We tested only at 1,024 x 768 On May 5, 7:04 am, "Lutz, Michael" <ml...@nds.com> wrote: > Thank you for the answer, that helped me a lot already. Just one more > question. Have you tested the performance saving also with big images e.g. > 2000 x 2000 pixels or bigger? > > -----Ursprüngliche Nachricht----- > Von: tesseract-ocr@googlegroups.com [mailto:tesseract-ocr@googlegroups.com] > Im Auftrag von patrickq > Gesendet: Donnerstag, 5. Mai 2011 12:58 > An: tesseract-ocr > Betreff: Re: Binary Images using SetImage > > I don't have the answers to your questions but we pass a binary image > to Tesseract like you do, with values set to either 0 or 255. > Tesseract will threshold the image so we experiment with modifying > Tesseract to short-circuit the thresholding for performance reasons - > but then realized the performance saving is minimal in this case and > we are not doing that any longer. > > Patrick > > On May 5, 6:48 am, Mike <ml...@nds.com> wrote: > > > > > Hi again, > > * Binary images of 1 bit per pixel may also be given but they must be > > * byte packed with the MSB of the first byte being the first pixel, > > and a > > * 1 represents WHITE. For binary images set bytes_per_pixel=0. > > This is from function TesseractRect() > > Can I also use this on SetImage()? > > Reason is that I already have a gray scale image (1 byte per pixel) > > but the image only holds 2 values, white (255) and black (0). > > I was wondering if in my case tesseract still converts it to a binary > > image or does it use the grey scale directly. > > If it makes a binary image first can I tell it not to do so or do I > > have call the SetImage function in binary mode? > > And in binary mode will one byte be interpreted as 8 pixels? > > Regards, > > Mike > > -- > You received this message because you are subscribed to the Google > Groups "tesseract-ocr" group. > To post to this group, send email to tesseract-ocr@googlegroups.com > To unsubscribe from this group, send email to > tesseract-ocr+unsubscr...@googlegroups.com > For more options, visit this group > athttp://groups.google.com/group/tesseract-ocr?hl=en > > This message is confidential and intended only for the addressee. If you have > received this message in error, please immediately notify the > postmas...@nds.com and delete it from your system as well as any copies. The > content of e-mails as well as traffic data may be monitored by NDS for > employment and security purposes. > To protect the environment please do not print this e-mail unless necessary. > > An NDS Group Limited company.www.nds.com
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