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aconz2 · Apr 15, 2026

Normalized Cross Correlation

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I spent some time recently on a tool to OCR images which have been rendered (ie. Print To PDF not photographs) with a known font. I call that tool font-ocr or focr. Some fonts are particularly tricky with the difference between 1 (one) and lowercase l (letter el) like Courier or Courier New. So my approach was to take the known font, render each letter, and compare with the input image. Approach 1…

Read on aconz2.github.com

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