I would like some advice concerning the general use of tesseract, because my experience with it tends to two extremes: either tesseract performs flawlessly, with no prior modification of the image necessary except cropping to the text and (most significant) enlarging the image by a factor of 2 or 4; or tesseract's output is riddled with errors.
Following advice to improve the quality of the image (Fred's textcleaner script, or applying the Imagemagick functions it uses individually), usually produces significant improvement in *human readability* of the image, but as regards tesseract they usually produce no improvement, and most often actual deterioration in its performance. So I am looking for another reason to explain tesseract's difficulty with certain images. I thought perhaps its performance may be dependent on its trying to identify the particular font used, but https://github.com/tesseract-ocr/docs/blob/master/tesseracticdar2007.pdf seems to say not. The only other possibility I can think of is either the size or the aspect ratio of the text in the image has been subtly deformed. If so, it is not apparent to my eye, but certainly tesseract is very sensitive to size change, because, when it works, resizing the image makes such a dramatic improvement. Does anyone have other suggestions as to the nature of the problem? I'm not asking for detailed advice here, which is why I've given no image samples, but for general lines of attack, strategy rather than tactics. Thank you. -- 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]. To post to this group, send email to [email protected]. Visit this group at https://groups.google.com/group/tesseract-ocr. To view this discussion on the web visit https://groups.google.com/d/msgid/tesseract-ocr/15dcee7c-0815-47c3-9c74-29f8e90a7ca2%40googlegroups.com. For more options, visit https://groups.google.com/d/optout.
