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will use the same matching measure as the rest of the code.

feature extractor into the scanner.  Fixed this problem.

given only a poly_image type.

part of the image wasn't just zero padding along the border.

allow you to adjust the width and height independently.

of spatially_filter_image_separable() that does downsampling at the same time
as it does the filtering.

doesn't need to be the same size on all sides of a rectangle.

results to an output image rather than overwrite the contents
of the output image.

normalization constant was being computed incorrectly.

a new function called sum_filter().