irfanview software (windows) has feature to increase/decrease the dpi resolution. I hope it will help.
On Fri, Aug 19, 2011 at 12:58 AM, Dmitri Silaev <[email protected]>wrote: > The major issue with your images is uneven illumination. You'll need > to pre-process images in order to correct illumination. Another > approach is to try to do the adaptive binarization (Sauvola, Niblack) > and feed Tess with black and white images, since Tesseract internally > uses a global binarization method (Otsu) and cannot cope with uneven > illumination. Having said this, the font seems to be OK for > recognition without any extra training. > > Warm regards, > Dmitri Silaev > www.CustomOCR.com > > > > > > On Thu, Aug 18, 2011 at 12:09 AM, 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. > > > > -- > > 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 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 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
