagonal length of 1/2.5 inch is 10.16mm.
This is due to the influence of the size notation of the diameter of the imaging tube in the era when vacuum tubes were used in the past, and the image sensor is also matched to the size of the imaging tube, and that notation remains as it is.
4:3 horizontal and vertical image sensor
19:6 horizontal and vertical image sensor
When choosing a lens or calculating the distance to an object, the size of the image sensor is required.
The following factors are required to calculate the required lens based on the size of the object: the size of the camera’s image sensor and the distance to the object (W.D.).
For example, if the distance to the object is 1 meter and the vertical field of view is 300 mm, what focal length lens should you choose? (Let’s assume we use a 1/2 inch camera).
The image sensor size of a 1/2 inch camera is as follows.
Focal length (f) = (distance to object (mm) x vertical size of image sensor (mm)) / vertical field of view = (1000mm x 4.8mm) / 300mm = 16mm
Therefore, choosing a lens with a focal length of 16mm will ensure the desired vertical field of view. Horizontal field of view can be calculated similarly.
Note that once you know the vertical or horizontal field of view, you can easily calculate the other field of view. A square image sensor has an aspect ratio of 4:3, so in the above case, the horizontal field of view is 300mm x 4/3 = 400mm.
Lenses that magnify objects often have a fixed focal length.
In this case, the characteristics of the lens cannot be expressed by the focal length (f value).
In the case of microlenses, performance is expressed in terms of optical magnification.
With a lens with an optical magnification of 1x, the field of view you want to observe matches the size of the image sensor.
For example, the size of a 1/3 inch image sensor is 4.8 mm x 3.6 mm, and the size of a 1/2 inch image sensor is 6.4 mm x 4.8 mm. We would appreciate it if you could check the specifications of our macro lenses based on this information.
The size of the image sensor is also used to calculate the total magnification (the final magnification displayed on the monitor) when using a macro lens.
For details, see “How to consider the magnification of a microscope.”
| USB camera CS series | USB camera DN series | GigE camera | |
| 1/1.1 inch |
CS1200-GC (12 million pixels, color)/ CS1200-GB (12 million pixels, monochrome) |
EG1200-GC (12 million pixels, color)/ EG1200-GB (12 million pixels, monochrome) |
|
| 1/1.7 inch |
CS1200-C (12 million pixels, color)/ CS1200-B (12 million pixels, monochrome) |
EG1200-C (12 million pixels, color)/ EG1200-B (12 million pixels, monochrome) |
|
| 1/1.8 inch |
DN3RG-130 (1.3 million pixels, color)/ DN3RG-200 (2 million pixels, color)/ |
EG320-C (3.2 million pixels, color)/ EG320-B (3.2 million pixels, monochrome) EG600U-C (6 million pixels, color)/ EG600U-B (6 million pixels, monochrome) |
|
| 1/2.3 inch | DN3R-1000 (10 million pixels, color) | ||
| 1/2.5 inch | CS500-C (5 million pixels, color)/ CS500-B (5 million pixels, monochrome) |
DN3R-500 (5 million pixels, color) | |
| 1/2.9 inch |
CS41-C (400,000 pixels, color)/ CS41-B (400,000 pixels, monochrome) |
EG41-C (400,000 pixels, color)/ EG41-B (400,000 pixels, monochrome) |
|
| 1/2 inch |
CS130U-C (1.3 million pixels, color)/ CS130U-B (1.3 million pixels, monochrome) CS500U-GC (5 million pixels, color)/ CS500U-GB (5 million pixels, monochrome) |
EG130U-C (1.3 million pixels, color)/ EG130-B (1.3 million pixels, monochrome) |
|
| 1 inch |
CS2000-C (20 million pixels, color)/ CS2000-B (20 million pixels, monochrome) |
EG2000-C (20 million pixels, color)/ EG2000-B (20 million pixels, monochrome) |
|
| 2/3 inch |
EG501-C (5 million pixels, color)/ EG500-B (5 million pixels, monochrome) |
Summary
The size of the image sensor is information necessary for calculating the field of view and selecting a lens. For CCTV lenses, use the following formula when calculating the lens for the desired vertical field of view:
f value = (distance to object (mm) x vertical size of image sensor (mm)) / vertical field of view
For macro lenses, the size of the image sensor is used to calculate the total magnification that will ultimately be displayed on the monitor.
The “flicker phenomenon” refers to a phenomenon in which abnormalities such as “light and dark fluctuations” and “color tone shifts” appear in images captured by a camera, although they cannot be detected with the naked eye.
In this article, we will introduce “What is the Flicker Phenomenon” and “How to Mitigate the Flicker Phenomenon”.
Some lighting devices flash to match the power frequency, while others pulse as a dimming system.
Although the flashing of light cannot be felt with the naked eye, if the shutter speed of the camera is faster than the blinking cycle, abnormalities such as “light and dark fluctuations” and “color tone shifts” will occur in the captured image. This is the flicker phenomenon.
The flicker phenomenon occurs under lighting such as fluorescent lamps that emit periodic light, and does not occur under direct current lighting.
There are two main symptoms of flicker.
In a camera with a global shutter system, the entire image periodically repeats fluctuations in brightness.
On the other hand, with a rolling shutter camera, horizontal stripes may appear in the footage, which may appear to flow vertically.
< Flicker Phenomenon: Horizontal Stripes of Light and Dark in Rolling Shutter Cameras>
Basically, there are only three ways.
1. Use a direct current lighting system.
2. Set the shutter speed to be slower than the blinking speed.
3. Use a camera equipped with a “flicker-free function”.
It occurs under lighting that repeatedly emits periodic light, and does not occur in lighting with direct current lighting.
The flicker phenomenon can be suppressed to some extent by adjusting the camera’s exposure time or shutter speed, but it cannot be completely eliminated. Even if the flicker seems to disappear, the light and dark are changing over a long period of tens of seconds or more. Especially when using a high-speed camera under fluorescent lighting, a significant flicker phenomenon occurs.
※ If the shutter speed cannot be adjusted on the camera side, the aperture of the lens can be adjusted to compensate for the lack of illumination with DC lighting to reduce the effect of pulse lighting relatively.
The “flicker-free function” is a function in which the camera automatically detects the flashing of the light source and releases the shutter at a timing that has little effect on the brightness and color tone.
To avoid the flicker phenomenon, use direct current lighting or strobe lighting synchronized with the camera shutter for high-speed camera lighting.
We offer a wide range of high-speed cameras and lighting equipment suitable for those applications, such as high-speed camera lighting and strobe lighting.
If you are suffering from the flicker phenomenon, please feel free to contact us.
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Low-cost high-speed camera (Color/ Monochrome) CHU30-C-RS / CHU30-B-RS
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High-Speed Camera CHU130EX
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Simple Lighting for High-Speed Camera SCH-SN48W
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Strobe Lighting CH-SN
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When using a camera with a wide field of view or a long operating distance, the support of the stand may be reflected.
In this case, adding a horizontal stay to a regular camera stand can avoid reflection.
The following camera accessories are also available at camera specialty stores.
If you would like to know more about our products, please contact our technical support.
The load capacity of the camera angle attached to the end of the flexible arm (FA100-M) manufactured by Shodensha is 5 kg.
By attaching this to the camera stand, it can be made into a 5 kg load-bearing type.
(A normal camera stand weighs 2 kg.)
In order to attach the camera angle for flexible arm to a 25mm dia. post, the following parts must be custom-made.
Since they are custom-ordered, the length can be manufactured according to your request.
Production Examples
<Camera stand with a load capacity of 5kg
Camera mounting screws are common in most cases.
In many cases, thermographs and large high-speed cameras also share the same mounting screws.
If you are looking for a stand with a high load capacity, you can easily find one by looking for camera supplies.
Although dedicated equipment may be available, we will introduce an easier and less expensive way to take pictures.
Load capacity 5kg type
Load capacity 10kg type
Shodensha also has a custom-made camera stand with a load capacity of 5 kg.
