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Image segmentation OCR

Hello, I' m new in Opencv programing and image processing.

I 'm trying to segment an image containing the front page of a newspaper. I would like to retrieve only the head titles in order to apply OCR tesseract. I have already tried MSER blob detection, Stroke Width Transform and Robust Text detection with poor results:

http://web.stanford.edu/~hchen2/papers/ICIP2011_RobustTextDetection.pdf http://research.microsoft.com/pubs/149305/1509.pdf

I m using Opencv and Python. What would be a possible image processing pipeline for detecting text regions containing a font size of 20 or 25?

Thank you for your advice and help.