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your reg object was never initialized.

your reg object was never initialized.initialized. you're lacking code like:

Ptr<OCRTesseract> reg = OCRTesseract::create();

your reg object was never initialized. you're lacking code like:

Ptr<OCRTesseract> Ptr<text::OCRTesseract> reg = OCRTesseract::create();
text::OCRTesseract::create();

please see docs

(then, you probably should not allocate such an object per detection, but only once per runtime)