cpw

cpw

Lives in United States CA, United States
Joined on Oct 29, 2004
About me:

Cameras Owned:
New era:
Nikon D40
Fujifilm F10
Canon A80
Oldies but goodies:
Canon T70
Canon TLb
Minolta XG1
Minolta 16QT

cpw's recent activity

  • Eric Fossum wrote: Allan Olesen wrote: Eric Fossum wrote: One of my graduate students is looking into this. We are in uncharted territory. But, the device should work fine without any...
  • Anders W wrote: ... While I am glad that you like the idea I introduced in my reply to Joe (Great Bustard) here and presented in greater detail in the OP of the present thread, illustrative...
  • Anders W wrote: ... As already acknowledged, yes, although I'd express it slightly differently: My normed SNR data takes the negative impact of PRNU noise on the SNR into account whereas a QE...
  • Anders W wrote: In a prior thread over on the PST (photographic science and technology) forum, I showed here and here that smaller sensors tend to be more efficient than larger for a number of...
  • Replied in some ideas
    Very cool, Image J is very useful.  Here's some things I can think of that may be worth trying: 1) The data might be improved by taking a dark picture (lens cap on in a dark room), then doing      ...
  • Replied in many thanks
    Eric Fossum wrote: In some thread, I promised that when a final draft of a review paper on the pinned photodiode (used in almost all CMOS image sensors and corresponding DSLRs) was complete, I...
  • Replied in on read noise
    Jimmy K. wrote: Hi Chris, I'm curious how do you make the estimate from Optical Black noise vs ISO plot? Is there another thread or some other data is used? Thanks. Hi Jimmy, I started with...
  • Replied in on read noise
    Iliah Borg wrote: ... How do you explain the shapes of the curve and the differences local only to the certain ISO region? ... Hello Iliah, Thanks for doing these measurements.  Since I don't have...
  • Jack Hogan wrote: The_Suede wrote: Shouldn't (hm) DR really be defined with the total noise sum, in stead of "just" read noise"...? I.e DR = the point where SNR=1, not the point where RN =...
  • Yes hello J.V, it's a good question and always fun to spectulate on.  I think that sensors can be improved by increasing QE and Dynamic Range; and also by reducing the angular sensitivity and...
  • Replied in Nice
    Hello Peter, I like your train of thought, however, to be rigorous if you want to get to Luminance, B, from input Illuminance, E, you have to have the solid angle units of sr in the denominator, so...
  • Yes hi Jack, Yes very seldom for Vis light.  To give you an idea of order of magnitudes involved, continuing along Gerry's thoughts, p. 18 of Janesick's book shows a graph of a quantum yield...
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Last upload Mar 25, 2011