Morphological Reconstruction in OpenCV

Question

When processing an image with text in OpenCV, my opening operation does not result in proper output data. The issue is quite similar to the one described in this article: ht

Answer 1

This answer arrives late, but here is the basic algorithm for under-reconstruction:

1. Inputs are two images: ImReference and ImMarker, with marker <= reference
2. Intermediate image: ImRec
3. Output image: ImResult
4. Copy ImMarker into ImRec
5. copy ImRec into ImResult
6. ImDilated = Dilation(ImResult)
7. ImRec = Minimum(ImDilated, ImReference)
8. If ImRec != ImResult then return to step 5.

It's not the most optimal algorithm, but it uses only basic operations.