https://github.com/tesseract-ocr/tesseract/issues/845
Zdenko
št 14. 9. 2023 o 16:49 Gilad Pellaeon <ld.pella...@gmail.com> napísal(a):
> 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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