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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