I checked in FreeOCR(which has tess 3.01 alpha) and found to be in order with few minor mistakes. With help of Irfanview - increased to 300dpi from 72dpi and saved as tif file(uncompressed) and tested. What zdenko says is correct. -sriranga(78yrs)
On Fri, Feb 18, 2011 at 9:27 PM, zdenko podobny <[email protected]> wrote: > Hi, > > Just a quick reply: > I tried it on Windows XP with tesseract 3.00 and it produced bad result > (nothing usefull). > > InfranView informations dialog showed that image has resolution 72x72 DPI > -> to low... > So I resampled it (with Lanczos algorithm) from 100% to 300% size, set DPI > to 300 and decreased number of color to 16 (in InfranView because I have no > time to play with ImageMagick's options ;-) )... > Than OCR result was much more better with several mistakes (just quick > check)... > > So with several image improvements you can get good OCR result. > > BR, > > Zd. > > > On Fri, Feb 18, 2011 at 3:53 PM, Bob Kuo <[email protected]> wrote: > >> Hello all >> >> Please forgive the newbie question. I've seen this posted several >> times before, and I thought I had the right solution but apparently >> not. Attached is a PNG that I'd like to run through tesseract. I >> used ImageMagick's convert to change it into a tiff: >> >> convert -density 200 -units PixelsPerInch test_page.png -type >> Grayscale +compress test_input.tif >> >> (I've also tried to do this at -density 300 with the same results) >> >> The resulting TIF is attached. When I run it through tesseract I get >> an output file that is one byte and is basically blank. Command and >> output below. >> >> tesseract test_input.tif output -l eng >> Tesseract Open Source OCR Engine >> Image has 8 * 1 bits per pixel, and size (375,350) >> Resolution=200 >> >> I saw some other threads about a similar problem, but the solutions >> were to scale it to 200 or 300 DPI, make sure it was in grayscale, >> remove the alpha layer, and somewhere else it said it was fixed in >> Tesseract 2.04. I'm using Tesseract 2.04 on Mac OS X 10.6.6 and >> ImageMagick 6.6.7-1. Is my image just unsuitable for OCR-ing? >> >> I appreciate any help. >> >> Thanks, >> >> Bob >> >> -- >> 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.
