From DXOMark: More pixels offsets noise3

Started May 30, 2009 | Discussions thread
ejmartin Veteran Member • Posts: 6,274
Re: That is what I have seen also

DSPographer wrote:

I did see that if I take a shot with the lens cap on that I can make
a correction using just the sum of the rows and the sum of the
columns that removes the visible pattern noise. The problem I had was
in the amount of masked pixels as you mentioned. I had hoped that the
vertical noise followed a repeating pattern so that a correction
could be formed by something like aggregating every fourth masked
column value but the column data varies too irregularly from column
to column for that.
--

What is the degree of correlation of the average of the masked pixels in a given column/row with the average of the active pixels in that same column/row? If it's over 50% won't you do better by subtracting the masked pixel average from the active pixel data?

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tko
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