Re: Bayer filter removal

[A complimentary Cc of this posting was sent to
ASAAR
<caught@xxxxxx>], who wrote in article <pir523dn2lkd71hn0i9u5n00edp94lr70u@xxxxxxx>:
Charles Schuler posted an informative link in this thread a couple
of days ago that may clarify the amount of attenuation that takes
place if the Bayer Filter Transmission vs. Quantum Efficiency chart
(Figure 4) is a fair representation. It shows fairly broad filters
with a good deal of overlap, and quantum efficiencies at different
frequencies ranging from about 8% to 38%, maybe averaging a little
bit more than 20%.

If you mean

http://micro.magnet.fsu.edu/primer/digitalimaging/cmosimagesensors.html

I do not see any QE spectral data on Figure 4. So what do you mean?

To find the effect of removing of Bayer, one needs to average these
curves with the coefficient given by the QE curve (well, it must take
into account the IR filter too). In principle, one could try to guess
the QE curve by dividing the "throughput" measured QE of
IRF+Bayer+Sensor by the data for the Bayer.

[Do not have the link for the measured QE at hand, but it was you who
gave it to me. ;-]

Hope this helps,
Ilya

P.S. Let me reiterate that my estimates of "throughput" QE of a 2005's
Canon's sensor (with sunlit scenes) were about 14%.
.

Relevant Pages

  • Re: Cassini: where are colors and detail?
    ... While one filter response may be dropping as you change ... Algorithms in consumer cameras for interpreting Bayer sensors also go ... have to do spectrometry using a Bayer filtered CCD as the sensor. ...
    (sci.astro.amateur)
  • Re: Sharper black and white digital pics
    ... the problem is Bayer sensors are inherently colour ... devices due to the inbuilt RGB filters making the pixels sensitive to only ... filter can be removed (unlike the Bayer filter this is often separate to ... the sensor itself), you should be able to treat the camera as an inherently ...
    (rec.photo.digital)
  • Re: Cassini: where are colors and detail?
    ... While one filter response may be dropping as you change ... > monochromatic light with classic Bayer filter arrays. ... You confuse cheap consumer digital camera problems with bayer sensor ...
    (sci.astro.amateur)
  • Bayer mosaic filter array question
    ... The figures in most documentation, that depicts the Bayer filter array, ... green light to heat and pass red and blue. ...
    (rec.photo.digital)
  • Re: Any thoughts /news on Foveon sensors?
    ... > filter it continues to deliver detail past Nyquist. ... it shows patterns in the image with fewer lines than the test chart ... >> than Bayer sensors for monochrome test ... All Foveon gives you is the ability to handle images ...
    (rec.photo.digital)