I now code the image as raw binary image and the error disappear. However, the output is totally wrong. Strangely, if I directly call "tesseract image.tif result -l eng" from command line, the result is correct. Here is my few lines of code:
tesseract::TessBaseAPI api; api.Init(NULL, "eng"); //construct raw image api.SetImage(raw_image, raw_image_width, raw_image_height, 0, char_per_line); char* result = api.GetUTF8Text(); Any comments? On Apr 14, 9:46 am, zl2k <[email protected]> wrote: > I noticed it is in TessBaseAPI::Recognize > > int TessBaseAPI::Recognize(struct ETEXT_STRUCT* monitor) { > //... > if (thresholder_ == NULL || thresholder_->IsEmpty()) { > tprintf("Please call SetImage before attempting recognition."); > return -1; > } > //... > > } > > My input image is coded binary, single char, how may I fix the > thresholder problem? Thanks for help. > > zl2k > > On Apr 14, 9:20 am, zl2k <[email protected]> wrote: > > > > > > > > > I block the Recognize but still get the same error. Other comments? > > > On Apr 14, 5:23 am, Leonardo Gomes <[email protected]> wrote: > > > > I'm a newbie with Tesseract, but I know that api.GetUTF8Text() calls > > > Recognize for you. Try removing the call to Recognize to see what happens. > > > > Cheers, > > > Leo. > > > > On Thu, Apr 14, 2011 at 7:58 AM, zl2k <[email protected]> wrote: > > > > hi, all > > > > > I have composed a Pix image and here are the 4 lines of code to > > > > recognize the input image (I am using tesseract 3.00) > > > > > tesseract::TessBaseAPI api; > > > > // construct pix_image > > > > api.SetImage(pix_image); > > > > api.SetRectangle(0, 0, pixGetWidth(pix_image), > > > > pixGetHeight(pix_image)); > > > > api.Recognize(NULL); > > > > std::string result = api.GetUTF8Text(); > > > > > The code compiles fine but got the following runtime error: > > > > Please call SetImage before attempting recognition.Please call > > > > SetImage before attempting recognition.terminate called after throwing > > > > an instance of 'std::logic_error' > > > > what(): basic_string::_S_construct NULL not valid > > > > Aborted > > > > > Could you give me some hint on how to fix the problem? Thanks for > > > > help. > > > > > zl2k > > > > > -- > > > > 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.
