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Associated Character Segmentation in OpenCV

What is a good method for segmenting characters that are combined, as in the following figure, knowing that:

  • characters have this font, but font size depends on image size
  • only isolated groups of characters from the image are connected

enter image description here

Also, how can I determine if there are two or more letters that are bound in a given bounding box?

I tried with checking width> height to detect connected characters, but this does not work for blue groups in the image.

I also tried a segmentation method based on: Section 3.4 of the article to separate characters that have received poor results.

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