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Good evening, I'm thinking about a good way to compare images of characters with a metric.

Infos: Image colors - black/white; one may think of it as a matrix with a value from 0 to 255 for each pixel Image structure - contains in most cases 1, but it may contain some more characters (up to 5) Image sizes - unluckily very different (i. e. matrices have different sizes; between around 3x3 up to 90x25)

I've looked into these two articles, but they don't give me any idea.

Are there any good "conceptual distances" for comparing two images?

What distance metric can I use for comparing images?

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