QR code detector

[aidenmurphy89]

Can you please have a look at the below code and see if there are any reasons why this would not detect a QR code when a photo is taken? for the detectAndDecode method it returns an empty string and detect method it returns 0.

RCT_EXPORT_METHOD(checkForQRCode:(NSString )imageAsBase64) {
RCTLog(@"%@", imageAsBase64);
UIImage image = [self decodeBase64ToImage:imageAsBase64];

cv::QRCodeDetector qrDecoder = cv::QRCodeDetector();

BOOL isQRPresentResult = [self isQRPresent:image];

NSString *decodedQrData = [self decodeQRCode:image];
//BOOL isQRPresentResult = 1;

//std::string data = qrDecoder.detectAndDecode(matImage);
//std::string data = "testing";

//NSString* result = [NSString stringWithUTF8String:data.c_str()];
//NSString* result = @"test";
RCTLogInfo(@"Pretending to create an event %@", decodedQrData);
RCTLog(isQRPresentResult ? @"yes" : @"No");
};

-(BOOL)isQRPresent:(UIImage*)image{

cv::Mat matImage = [self convertUIImageToCVMat:image];
cv::Mat matImageGrey;
// converting image's color space (RGB) to grayscale
cv::cvtColor(matImage, matImageGrey, cv::COLOR_BGRA2GRAY);
std::vectorcv::Point points;

cv::QRCodeDetector qrDecoder = cv::QRCodeDetector();
return qrDecoder.detect(matImageGrey, points);

};
-(NSString*)decodeQRCode:(UIImage*)image{

cv::Mat matImage = [self convertUIImageToCVMat:image];
cv::Mat matImageGrey;
// converting image's color space (RGB) to grayscale
cv::cvtColor(matImage, matImageGrey, cv::COLOR_BGRA2GRAY);

cv::QRCodeDetector qrDecoder = cv::QRCodeDetector();
std::string qrData;
qrData = qrDecoder.detectAndDecode(matImageGrey);
return [NSString stringWithUTF8String:qrData.c_str()];

};

• (cv::Mat)convertUIImageToCVMat:(UIImage *)image {
  CGColorSpaceRef colorSpace = CGImageGetColorSpace(image.CGImage);
  CGFloat cols = image.size.width;
  CGFloat rows = image.size.height;

  cv::Mat cvMat(rows, cols, CV_8UC4); // 8 bits per component, 4 channels (color channels + alpha)

  CGContextRef contextRef = CGBitmapContextCreate(cvMat.data, // Pointer to data
  cols, // Width of bitmap
  rows, // Height of bitmap
  8, // Bits per component
  cvMat.step[0], // Bytes per row
  colorSpace, // Colorspace
  kCGImageAlphaNoneSkipLast |
  kCGBitmapByteOrderDefault); // Bitmap info flags

  CGContextDrawImage(contextRef, CGRectMake(0, 0, cols, rows), image.CGImage);
  CGContextRelease(contextRef);

  return cvMat;
  };

• (UIImage *)decodeBase64ToImage:(NSString *)strEncodeData {
  NSData *data = [[NSData alloc]initWithBase64EncodedString:strEncodeData options:NSDataBase64DecodingIgnoreUnknownCharacters];
  return [UIImage imageWithData:data];
  };