Brief explanation
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Stage 1
We start with the source image
STAGE 2
The image is filtered to enhance the contrast between features
Stage 3
Contours are found which we use to detect blobs, it is assumed the puzzle is the largest object in the image. A polygon is fit to the blob, if more than 4 corners exist determine most likely coroners are computed.
STAGE 4
The puzzle is extracted and blob detection is performed once again to identify the cells.
Stage 5
Once the characters are recognised, the orientation of the puzzle can then be determined, the puzzle is solved and the result overlaied
STAGE 6
Done