val bitmap: Bitmap = MediaStore.Images.Media.getBitmap(contentResolver, imageUri) //deprecated
val detector: QrCodeDetector<GrayU8> = FactoryFiducial.qrcode(null, GrayU8::class.java)
val gray = GrayU8(1, 1)
ConvertBitmap.bitmapToGray(bitmap, gray, null)
detector.process(gray)
if (detector.detections.isNotEmpty())
proceedQrCode(detector.detections[0].message)