There is no panacea in image processing. These methods work for this particular image, and give an idea about the possible solution, but the thresholding and m

There is no panacea in image processing. These methods work for this particular image, and give an idea about the possible solution, but the thresholding and morphological operations are not scale invariant, and very sensitive to light changes and noise. Any algorithm that can detect rivers in text from any image, acquired by some device, such as mobile phone or a scanner, in any light circumstances, will run hundreds of lines long.