IssueTracker

CAMERAX VERSION: 1.3.0

DESCRIPTION:

We are using MLKitAnalyzer with CameraController to scan QR codes. When upgrading from version 1.2.3 to 1.3.0 and above, we've noticed that the camera must be positioned very close to the QR code in order to successfully scan it. Previously, QR codes were scannable from a greater distance away from the camera.

ADDITIONAL INFORMATION:

It appears that the issue may be related to the resolution and the new ResolutionSelector API. Manually setting the ResolutionStrategy via setImageAnalysisResolutionSelector added in version 1.4.0-alpha4 improves the accuracy.

EXAMPLE CONFIGURATION:

val previewView: PreviewView = findViewById(R.id.viewFinder)
val cameraController = LifecycleCameraController(baseContext)

val options = BarcodeScannerOptions.Builder()
    .setBarcodeFormats(Barcode.FORMAT_QR_CODE)
    .build()
val barcodeScanner = BarcodeScanning.getClient(options)

cameraController.setImageAnalysisAnalyzer(
    ContextCompat.getMainExecutor(this),
    MlKitAnalyzer(
        listOf(barcodeScanner),
        COORDINATE_SYSTEM_VIEW_REFERENCED,
        ContextCompat.getMainExecutor(this)
    ) { result: MlKitAnalyzer.Result? ->
        result?.getValue(barcodeScanner)?.firstOrNull()?.rawValue?.let { qrCode ->
            cameraController.unbind()
            Toast.makeText(
                this,
                qrCode,
                Toast.LENGTH_LONG
            ).show()
        }
    }
)

cameraController.cameraSelector = CameraSelector.DEFAULT_BACK_CAMERA
cameraController.bindToLifecycle(this)
previewView.controller = cameraController