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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