• What kind of features are required to distinguish two different patterns of 5 pixels independent of position and orientation? – Do we need to replicate T and C templates across all positions and orientations? – Looking at pairs of pixels will not work – Looking at triples will work if we assume that each input image only contains one object.

Replicate the following two feature detectors in all positions

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If any of these equal their threshold of 2, it’s a C. If not, it’s a T.