'How to encode a grid of 9 gray pixels intensity into a single number?
So I have 9 pixels on a square grid. Each one is 0..255 (a shade of grey image). I want to get a kind of fingerprint out from it. I have 20 possible options, and I want to find the closest to a given image.
- 4 types of center fill,
- 6 types of line fill,
- 2 types of angled fill,
- 4 types of direction fill
- 4 types of cross fill
like this:
So how to get to which one of 20 my current given image is the closest?
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