Bitmap comparison apparatus and method using an outline mask and

Details Bitmap comparison apparatus and method using an outline mask and Bitmap comparison apparatus and method using an outline mask and

1996-05-31

1998-11-10

Shalwala, Bipin

Image analysis

Pattern recognition

Template matching

382231, 382219, 382221, G06K 968, G06K 974

Patent

active

058356347

ABSTRACT:
A bitmap comparison technique that is able quickly to compare two bitmap images while discounting differences between the images likely due to noise. The bitmap comparison technique includes the operations of: comparing the first and second bitmaps, producing a difference map identifying differing bits between the first and second bitmaps, producing outline masks based on the outlines of the first and second bitmaps, identifying certain very different bits within the difference map that are to be weighted differently from the remaining bits within the difference map based upon the outline mask, and determining a comparison score to indicate the extent to which the first and second images differ by differently weighting the very different bits and the remaining bits. The certain bits are normally weighted to a lesser extent than the remaining bits when determining the comparison score so that the influence of noise in the comparison score is diminished. The above bitmap comparison technique can be implemented in numerous ways, including as an apparatus, a method or as a computer-readable medium.

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