4 ms·
Check out the [SIFT Algorithm](http://en.wikipedia.org/wiki/Scale-invariant_feature_transform http://en.wikipedia.org/wiki/Scale-invariant_feature_transfo...).
by frankus 17y ago
Check out the [SIFT Algorithm](http://en.wikipedia.org/wiki/Scale-invariant_feature_transform http://en.wikipedia.org/wiki/Scale-invariant_feature_transfo...). It's not exactly what you describe but might give you some ideas.