HIGH-SPEED IMAGING
Left: coded measurement targets are placed on the mudguard with which each camera aligns itself; right: WheelWatch motion analysis test bench
cameras are available that record changes in a scene, rather than each pixel registering light irrespective of what is happening in front of the lens. Prophesee has recently released an
industrial event-based vision sensor in a standard commercial package. Te neuromorphic vision technology – it mimics the function of biological sight – can run at the equivalent of 10,000 images per second at VGA resolution, with high dynamic range and excellent power efficiency. Camera maker Imago Technologies has integrated Prophesee’s Metavision sensor inside its VisionCam EB smart camera. Each pixel in the Metavision sensor is
independent and asynchronous, adjusting at the pixel level according to the dynamic and the light in the scene – each pixel supplies its co-ordinates and a time stamp. If part of the scene is static – like the floor in an industrial setting – no information will be recorded. Slow changes in the scene will be sampled slowly; if something fast happens, the pixel will react quickly. Speaking to Imaging and Machine Vision
Europe, Luca Verre, co-founder and CEO of Prophesee, said that the amount of data the sensor produces is orders of magnitude lower than a traditional frame-based sensor, because it is only recording dynamic events. It means that high-speed counting, for example, operating at thousands of frames per second, can be run on a mobile system- on-chip, such as a Snapdragon 845. Carsten Strampe, general manager
A BMW test vehicle equipped with WheelWatch
www.imveurope.com | @imveurope
of Imago Technologies, noted that, using event-based cameras, high-speed applications can be rethought. ‘Tere are ideas for fast counting of objects, vibration analysis and the control of kinematic movements. But also surface inspection, the measurement of object velocities or the analysis of particles in
liquids is part of the application spectrum,’ he said. Measuring machine vibration frequency
and amplitude in real time can give an indication of when a machine might be about to fail, for example. Prophesee is exploring ways of inspecting mobile phone screens for surface damage, by vibrating the phone and measuring how light is scattered from the surface. Light will reflect differently depending on whether the phone is scratched, or flat and undamaged. Imago’s VisionCam EB makes all the
calculations inside the camera on a dual- core Arm Cortex-A15 processor. A stream of events arrives and is processed into information with the help of Prophesee’s Metavision software library. Swiss firm, Inivation, also supplies
event-based vision technology through its Dynamic Vision Platform, which operates along broadly similar principles. Event-based imaging has been known
in academia for a number of years, but Prophesee’s standard packaged sensor, along with other neuromorphic vision systems, are a new way of inspecting very fast events. O
DECEMBER 2019/JANUARY 2020 IMAGING AND MACHINE VISION EUROPE 17
Mikrotron
Mikrotron
Mikrotron
Page 1 |
Page 2 |
Page 3 |
Page 4 |
Page 5 |
Page 6 |
Page 7 |
Page 8 |
Page 9 |
Page 10 |
Page 11 |
Page 12 |
Page 13 |
Page 14 |
Page 15 |
Page 16 |
Page 17 |
Page 18 |
Page 19 |
Page 20 |
Page 21 |
Page 22 |
Page 23 |
Page 24 |
Page 25 |
Page 26 |
Page 27 |
Page 28 |
Page 29 |
Page 30 |
Page 31 |
Page 32 |
Page 33 |
Page 34 |
Page 35 |
Page 36 |
Page 37 |
Page 38 |
Page 39 |
Page 40
