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Old 18-12-2016, 11:20 AM
gary
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Engineering CMOS image sensors to improve speed and image quality

Katherine Bourzac, in a 16th December 2016 article in the Institute of
Electrical and Electronic Engineers (IEEE) Spectrum magazine, reports -

Quote:
Originally Posted by Katherine Bourzac, IEEE
If you want to capture a super-slo-mo film of the nanosecond dynamics of a bullet impact, or see a football replay in fanatical detail and rich color, researchers are working on an image sensor for you. Last week at the IEEE International Electron Devices Meeting in San Francisco, two groups reported CMOS image sensors that rely on new ways of integrating pixels and memory cells to improve speed and image quality.

Both groups are working on improving global-shutter image sensors.
Quote:
Originally Posted by Katherine Bourzac, IEEE
By focusing on the design of a custom memory bank, Kuroda’s group has developed a CMOS image sensor that can take one million frames per second for a relatively long recording time—480 microseconds at full resolution—compared to previous ultrahigh speed image sensors.
Quote:
Originally Posted by Katherine Bourzac, IEEE
In the Canon chip, each pixel in the 4046 by 2496 array has its own built in charge-based memory cell. They’ve used an engineering trick to improve the image quality by effectively increasing the exposure time within each frame. Typically, the image sensor dumps its bucket of electrons into the memory cell once per frame. This transfer is called an accumulation. The Canon pixels can do as many as four accumulations per frame, emptying their charges into the associated memory cell four times. This improves the saturation and dynamic range of the images relative to previous global shutter CMOS devices operating around the same frame rates. At 30 frames per second, the sensor maintains a dynamic range of 92 dB.

Article here -
http://spectrum.ieee.org/tech-talk/s...mes-per-second
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Old 18-12-2016, 11:43 AM
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Lucky imaging at a million frames a second would be cool if we can get read noise down to negligible levels Thanks for the update, Gary.
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Old 26-01-2017, 02:47 PM
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480 memory cells for each pixel will probably take some considerable space on the chip and thus possibly lower its sensitivity. Interesting developments nonetheless. I really like the 92dB dynamic range at 30 frames per second in the Canon chip!
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Old 26-01-2017, 03:00 PM
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Merlin66 (Ken)
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Whoooo!
With that speed you could have a spectroheliograph image the whole solar surface in 0.0005 second!
Not sure even my new super fast MSI computer could handle that frame rate!
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