8000 Wrong patch size in COH^sum algorithm. · Issue #396 · usnistgov/NFIQ2 · GitHub

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Wrong patch size in COH^sum algorithm. #396

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utcke opened this issue Mar 6, 2025 · 0 comments

utcke commented

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6.2.14.4 d states:

For each (16 × 16) pixels local region V in I:

But two lines below this is followed by

NOTE Up to and including in version NFIQ 2.2, V is implemented as a (16 × 16) pixels region.

So presumably this is now 32? What does the code say?

If this is 32x32, we also need to change 3510 to 800 (the maximum number of 32x32 blocks in 800x1000 pixel).

Even better, divide by the actual block-count. As is, this quality value not only measures coherence, but also size.

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