Рисование ограничивающих коробок на штрих -коде штрих -кода Mlkit ⇐ Android

[Anonymous]

Я работаю над простым сканером штрих -кода, используя Google Mlkit Scanner и API Camerax. Но ограничивающие коробки не опираются на штрих -коды. Я пробовал много вещей, таких как координаты преобразования и т. Д., Но не работал:
Прикрепленные изображения. /> barcodescanneractivity < /p>
public class BarcodeScannerActivity extends AppCompatActivity {

private static final int REQUEST_CAMERA_PERMISSION = 1001;
private ExecutorService cameraExecutor;
private static final String TAG = "BarcodeScannerActivity";

private int currentOrientation = 0; // 0: portrait, 1: landscape

private BarcodeOverlay barcodeOverlay;
private PreviewView previewView;

@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_barcode_scanner);
previewView = findViewById(R.id.previewView);
barcodeOverlay = findViewById(R.id.barcodeOverlay);
if (ContextCompat.checkSelfPermission(this, Manifest.permission.CAMERA)
== PackageManager.PERMISSION_GRANTED) {
startCamera();
} else {
ActivityCompat.requestPermissions(this, new String[]{Manifest.permission.CAMERA}, REQUEST_CAMERA_PERMISSION);
}

cameraExecutor = Executors.newSingleThreadExecutor();

// Set up orientation listener
OrientationEventListener orientationEventListener = new OrientationEventListener(this) {
@Override
public void onOrientationChanged(int orientation) {
// Update orientation state based on the device's orientation
if ((orientation >= 0 && orientation < 45) || (orientation >= 315)) {
currentOrientation = 0; // Portrait
} else if (orientation >= 135 && orientation < 225) {
currentOrientation = 1; // Landscape
}
}
};
orientationEventListener.enable();

}

private void startCamera() {
ListenableFuture
cameraProviderFuture = ProcessCameraProvider.getInstance(this);

cameraProviderFuture.addListener(() -> {
try {
ProcessCameraProvider cameraProvider = cameraProviderFuture.get();
bindCameraUseCases(cameraProvider);
} catch (Exception e) {
Log.e(TAG, "Camera provider failed.", e);
}
}, ContextCompat.getMainExecutor(this));
}

private void bindCameraUseCases(@NonNull ProcessCameraProvider cameraProvider) {
// PreviewView previewView = findViewById(R.id.previewView);

// Camera selector for the back camera
CameraSelector cameraSelector = new CameraSelector.Builder()
.requireLensFacing(CameraSelector.LENS_FACING_BACK)
.build();

// Preview use case
Preview preview = new Preview.Builder().build();
preview.setSurfaceProvider(previewView.getSurfaceProvider());

// Image analysis use case
ImageAnalysis imageAnalysis = new ImageAnalysis.Builder()
.setBackpressureStrategy(ImageAnalysis.STRATEGY_KEEP_ONLY_LATEST)
.build();

BarcodeScannerOptions options = new BarcodeScannerOptions.Builder()
.setBarcodeFormats(Barcode.FORMAT_ALL_FORMATS)
.build();

BarcodeScanner scanner = BarcodeScanning.getClient(options);

imageAnalysis.setAnalyzer(cameraExecutor, image -> processImageProxy(scanner, image));

// Bind to lifecycle
cameraProvider.bindToLifecycle(
(LifecycleOwner) this,
cameraSelector,
preview,
imageAnalysis
);
}

private void processImageProxy(BarcodeScanner scanner, ImageProxy imageProxy) {
@SuppressWarnings("UnsafeOptInUsageError")
InputImage image = InputImage.fromMediaImage(imageProxy.getImage(), imageProxy.getImageInfo().getRotationDegrees());

scanner.process(image)
.addOnSuccessListener(barcodes -> {
if (!barcodes.isEmpty()) {
// Map all barcode bounding boxes to the view coordinates
List mappedBoundingBoxes = new ArrayList();
for (com.google.mlkit.vision.barcode.common.Barcode barcode : barcodes) {
Rect boundingBox = barcode.getBoundingBox();
if (boundingBox != null) {
Rect rect = mapBoundingBoxToView(boundingBox, imageProxy);
mappedBoundingBoxes.add(rect);
}
}

// Update the overlay with all mapped bounding boxes
barcodeOverlay.updateBarcodes(mappedBoundingBoxes);
}
})
.addOnFailureListener(e -> Log.e(TAG, "Barcode detection failed.", e))
.addOnCompleteListener(task -> imageProxy.close());
}

public Rect mapBoundingBoxToView(Rect boundingBox, ImageProxy imageProxy) {

int imageWidth = imageProxy.getWidth();
int imageHeight = imageProxy.getHeight();

int viewWidth = previewView.getWidth();
int viewHeight = previewView.getHeight();

float scaleX = (float) viewWidth / imageHeight;
float scaleY = (float) viewHeight / imageWidth;

float offsetX = (viewWidth - imageHeight * scaleX) / 2;
float offsetY = (viewHeight - imageWidth * scaleY) / 2;

int left = (int) (boundingBox.left * scaleX + offsetX);
int top = (int) (boundingBox.top * scaleY + offsetY);
int right = (int) (boundingBox.right * scaleX + offsetX);
int bottom = (int) (boundingBox.bottom * scaleY + offsetY);

return new Rect(left, top, right, bottom);
}

@Override
protected void onDestroy() {
super.onDestroy();
cameraExecutor.shutdown();
}

@Override
public void onRequestPermissionsResult(int requestCode, @NonNull String[] permissions, @NonNull int[] grantResults) {
super.onRequestPermissionsResult(requestCode, permissions, grantResults);
if (requestCode == REQUEST_CAMERA_PERMISSION) {
if (grantResults.length > 0 && grantResults[0] == PackageManager.PERMISSION_GRANTED) {
startCamera();
} else {
Toast.makeText(this, "Camera permission denied", Toast.LENGTH_SHORT).show();
}
}
}
}
< /code>
class barcodeoverlay < /p>
public class BarcodeOverlay extends View {

private final Paint paint = new Paint();
private List barcodeRects = new ArrayList();

public BarcodeOverlay(Context context, AttributeSet attrs) {
super(context, attrs);
paint.setColor(Color.RED);
paint.setStyle(Paint.Style.STROKE);
paint.setStrokeWidth(5f);
}

public void updateBarcodes(List newBarcodeRects) {
barcodeRects = newBarcodeRects;
invalidate(); // Trigger a redraw
}

@Override
protected void onDraw(Canvas canvas) {
super.onDraw(canvas);
for (Rect rect : barcodeRects) {
canvas.drawRect(rect, paint);
}
}
}
< /code>








< /code>
Please help!
I want to scan barcode and draw bounding boxes but I boxes are not drawing on the barcode rightly.
So after alot of trying and searching I found the solution wihch might be helpful for somebody. The problem was the aspect ratio mismatch.
**SOLVED**
< /code>
So the bouding box code was fine and the following code helped solved the problem:
ResolutionSelector resolutionSelector = new ResolutionSelector.Builder()
.setAspectRatioStrategy(
new AspectRatioStrategy(
AspectRatio.RATIO_16_9, // Preferred aspect ratio
AspectRatioStrategy.FALLBACK_RULE_AUTO // Automatic fallback
)
)
.build();
< /code>
then setting this to imageAnalysis:
ImageAnalysis imageAnalysis = new ImageAnalysis.Builder()
.setResolutionSelector(resolutionSelector)
.setBackpressureStrategy(ImageAnalysis.STRATEGY_KEEP_ONLY_LATEST)
.build();


Подробнее здесь: https://stackoverflow.com/questions/792 ... de-scanner