Lo siento (sorry) -- Andres and Andriy -- mixed up your names. --Sven On Thu, Aug 18, 2011 at 2:11 PM, Sven Pedersen <[email protected]> wrote: > Hi Andre, > You must have a minimum resolution to be effective, overly high > resolution will also throw results off. Internally the JPG is > converted to a bitmap format. They are currently only 72dpi, so you'll > need to resize (scale) them at least, but the low contrast (black on > gray) will be a problem, so ImageMagick or something could help. > --Sven > > > On Thu, Aug 18, 2011 at 9:39 AM, Andres <[email protected]> wrote: >> Sven: >> What do you exactly mean with 200-300 dpi ? The dpi attributes in the >> jpg files are being evaluated ? Or you are referring to some scaling >> of the images ? >> >> Andriy: >> If you continue having problems with this and if the camera is in a >> fixed position with respect to your display and the font is always the >> same, it should be very easy for you to avoid using tesseract and just >> recognizing the characters by evaluating some pixels after >> thresholding. (I would threshold just the evaluated pixels). >> >> Regards, >> >> Andres >> >> >> >> 2011/8/18 Sven Pedersen <[email protected]>: >>> You should not need to retrain. You need to change the images to >>> grayscale or B&W of 200-300 dpi, get the background (which seems to be >>> gray) to be closer to white. You can do that kind of cleanup >>> transformation with ImageMagick. >>> --Sven >>> >>> >>> On Wed, Aug 17, 2011 at 3:09 PM, Andriy Malovanyy <[email protected]> >>> wrote: >>>> Hi, >>>> >>>> I try to write a simple program that uses pictures, which are taken from a >>>> web-cam every 10 sec. with another program, recognises the text with OCR >>>> and >>>> log the data into a text file. Everything seems to be working fine except >>>> the fact that tesseract does not want to recognize the pictures that are >>>> taken. If I "feed" tesseract pictures created with Photoshop, it works >>>> better but sometimes also can not recognize very simple and obvious text >>>> (numbers). >>>> >>>> I attach the 3 files taken by a web cam and 1 created with Photoshop. None >>>> of them recognize well. The first two web-cam picture return garbage text, >>>> the third one (the best quality I think) returns "Empty page message". >>>> Photoshop picture returns "1234.018" instead of "1234.0.18". >>>> >>>> I use Tesseract-OCR 3.0 with language files that followed the package >>>> (English only). Do I need to train Tessarat to recognise the pictures?? How >>>> is it better to do it then?? Take several pictures taken with a web-cam, >>>> and >>>> from them make a training file with numbers from 0 to 9 and points? I have >>>> started to read how to do that, it seems sooo complicated.. >>>> >>>> Any advice appreciated.
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