Thanks a lot, James, that's what I needed. I'll check your tool! Em terça-feira, 7 de fevereiro de 2017 05:43:30 UTC-2, James R Barlow escreveu: > > Tesseract doesn't deskew the output image. It makes no changes to the > output image. > > What it does try to do is find a local baseline to account for text that > is skewed. I believe it may be capable of finding low order polynomial > baselines as well to account for certain distortions. This is strictly a > tool to improve OCR results. You can see the results in the output of the > "hocr" renderer. > > Example hocr output for a straight line with no skew: > > <span class='ocr_line' id='line_1_1' title="bbox 882 131 1656 217; > baseline 0 -17; x_size 87; x_descenders 17; x_ascenders 21"> > > Interpretation in hocr spec of "baseline": > https://kba.github.io/hocr-spec/1.2/#propdef-baseline > > > You will get better results if you globally deskew and cleanup the image > using other methods such as Leptonica's deskew function. > > OCRmyPDF is a tool I develop that wraps tesseract. It can perform deskew > using Leptonica before it delegates OCR to tesseract. > > > On Sunday, 22 January 2017 15:40:20 UTC-8, Pedro Correia wrote: >> >> Hi there, >> I've been reading Tesseract's code and I've realized that are several >> skew estimation functions around. However I am really confused: does >> Tesseract actually deskew the image? >> Here [1] we find that "The line finding algorithm is designed so that a >> skewed page can be recognized without having to de-skew, thus saving loss >> of image quality." Does it mean that no deskewing is done? >> On the other hand, I've seen some posts around here referring to >> Leptonica's deskewing algorithm, even though I couldn't find any call to >> it's functions anywhere in Tesseract's code. >> So, can anyone explain the real deal to me? >> Thanks in advance! >> >> [1]: >> https://github.com/tesseract-ocr/docs/blob/master/tesseracticdar2007.pdf >> >>
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