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Text File
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1990-10-13
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319b
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12 lines
* shading correction by subtraction of
* the background.
* background is calculated by maxmin filtering
* source image should be in A, result in B.
*
* calculate the background by
* maxmin filtering
lmax A,B,31 * max filter
lmin B,B,31 * min filter
sub A,B,255 * subtract background