Difference between revisions of "Noise Reduction"
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C0 + C1 * exposuretime | C0 + C1 * exposuretime | ||
C0: Constant component of dark frame energy. | |||
If all pixels are read in parallel, the column uniformity might come from temporal variation of thermal noise. | |||
[[File:C0.png | 400px]] | [[File:C0.png | 400px]] | ||
C1: Exposure dependant component of the dark energy. | |||
The row uniformity is probably due to each ADC response. | |||
[[File:C1.png | 400px]] | |||
Revision as of 19:05, 28 February 2015
Record sensor temp alongside raw, apply different noise compensation depending on temp in post.
A Peltier can help build the profiles - by heating and cooling to a range of temperatures as needed.
Fixed Pattern Noise
General explanation: http://en.wikipedia.org/wiki/Fixed-pattern_noise
AXIOM Alpha measurements:
C0 + C1 * exposuretime
C0: Constant component of dark frame energy.
If all pixels are read in parallel, the column uniformity might come from temporal variation of thermal noise.
C1: Exposure dependant component of the dark energy.
The row uniformity is probably due to each ADC response.
