Hi,
I am new to Tesseract. I searched for an OCR library, found Tesseract and
now I want to use it for a specific measure protocol.
I built Tesseract 5.3.2 from source and the dependencies leptonica-1.83,
libpng and OpenJPEG for Windows with the Latex Visual C++ compiler for
Windows, x64.
Then I did some first tests based on the examples from the documentation (
*Basic_example
*and *SetRectangle_example*). As data set I use *eng.traineddata* from the
*testdata_best* repo.
Now, I have a behaviour which I can't classify. I tried to recognize a
float value in a given rectangle (with *SetRectangle * ). Tesseract didn't
converted it (empty return). Then I manually copied the rectangle and saved
it in a new file (see attached Single_Number.png). Then I tried this file
without the *SetRectangle *call*. *Now it works.
The attached* Protocol_table.png *is the original image, but I removed all
other stuff in the picture. So it's empty except the number at the original
position. Now I have the following behaviour: in DEBUG mode the conversion
works, in RELEASE mode not.
I also tried to slighty enlarge the rectangle area (see last SetRectangle
call in the code below). But now I got a runtime exception. The resolution
of the picture is 2625x1682. So there should be no buffer overflow?!
Am I doning something wrong here? Or what's the problem for this behaviour?
This is my basic code:
//std includes
#include <iostream>
//tesseract includes
#include "tesseract/baseapi.h"
//Leptonica includes
#include "allheaders.h"
//!
int main()
{
tesseract::TessBaseAPI api;
// Initialize tesseract-ocr with English, without specifying tessdata
path
if (api.Init(nullptr, "eng"))
{
std::cout << "Could not initialize tesseract." << std::endl;
return 1;
}
//
Pix* image =
pixRead("D:/projects/cpp/Tesseract-Test/Protocol_Table.png");
//Pix* image =
pixRead("D:/projects/cpp/Tesseract-Test/Single_Number.png");
api.SetImage(image);
// Restrict recognition to a sub-rectangle of the image
// SetRectangle(left, top, width, height)
api.SetRectangle(807, 1393, 93, 49);
//api.SetRectangle(707, 1293, 193, 149);
// Get OCR result
char* outText = api.GetUTF8Text();
if (outText)
printf("OCR output:\n%s", outText);
// Destroy used object and release memory
api.End();
}
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