SetPageSegMode and try PSM_SINGLE_BLOCK. See: https://github.com/tesseract-ocr/tesseract/wiki/APIExample#orientation-and-script-detection-osd-example https://github.com/tesseract-ocr/tesseract/blob/master/ccstruct/publictypes.h#L151
Zdenko On Wed, Mar 9, 2016 at 6:45 PM, 'John Taves' via tesseract-ocr < [email protected]> wrote: > I am using the c# API and whatever default page segmentation happens. What > tess variable[1] should I play with? > > [1]http://www.sk-spell.sk.cx/tesseract-ocr-parameters-in-302-version > > jt > > On Wednesday, March 9, 2016 at 8:44:02 AM UTC-8, zdenop wrote: >> >> What page segmentation method[1] you used? >> >> [1] >> https://github.com/tesseract-ocr/tesseract/wiki/ImproveQuality#page-segmentation-method >> >> Zdenko >> >> On Wed, Mar 9, 2016 at 5:14 PM, 'John Taves' via tesseract-ocr < >> [email protected]> wrote: >> >>> I am trying to recognize a flawless image. I created the image from a >>> pdf that is all vector, not image. It has no noise, no skew, flawless >>> characters in any DPI that I want. >>> >>> >>> The recognition from Tesseract sucks. Generally the problem is dropped >>> characters. It seems to randomly ignore perfectly good looking characters. >>> >>> >>> The screen shot shows the text results in the upper left and the image >>> in the background (only the upper left of the image is visible). The >>> bounding boxes of the results are shown in red on that image. Notice all >>> the missing characters. On this particular image all the characters to the >>> right of what you can see are found and recognized properly. The image >>> consists of a table of information (rows of item #, size, description, and >>> qty). The columns are not nicely aligned (although this example is pretty >>> good). Some rows are separated by a line (this example has a line for each >>> row, and notice that tesseract gives me a bounding box for some of the >>> lines, but not all). I tried removing the lines, but that just changed the >>> set of dropped characters with no rhyme or reason to it. Other images from >>> this same set are very similar but tesseract will drop characters on the >>> right, or whole lines will be missing. I have tried different DPI from 75 >>> to 300, but the results were just as disappointing. >>> >>> >>> Can anyone suggest how this might be solved? >>> >>> >>> <https://lh3.googleusercontent.com/-YwT5YW2wYGo/VuBLmZ-_lSI/AAAAAAAAAZ8/FhfW1gGg_8g/s1600/BadOCR.png> >>> >>> >>> <https://lh3.googleusercontent.com/-ER5AgyxXtY4/VuBLtP6wWvI/AAAAAAAAAaA/1Lxb767Xiqs/s1600/foo700219.png> >>> >>> >>> >>> -- >>> 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/8c27aca6-3a45-4c23-97af-676fc6b0b611%40googlegroups.com >>> <https://groups.google.com/d/msgid/tesseract-ocr/8c27aca6-3a45-4c23-97af-676fc6b0b611%40googlegroups.com?utm_medium=email&utm_source=footer> >>> . >>> For more options, visit https://groups.google.com/d/optout. >>> >> >> -- > 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/365df293-c049-418f-8632-9bb64c080d32%40googlegroups.com > <https://groups.google.com/d/msgid/tesseract-ocr/365df293-c049-418f-8632-9bb64c080d32%40googlegroups.com?utm_medium=email&utm_source=footer> > . > > For more options, visit https://groups.google.com/d/optout. > -- 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/CAJbzG8zOCR5FWMCywA%3Dp5KoyGw0g7HNwODTX1a8nouuqsAp9nA%40mail.gmail.com. For more options, visit https://groups.google.com/d/optout.
