On Mon, Mar 28, 2011 at 11:54 AM, Lutz, Michael <[email protected]> wrote:
> Hi All, > > So the image Richard gave us is a compressed TIF file. Since tesseract only > supports uncompressed TIF images as noticed by Zdenko you will not get any > results from this image. > Incorrect: 1. image support is task of leptonica, so list of supported format can be found of leptonica web and source code. I think we really need to distinguish this, because with upgrading of leptonica there could be support for new format without changing a line in tesseract code. 2. I guessed that leptonica has problem with tiff with "lzw compression". When I created tiff with "zip compression" it worked (there are also other compression algorithms available in tiff: Packbits, G4, G3,...). I never said that leptonica (tesseract) support only uncompressed tiff. I am sorry if I was not clear about this. 3. As TP corrected me: problem is not in LZW compression, but in "Samples per Pixel". Leptonica support 1, 3, 4. Input image used (unsupported) 2. To "solve" this just open input file in InfranView and save it as tiff with lzw compression. It will change "Samples/Pixel" to 1 automatically ;-) Zdenko I attached the image as an uncompressed TIF file, see uncompressed.zip, this > image is processed by tesseract without any problems. > Also attached is a tesseract.zip, which should unpack a > tesseract.executable, just rename it to tesseract.exe if it went through, it > is a release static build using Win7 and WinSDK 7.1 if anyone still wants > it. > > Regards, > Mike > > -----Ursprüngliche Nachricht----- > Von: Dmitri Silaev [mailto:[email protected]] > Gesendet: Samstag, 26. März 2011 22:04 > An: [email protected] > Cc: zdenko podobny; Lutz, Michael; Richard Genthner > Betreff: Re: tesseract.exe has stopped working on win2008 r2 > > Guys, I still can't understand what the error is produced by > Tesseract. Let's wait for the error screenshot. Or did you understand > everything already? Richard says he's got an error message... > > Warm regards, > Dmitri Silaev > > > > > > On Sat, Mar 26, 2011 at 5:42 PM, zdenko podobny <[email protected]> wrote: > > > > > > On Fri, Mar 25, 2011 at 5:40 PM, Lutz, Michael <[email protected]> wrote: > >> > >> Hi, > >> > >> I just ran your tif file, I get no results, it must have something to do > >> with the size of the image. If I try to run a portion of tiff something > >> smaller than 1000x1000 then I get results. > >> > >> Can somebody explain why a tif size (2480x3508 @ 8BPP) is not processed? > > > > This is not tesseract but leptonica issue (library used for image > handling). > > When I run it on linux I got error message comming from leptonica (1.67 > -> I > > did not try 1.68 on linux yet): > > Error in pixReadFromTiffStream: spp not in set {1,3,4} > > Error in pixReadStreamTiff: pix not read > > Error in pixReadTiff: pix not read > > On Windows leptonica "release version" library did not show error/warning > > messages because of compile option "NO_CONSOLE_IO" > > (see http://code.google.com/p/leptonica/issues/detail?id=42). > > It looks like leptonica did not support lzw compression for tiff ( > > see http://www.leptonica.com/source/README.html "9. Image I/O" - lzw is > > mentioned in png and gif section, but not with tif). I change > > tif compression from lzw to zip (BTW: this will cause smaller image), > > tesseract will produce ouput (on XP SP3). > > Zdenko > > > >> Mike > >> > >> > >> > >> Von: Richard Genthner [mailto:[email protected]] > >> Gesendet: Freitag, 25. März 2011 17:04 > >> An: Lutz, Michael > >> Cc: [email protected] > >> > >> Betreff: Re: tesseract.exe has stopped working on win2008 r2 > >> > >> > >> > >> Here is the screenshot and the tif file. Dmitri if you rename the .exe > >> that should work. I'm trying to get the traning data up. > >> > >> ________________________________ > >> This message is confidential and intended only for the addressee. If you > >> have received this message in error, please immediately notify the > >> [email protected] and delete it from your system as well as any > copies. 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