hi,
im using tesseract on my iPhone app.
i want to stop/cancel the ocr process. is there a way to do it?
i wrote in backPressed method:
tesseract->Clear();
tesseract->End();
but when the ocr starts and i hit the back button, it crashes, cos it is
still OCRing.
here is my iOS code:
- (void)processOcrAt:(UIImage *)image
{
[self setTesseractImage:image];
//char* utf8Text = tesseract->GetUTF8Text();
//[self performSelector:@selector(ocrProcessingFinished:)
withObject:[NSString stringWithUTF8String:utf8Text]];
//dispatch_queue_t queue = dispatch_queue_create("com.awesome", 0);
main = dispatch_get_global_queue(DISPATCH_QUEUE_PRIORITY_DEFAULT, 0);
dispatch_async(main, ^{
tesseract->Recognize(NULL);
char* utf8Text = tesseract->GetUTF8Text();
[self performSelectorOnMainThread:@selector(ocrProcessingFinished:)
withObject:[NSString
stringWithUTF8String:utf8Text]
waitUntilDone:NO];
delete [] utf8Text;
});
}
-(IBAction)backPressed:(id)sender{
dispatch_release(main);
tesseract->Clear();
//tesseract->End();
delete tesseract;
tesseract = nil;
delete pixels;
[self.navigationController popViewControllerAnimated:YES];
}
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