What is an event-based vision camera?

Just as the human eye perceives light…
It is believed that the human brain "selects" information from vision and processes it efficiently.

Playing with dogs in a large fieldDogs
FishingRod tip or float
LifesaversFlow of people and abnormal movements on the sea
Driving a carCars or pedestrians in front of you
Inspection workProduct operation or appearance

etc. 
These are examples of how the brain's processing ability is thought to be streamlined by perceiving changes in light (objects) captured by vision as vivid at the point of interest and ambiguous around the point of interest.

An event-based vision camera is characterized by its high-speed output of information on changes in light (objects) in single-pixel units. This feature is similar to passing visual information (image data) to the brain (CPU) at high speed.

Conventional frame-based cameras output frame rate data (e.g., 30 images per second at 30 fps), so the image processing load performed by the CPU is enormous.

In contrast, event-based vision camera is expected to reduce CPU load because the output data itself is more efficient. In addition, it has the feature of high-speed detection because it transmits light change information at the microsecond level for each individual pixel.

Mechanism of event-based vision sensor

The event-based vision sensor detects the luminance changes in each pixel and extracts only those that exceed the preset threshold value then outputs the event "coordinate, polarity, and time". This operation is performed independently and asynchronously for each pixel.

Light incident on each pixel is converted into a voltage, the delta from the reference voltage is detected, and an event is output when the threshold value is exceeded in a comparator.

Differences from conventional cameras

While conventional cameras output information for the entire screen according to a fixed frame rate, event-based vision cameras output asynchronously data only for pixels that have undergone a change in brightness or darkness. Thus, high temporal resolution (in 1 µsec increments), low data rate, and low power consumption are achieved simultaneously.

Conventional camera ▽

Event-based vision camera

It outputs data of all pixels in every frame.

Areas with no luminance change (background or parked cars) are not be output.

The features of the event-based vision sensor are also explained on the Sony Semiconductor Solutions Corporation (SSS) website (external site).

Use cases

Industry

Motion detection, piece counting, vibration detection, weld monitoring, measurement, etc.

Security

Intruder detection, low-light area monitor, flow line monitor, etc.

Robotics

Obstacle detection, abnormality detection, data for AI, object measurement, automatic positioning, etc.

Chemistry, Research

Fluid Monitoring, Microscopic Detection, Research and Development, New Technology Development, etc.

Sample Video

Material 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.

Wide dynamic range

Even in intense light that would cause halation with a conventional camera, an event-based vision camera can reliably capture the subject.

Slow Motion

With an event-based vision camera that outputs per-pixel 'coordinate, polarity, and time' data asynchronously, you are free to generate video with a different frame rate after capture.

Software toolkit

All SilkyEvCam products can use the "Metavison™ Intelligence Suite", a software toolkit provided free of charge by PROPHESEE. It supports everything from first-time image output and prototype evaluation to full-scale application development.

The "Metavison™ Intelligence Suite" provides basic libraries, algorithms, and practical sample programs for handling with event-based vision camera data.
For more information, please visit PROPHESEE website (external site).

CenturyArks event-based vision cameras

  • Each pixel outputs data of motion asynchronously, independently from any other.
  • Highly efficient data (1/10 to 1/1000 of data volume compared to frame-based camera)
  • Wide dynamic range
  • Frame rate can be changed after recording
  • No motion blur
  • Compact size can be installed anywhere (30mm x 30mm x 36mm)
  • Free plug-in for PROPHESEE's SW development environment and algorithm library, METAVISION™ Intelligence SDK

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  • SilkyEvCam® is a registered trademark of CenturyArks Co., Ltd
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  • The specifications and other information in this document are subject to change without notice.

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