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: [email protected] [mailto:[email protected]] 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 <[email protected]> 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 [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 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. 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 -- 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
