Question

is it possible to get text from images with tesseract asynchronously?
id love to give users to cancel the scanning if it takes much time.

char* utf8Text = tesseract->GetUTF8Text();

locks the screen until OCR finishes.

Answer 1

Running in a background thread will let the user interface continue receiving requests. Try something like this:

dispatch_async(dispatch_get_global_queue(DISPATCH_QUEUE_PRIORITY_DEFAULT, 0), ^{
    char* utf8Text = tesseract->GetUTF8Text();
});