Many thanks for the information, Johannes! I have played with *textord_max_noise_size *and it turned out that noise in my particular case is not removed even when I set *textord_max_noise_size=45*. Above that value almost all other characters have been considered as noise.
However *textord_heavy_nr=1* worked well for me. It looks like this very setting works on its own and does not depend on values for other settings mentioned. On 30.05.2013 9:11, Johannes Richter wrote: > The parameter i meant is "*textord_max_noise_size*" and it defines > the maximum size of noise in pixels. You could also try the one you > have found in the list "*textord_heavy_nr*". > > "Opening and Closing Operators" are morphological operators. I > searched Wikipedia fo a nice example, but the english version is only > a stub. > In your case the opening-operation is the way to go. Many image > processing frameworks include morphological operations. If your > software does not provide a opening operator look for *erosion* and > *dilation*.(opening is just a erosion followed by dilation) > > I made a quick example in gimp. > the picture "before.png" shows my object (the circle) with some noise > i want to remove. I executed the erosion operation on this picture > with a proper filter mask. The result is in picture "after > erosion.png". The circle has changed in size (and shape). As last step > i executed the dilation operation in gimp. The resulting image "after > dilation.png" shows only the circle. > > Depending on your objects and noise you need to choose a proper filter > mask for this operations. This operation will change the shape of your > characters slightly. -- With best regards, Dmitry -- -- 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 unsubscribe from this group and stop receiving emails from it, send an email to [email protected]. For more options, visit https://groups.google.com/groups/opt_out.
