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Description
Sometimes while camera preview is open, Barcode Api detects non barcode items as barcode and returns random barcode number( detects barcode by itself without seeing any barcode image).
If you want to test this behaviour keep the camera 10 to 15 cm above the left side of MacBook Pro keyboard it detects keyboard as barcode continuously(Scan following image of keyboard to see the bug ,regardless of orientation it detects image as barcode).
This does not happen in other SDK like Scandit, i-nigma or Manatee . Just Vision Api detects wrongly; increasing preview resolution increases detection error.
here is my createcamerasource method in barcodecapture activity class :
@SuppressLint("InlinedApi")
private void createCameraSource(boolean autoFocus) {
Context context = getApplicationContext();
BarcodeDetector barcodeDetector = new BarcodeDetector.Builder(context).setBarcodeFormats(Barcode.EAN_13 | Barcode.EAN_8 | Barcode.UPC_A).build();
this.mScanFeedback = new ScanFeedback(this);
mScanFeedback.setBeepEnabled(true);
barcodeDetector.setProcessor(new Detector.Processor<Barcode>() {
@Override
public void receiveDetections(Detector.Detections<Barcode> detections) {
SparseArray<Barcode> barcodes = detections.getDetectedItems();
if (barcodes != null && (barcodes.size() > 0)) {
String barcode =barcodes.valueAt(0).displayValue;
if (!barcode.isEmpty()) {
showBarcode(barcode);
}
}
}
@Override
public void release() {
}
});
if (!barcodeDetector.isOperational()) {
Toast.makeText(context, R.string.barcodeOperationalErr, Toast.LENGTH_SHORT).show();
IntentFilter lowstorageFilter = new IntentFilter(Intent.ACTION_DEVICE_STORAGE_LOW);
boolean hasLowStorage = registerReceiver(null, lowstorageFilter) != null;
if (hasLowStorage) {
Toast.makeText(this, R.string.lowStorageErr, Toast.LENGTH_LONG).show();
}
}
CameraSource.Builder builder = new CameraSource.Builder(getApplicationContext(), barcodeDetector).setRequestedPreviewSize(2560, 1440)
.setFacing(CameraSource.CAMERA_FACING_BACK);
if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.ICE_CREAM_SANDWICH) {
builder = builder.setFocusMode(
autoFocus ? Camera.Parameters.FOCUS_MODE_CONTINUOUS_PICTURE : null);
}
mCameraSource = builder
.setFlashMode(Camera.Parameters.FLASH_MODE_OFF)
.build();
flashBtn.setOnCheckedChangeListener(new CompoundButton.OnCheckedChangeListener() {
@Override
public void onCheckedChanged(CompoundButton compoundButton, boolean b) {
if (b) {
mCameraSource.setFlashMode(Camera.Parameters.FLASH_MODE_TORCH);
} else {
mCameraSource.setFlashMode(Camera.Parameters.FLASH_MODE_OFF);
}
}
});
}