Upps, I' ve found the error the path where is the picture was wrong :$. I
have changed the path and it works now.
El miércoles, 2 de octubre de 2013 09:37:32 UTC+2, adrian company escribió:
>
> Hi everybody,
> I'm new with tesseract and I have created a project to use it and
> recognize characters from a ethernet camera. The problem is when I execute
> the program an error like this:
> *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*
>
> is returned. I' ve tried adding SetImage and the same error is given.
> Anybody knows what is the reason of that error? Any clue?
>
> Thanks in advance.
> I paste the code where I have the problem:
>
> if (waitKey(10) >= 0){
>
> imwrite("/home/adrian/workspace/Snapshots/foto.jpg", image
> ); //take snapshot when key is pressed
> cont=cuenta;
> cont=cont-1;
>
> // read image
> Mat imagen = imread(
> "/home/adrian/workspace/foto.jpg");
>
> // initilize tesseract OCR engine
>
> putenv("TESSDATA_PREFIX=/usr/local/share/");
> setlocale(LC_ALL, "C");
>
> tesseract::TessBaseAPI api;
>
>
> if (api.Init(NULL, "eng")) {
> fprintf( stderr, " Could not intialize
> tesseract!!!!\n" );
> exit(1);
> }
> api.SetImage(imagen.data, imagen.size().width,imagen.size().
> height, imagen.channels(), imagen.step1());
>
>
> // set region of interest (ROI), i.e. regions that
> contain text
> Rect text1ROI(162, 110, 157 , 129);
>
> // recognize text
> api.TesseractRect( imagen.data, 1, imagen.step1(), text1ROI.x,text1ROI
> .y, text1ROI.width, text1ROI.height);
> const char *text1 = api.GetUTF8Text();
>
> // remove "newline"
> string t1(text1);
> t1.erase( std::remove(t1.begin(), t1.end(), '\n'),t1
> .end() );
>
> // print found text
> printf("text: \n");
> printf( "%s",t1.c_str() );
> printf("\n");
>
> // draw text on original image
> Mat scratch = imread(
> "/home/adrian/workspace/OCR/foto.jpg");
>
> int fontFace = FONT_HERSHEY_PLAIN;
> double fontScale = 2;
> int thickness = 2;
>
> putText(scratch, t1, Point(text1ROI.x, text1ROI.y), fontFace,fontScale
> , Scalar(0, 255, 0), thickness, 8);
> rectangle(scratch, text1ROI, Scalar(0, 0, 255),
> 2, 8, 0);
>
> imshow("tesseract-opencv", scratch);
> }
>
>
>
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