For screen captures it is necessary to increase the resolution, since it is usually 72-90dpi you must rescale them to 200-300dpi, then you'll see a drastic improvement in accuracy. I don't know anything about the C# stuff though... --Sven
On Wed, Jul 6, 2011 at 9:02 AM, Andreas Reiff <[email protected]> wrote: > Hello Quan! > > That did the trick, many thanks! > > By the way, I am using unsafe, because it is in the example > Simple1.cs. > > Apart from that, I would rather not use it, since it propagates up.. > and it doesn't prevent an application from crashing anyway. > > If you find the time, could you answer one more related question: I > want to do screen text recognition, like text on menus, in notepad, > and the like. Your testdata seems to be rather bad for this (now that > it is running, I could test). How best to handle this? Create/get new > testdata? Is it possible to use it without testdata at all? > > I would have expected screen recognition to be especially easy, since > there is no noise. But then again, I have spent too little time to > look into this yet. > > Best wishes, > Andreas > > On 6 Jul., 14:05, Quan Nguyen <[email protected]> wrote: >> Andreas, >> >> Try adding a slash to the data path, such as: >> >> string tessdataFolder = @"D:\Temp\IPoVnOCRer\IPoVn\Test\Tessdata\"; >> >> I'm curious as to why you use unsafe block in your code. >> >> Quan >> >> On Jul 6, 5:01 am, Andreas Reiff <[email protected]> wrote: >> >> >> >> > I get an AccessViolationException, trying to adapt your code for my >> > needs: Attempted to read or write protected memory. This is often an >> > indication that other memory is corrupt. >> >> > The code is more or less copied from your simple1 - my bitmap does not >> > come out of a file but from a screenshot (part of the screen). >> >> > public static void Recognize(Bitmap bmp) >> > { >> > string language = "eng"; >> > int oem = (int)eOcrEngineMode.OEM_DEFAULT; >> >> > using (TesseractProcessor processor = new TesseractProcessor()) >> > { >> > DateTime started = DateTime.Now; >> > DateTime ended = DateTime.Now; >> >> > string tessdataFolder = @"D:\Temp\IPoVnOCRer\IPoVn\Test >> > \Tessdata"; >> >> > processor.Init(tessdataFolder, language, oem); >> >> > string text = ""; >> > unsafe >> > { >> > started = DateTime.Now; >> > text = processor.Recognize(bmp); >> > ended = DateTime.Now; >> >> > Console.WriteLine("Duration recognition: {0} ms\n\n", >> > (ended - started).TotalMilliseconds); >> > } >> >> > Console.WriteLine( >> > string.Format("RecognizeMode: {1}\nRecognized Text:\n{0}\n+ >> > +++++++++++++++++++++++++++++++\n", text, >> > ((eOcrEngineMode)oem).ToString())); >> >> > } >> >> > } >> >> > BTW, thx for writing a wrapper - if it works, it solves just about all >> > my problems. :)- Zitierten Text ausblenden - >> >> - Zitierten Text anzeigen - > > -- > 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 > -- ``All that is gold does not glitter, not all those who wander are lost; the old that is strong does not wither, deep roots are not reached by the frost. >From the ashes a fire shall be woken, a light from the shadows shall spring; renewed shall be blade that was broken, the crownless again shall be king.” -- 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
