Main features of Event-based Visio Camera
Capture motions
(Captures changes in light only)
The SilkyEvCam screen shows only moving cars, motorcycles, and pedestrians; it does not show motionless roads and buildings, etc. This is a clear example of one of the features of Event-based vision camera.
Conventional camera cannot capture dark-colored vehicles clearly, but SilkyEvCam can capture them clearly. Pedestrians walking in the shadows are also clearly captured.
Capture high-speed events (Minimum time resolution (1μsec))
In a video taken with a conventional camera, the flying rubber bands cannot be distinguished at all. With SilkyEvCam in a normal speed, you can see the shape of the flying and bouncing rubber bands.
A golf iron impact was captured by an event-based camera (SilkyEvCam HD) and then a 100,000 FPS video was made. The dimples on the golf ball are also clearly visible.
Less affected by ambient lighting conditions (Wide Dynamic range (>120dB))
With the event camera's impressive wide dynamic range (>120dB), it captures a toy car even in deep darkness in the background or intense light in the foreground, where conventional cameras would be overexposed. You can also see the text on the windshield.
Capture sudden events (Long-time recording w/low data capacity & low power consumption)
The video shows raindrops falling from the tip of leave. With SilkyEvCam, it is possible to shoot for a long time, making it easy to make slow-motion images of events that could happen at any time.
Optical flow & Tracking
The length and color of the arrows indicate the speed and direction of movement of the small balls in the box. The background is visible in the normal camera image, but not in the event-based vision camera. This is one of the features of this camera.
Create videos with different frame rates from the raw data after shooting
You can create several different frame rate videos from the Raw data. At higher frame rates, numerous fine splashes can be seen, and they are flying far more than we expected.
Applications
| Visual inspection | Capture fluids | Particle detection | Drop behavior | Sealing test |
| Gas injection | Cutting and soldering | Equipment vibration detection | Infrastructure |
Visual inspection
The clear glass bottle was captured with an event-based camera. The relief on the glass bottle is clearly visible in the event-based camera video. We also captured the colored bottle. The word "ROSE" on the bottle is visible from the other side of the bottle.
A 120mm x 140mm aluminum plate is illuminated with LED lighting from the front. The aluminum plate is moved from side to side to generate the event. (There are four screw holes in the aluminum plate.) The event-based camera captures fine scratches that are difficult to see with the naked eye. A 10mm diameter stainless steel pipe is illuminated with LED lighting from the front. The pipe is rotating to generate the event. Scratches on the pipe are clearly captured by the event-based camera.
Capture fluids
We shot water flowing over the rail as if it is the flow of a river. In a video taken with a conventional camera, the flow of transparent water cannot be seen clearly, but with SilkyEvCam, you can clearly see the flowing water. You can also see the water overflowing in front of the rail.
A silicon wafer is set on a spin coater and rotated at 10000rpm. The behavior of the liquid when pure water was dropped using a pipette was filmed with SilkyEvCam HD.
Water is stirred using a magnetic stirrer, and the scene is captured by an event camera. The event camera captures the movement of the vortex generated by the stirring and the microscopic bubbles that are generated around the vortex as they rotate up and down.
Particle detection
The water flow is visualized by adding particulates to the water in the tank and capturing their reflected light with an event-based camera (SilkyEvCam VGA). The direction, length, and color of the arrows clearly show the complex flow of water that is difficult to see in conventional camera images.
Drop behavior
The video shows a water stream of approximately 1 mm in diameter injected from a syringe. SilkyEvCam can create videos with changed frame rate after shooting. In this video, 0.02 seconds of the phenomenon is shown in slow motion video at 10000 FPS and 100000 FPS.
Sealing test
The tube submerged in an aquarium has three holes, large, medium, and small. Air bubbles are coming out of them. The bubbles are captured and counted by an event-based camera (SilkyEvCam HD).
Gas injection
The gas sprayed from the spray can go straight at the beginning of spray, but start to spread on the way, and hit a wall, and then spread along the wall.
Even a lighter that lights up in an instant, when viewed in slow motion, we can discover that many things (phenomenon) happen to lead to ignition.
Cutting and soldering
The flying shavings that occur during cutting of an aluminum plate are captured by an event-based camera (SilkyEvCam HD). The rotation of the drill and the flying trail of shavings are clearly visible.
The left image shows a frame camera video and the right image shows an event-based camera video. BothView uses a single lens to capture video without parallax. By playing back the recorded event data in slow motion, you can clearly see how the molten solder flows, how the molten solder pulls and shakes when the soldering iron moves away, and how the solder hardens afterwards.
Equipment vibration detection
The vibration cycles are visualized using colors (warm colors for lower frequencies, cool colors for higher frequencies). It is also possible to specify a location to calculate the frequency. In this example, the speed of the USB fan was switched from high to low and back to high. You can observe how the detected frequencies change accordingly.
A Stirling engine is an engine in which heat is applied from the outside of s sealed cylinder and the piston is moved by the expansion and contraction of air. An event camera tracks temporal changes in pixels to determine vibration frequencies with high accuracy.
Infrastructure
We attached a telephoto lens to our event based camera (SilkyEvCam HD) to capture images of cars traveling on the road about 400 meters away in the daylight and night.
With the event camera's impressive wide dynamic range (>120dB), it captures a toy car even in deep darkness in the background or intense light in the foreground, where conventional cameras would be overexposed. You can also see the text on the windshield.
Traffic situation with tracking mode taken with the Event-based camera (SilkyEvCam HD) made by CenturyArks Co., Ltd. The system detects and tracks objects moving on the road. Multiple algorithms are available depending on the target you wish to track, so that you can start to use them.
The lightning strike occurred just after the bird flew in the rain. At the normal frame rate (30FPS), the lightning trails were not visible, but as we increased the frame rate, it was able to capture the beautiful lightning streaking across the sky.
By increasing the frame rate, you can see how each raindrop falls.
Others
Comparison of SilkyEvCam (VGA)とHD
Both videos show cars driving on the road during the day.
Top) VGA, Bottom) HD
In the HD video, even smaller movements, such as the sway of the street trees' leaves in the bottom right, are captured.
SilkyEvCam BothView C-mount Model (Capture event & frame- based data simultaneously)
The top right shows the frame camera video, and the bottom left shows the event camera video. The combined video is displayed in the top left. In the frame video, the background colors of the aquatic plants and the tank make it difficult to see the fish. On the other hand, the event video does not capture stationary objects like the plants. In the top left video, the movement of the fish swimming quickly through the plants is clearly visible.
CenturyArks YouTube Channel
We have many more sample videos! On CenturyArks' YouTube channel, we regularly post videos tailored to our customers' needs, as well as unique videos born from our staff's curiosity. Be sure to check them out!
Training Videos
SilkyEvCam Introduction Guide
Please take a look if you're using the event-based vision camera, SilkyEvCam, for the first time! This guide explains how to assemble the camera, install the necessary software, and get started with capturing footage.
Metavision SDK Training Videos (Prophesee S.A. website)
Metavision SDK Training Videos (Prophesee S.A. website)
https://support.prophesee.ai/portal/en/kb/articles/all-training-videos
Event-based vision camera captures motions.
The SilkyEvCam screen shows only moving cars, motorcycles, and pedestrians; it does not show motionless roads and buildings, etc. This is a clear example of one of the features of Event-based vision camera.
Conventional camera cannot capture dark-colored vehicles clearly, but SilkyEvCam can capture them clearly. Pedestrians walking in the shadows are also clearly captured.
Tracking
The system detects and tracks objects moving on the road. Multiple algorithms are available depending on the target you wish to track, so that you can start to use them.
The water flow is visualized by adding particulates to the water in the tank and capturing their reflected light with an event-based camera (SilkyEvCam VGA). The direction, length, and color of the arrows clearly show the complex flow of water that is difficult to see in conventional camera images.
Slow Motion
You can create several different frame rate videos from the Raw data. At higher frame rates, numerous fine splashes can be seen, and they are flying far more than we expected.
At a normal playback speed, the water appear to be splashing on the surface of the water, but in slow playback speed, you can see the ripples created by the raindrops. SilkyEvCam can create videos with changed frame rate after shooting, not the concept of "slow motion shooting"
The video shows raindrops falling from the tip of leave. With SilkyEvCam, it is possible to shoot for a long time, making it easy to make slow-motion images of events that could happen at any time.
By increasing the frame rate, you can see how each raindrop falls.
In a video taken with a conventional camera, the flying rubber bands cannot be distinguished at all. With SilkyEvCam in a normal speed, you can see the shape of the flying and bouncing rubber bands.
The gas sprayed from the spray can go straight at the beginning of spray, but start to spread on the way, and hit a wall, and then spread along the wall.
Even a lighter that lights up in an instant, when viewed in slow motion, we can discover that many things (phenomenon) happen to lead to ignition.
The video shows a water stream of approximately 1 mm in diameter injected from a syringe. SilkyEvCam can create videos with changed frame rate after shooting. In this video, 0.02 seconds of the phenomenon is shown in slow motion video at 10000 FPS and 100000 FPS.
The flying shavings that occur during cutting of an aluminum plate are captured by an event-based camera (SilkyEvCam HD). The rotation of the drill and the flying trail of shavings are clearly visible.
The lightning strike occurred just after the bird flew in the rain. At the normal frame rate (30FPS), the lightning trails were not visible, but as we increased the frame rate, it was able to capture the beautiful lightning streaking across the sky.
A golf iron impact was captured by an event-based camera (SilkyEvCam HD) and then a 100,000 FPS video was made. The dimples on the golf ball are also clearly visible.
Others
We shooted water flowing over the rail as if it is the flow of a river. In a video taken with a conventional camera, the flow of transparent water cannot be seen clearly, but with SilkyEvCam, you can clearly see the flowing water. You can also see the water overflowing in front of the rail.
The tube submerged in an aquarium has three holes, large, medium, and small. Air bubbles are coming out of them. The bubbles are captured and counted by an event-based camera (SilkyEvCam HD).
We have posted many sample videos on customer requests and our staff's interests! Please visit the CenturyArks YouTube channel to check them out!