Dmitri, you are correct, this function only set the bounding box of ,em, not exactly CCs. if the character has a closed curve in it, the inner area is returned as an outline. for example [this] <http://i49.tinypic.com/dh35sx.png>. I've shown the result of the "extract_edges" in green lines.
On Saturday, June 23, 2012 1:40:48 PM UTC+4:30, Dmitri Silaev wrote: > > block_edges() has nothing to do with edge detection. Tesseract does > not use it at all. It first binarizes entire images then extracts > connected components (CCs). block_edges() is called to extract CCs' > outlines from a binarized image. > > Warm regards, > Dmitri Silaev > www.CustomOCR.com > > > On Sat, Jun 23, 2012 at 10:43 AM, shahin youssefi > <[email protected]> wrote: > > Hello dear friends, > > I wonder if anybody knows what edge detection algorithm does > > tesseract 3.01 utilize when finding connected components? > > More specifically in edgblob.cpp file there is a function called > > "extract_edges" in which a function named "block_edges" is called > > which is responsible to extract edges and find the outline of a block. > > Correct me if I'm wrong but it seems that "block_edges" doesn't use > > famous edge-detection methods like Canny, Sobel or Prewitt. > > Thanks in advance. > > > > -- > > You received this message because you are subscribed to the Google > > Groups "tesseract-ocr" group. > > To post to this group, send email to [email protected] > > To unsubscribe from this group, send email to > > [email protected] > > For more options, visit this group at > > http://groups.google.com/group/tesseract-ocr?hl=en > -- You received this message because you are subscribed to the Google Groups "tesseract-ocr" group. To post to this group, send email to [email protected] To unsubscribe from this group, send email to [email protected] For more options, visit this group at http://groups.google.com/group/tesseract-ocr?hl=en
