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R3 NR analysis

Started Jan 21, 2022 | Discussions thread
J A C S
OP J A C S Forum Pro • Posts: 20,521
More about high ISO
1

Here is more info about the highest ISO: 102K. I removed the masked pixels and computed the power spectrum of each row, then averaged (in quadratures) over all rows. Then the same for the columns. I tried G1, G2, R - the results look the same. What I post before is about the R channel.

The row pols may look dramatic, but they deviate from their mean by plus/minus 0.1 (on a log_2 scale), which is nothing.

|FFT| of the columns in average, on a log scale, centered about its mean, BLACK FRAME

Same but done over rows

Now, with a signal at 7 stops below saturation (see the OP). It looks like dark gray.

Columns, GRAY FRAME. Not that much different than the black frame but some of the wrinkles are suppressed.

Rows, GRAY FRAME. More or less like a black frame.

ISO 51K looks the same.

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