Saturday, November 10, 2018

Pyxalis Presents GS HDR Sensor

Pyxalis seems to expand its activity beyond custom image sensors to standard products. At the Vision Show in Stuttgart, Germany, the company presented a flyer of its Robin chips with 3.2um global shutter pixels, said to provide "artifact-free in-pixel HDR." The new sensor outputs ASIL data per frame, suitable for automotive applications:


Thanks to AB for the photo from Pyxalis booth!

14 comments:

  1. multiple exposure but claimed to be artefact free

    so whose sensor is this now, STM or Pyxalis?

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    1. The STM one has rolling shutter, while Pyxalis has GS.

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    2. 3.2um pixel? Sounds like the same pixel as the cmosis one?

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    3. STM presented exactly the same sensor at autosens, most definitely GS. Multiple exposure is not artefact free.

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    4. @ Multiple exposure is not artefact free.

      Depends on how they make the short and long exposures. If they are just sequential, one after another, you are right. But if they divide each exposure into smaller parts and interleave them, they can eliminate most of the motion artifacts and, possibly, most of the LED flicker.

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    5. Albert Theuwissen - Harvest ImagingNovember 11, 2018 at 1:53 PM

      Vladimir you are right, this is what is called "chopped exposure".

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    6. Isn't "chopped exposure" patented by others already?

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    7. chopped exposure is not going to work in pipelined global shutter mode. chopping very short exposures would also be very difficult.
      the STM presentation suggested two adjacent exposures.
      chopped integration is owned by others than pyxalis.

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    8. for example the sony pregius g2 have a multiple exposure mode where a pwm pulse defines exposure/pause. i think they use the charge based storage to accumulate the multiple exposure segments?

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    9. What is Sony G2 pwm possible frequency and ratio?

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    10. the min exposure is in the 15us range. min pause has to be longer, i think 10 line times or so, also a bit different for different models. but with imx250 i think you can reach about 100us, 10khz. i tested it, works great. fascinating how this can be realized. what is the principle of this feature? ccd style storage node?

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  2. A Pyxalis employee told me that this sensor supports Active Imaging mode (this means that the detector can work at very short exposures). He also said that HDR mode is implemented in one frame.

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  3. It is not a secret anymore: The HDR is done by two storage nodes in the pixel. After reset, the short exposure time is active. When the period ends, the value is stored in the first node. Then, long exposure is active and after end of that exposure, the charge transfer into the second node is done. One capture, with result of two values from two phases out of one exposure.

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    1. Could be. If true, how do you explain their claim of having no artifacts? Does it mean "no artifacts as long as the scene and the illumination are static?"

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