Friday, September 29, 2017

Canon on Large Pixel Design Challenges

Canon whitepaper "Advances in CMOS Image Sensors and Associated Processing" by Shin Kikuchi, Daisuke Kobayashi, Hitoshi Yasuda, Hajime Ueno, and Laurence Thorpe, first presented at the Hollywood Professional Alliance (HPA) Tech Retreat in Palm Springs on February 19, 2016 talks about challenges in 19um large pixel design (note a strange definition of conversion gain, probably meant to be image lag):

The image sensor design sought optimization of three key attributes of the photosite:
1. Sensitivity – determined by the quantum efficiency of the photosite
2. Saturated charge quantity (sometimes termed full well capacity) – that determines dynamic range
3. Efficiency of the charge transfer (sometimes termed conversion gain) – the goal being to transfer all electrons during each reset period to ensure full sensitivity

Canon says it was able to achieve 70% QE at 500nm in monochrome sensor.


The continuation of the whitepaper, mostly about extended DR and dual pixel is available here.
Posted by Vladimir Koifman at 15:10

8 comments:

  1. RobOctober 1, 2017 at 5:03 PM

    The first link is blocked. All I could find is this: http://webcache.googleusercontent.com/search?q=cache:N1TdGs_oy6YJ:downloads.canon.com/sensors/Canon-White-Paper-19um-High-Sensivity-CMOS-Sensor.pdf+&cd=2&hl=en&ct=clnk&gl=ca .

    Part 2's Link is still working.

    ReplyDelete
    Replies
    1. Vladimir KoifmanOctober 1, 2017 at 5:07 PM

      The link is working fine for me. I'd guess the problem is somewhere on your side.

      Delete
    2. rgutalvOctober 2, 2017 at 11:15 AM

      Hello Vladimir, I think that the problem is that the link is generated for you

      Referral Denied

      You don't have permission to access "http://downloads.canon.com/sensors/Canon-White-Paper-19um-High-Sensivity-CMOS-Sensor.pdf" on this server.
      Reference #24.4081002.1506932038.23d5a3d9

      Delete
    3. Vladimir KoifmanOctober 2, 2017 at 11:24 AM

      OK. But the file sill opens when I try it in Chrome incognito window.

      Delete
    4. Vladimir KoifmanOctober 2, 2017 at 11:30 AM

      One can see the link to whitepaper also at the bottom of Canon's image sensor products page:

      https://www.usa.canon.com/internet/portal/us/home/explore/product-showcases/sensors/

      Delete
  2. DavidOctober 2, 2017 at 11:23 AM

    Via google: http://learn.usa.canon.com/app/pdfs/white_papers/White_Paper_AdvancesinCMOS.pdf

    ReplyDelete
  3. DavidOctober 2, 2017 at 11:24 AM

    oops, sorry, that was the same as your second link, remove the comment.

    ReplyDelete
  4. Andrey KuznetsovOctober 3, 2017 at 8:35 PM

    The denied referral means that Canon does not want other sites to link back to that document. Access is only blocked if you click on the link from this blog post, you can circumvent passing the referral to canon's website by copying the link and pasting it into the address bar of a new tab in your browser, or open the link in Incognito mode, that strips the referral information passed to canon website.

    ReplyDelete

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