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Canon XL and GL Series DV Camcorders
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Old August 5th, 2004, 05:11 PM   #181
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Andre, if I understand you, that's along the lines I was thinking. Regardless of bit depth of the A/D, Assuming all CCD's and everything else is equal, the brightest white will be the biggest number on each A/D correct? This seems to make perfect sense to me as a programmer, but I'm not up with all the optical stuff.

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Old August 5th, 2004, 06:29 PM   #182
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Andre, I'm not following what your saying. Are you saying 8 bit and 16 bit image files have the same dynamic range?
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Old August 6th, 2004, 04:37 AM   #183
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Yes Jeff. The non adaptive CCD dynamic range is the range between the highest signal level (limited by a certain amount of distortion- "white clip" in video)and the lowest signal level (limitted by a certain amount of unwanted vs wanted signals- noise, glare..in cams ). This figure is seldon higher than 45 db in consumer camcorders. Maybe there is a confusion about how well a scene's dynamic range (80db and more) is being "packed"into the limited camers range. This subjective compression
performance is like I wrote (knee processing, gamma, ..) bitdepth dependent.
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Old August 6th, 2004, 05:45 AM   #184
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Even before processing the 16 bit file would contain more levels of gray (greater dynamic range) that are discernible to the eye than an 8 bit file.
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Old August 6th, 2004, 08:28 AM   #185
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Here http://www.fillfactory.com/htm/techn...df/oeepe99.pdf (PDF) is some info on CCD (and CMOS) dynamic range. IMEC is a Belgian micro electronics research center where I used to be a member of the scientific advisory commitee for several years.
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Old August 6th, 2004, 11:31 AM   #186
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Thanks Andre, I'll look that over after classes this afternoon. You may be interested in Norman Koren site and his discussion on tonality and dynamic range.
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Old August 6th, 2004, 03:23 PM   #187
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Interesting article. Although dynamic range is a well defined ratio, the " hidden dynamic range" approach is a good idea that kinf of explains what I wrote before: using high bitdepths allows manipulating (mainly expand) "hidden" parts in the analog signal.
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