Pattern matching provides a fast, general purpose algorithm to locate an object in a image. However, pattern matching is not well suited to applications where the object to be detected is scaled (Figure A) or if more than 10% of the image is occluded (Figure B). Non-uniform lighting (Figure C) of search images can reduce the effectivity of pattern matching. Applications that are likely to encounter these conditions should use Geometric Matching instead.

A

B

C