Camerax lens focus distance not working

[Talal Shah]

I am using CameraX to develop a QR code scanner. I've attached an image as well. My requirement is that when the user opens the app, the camera should already be focused at a certain distance. I've disabled the autofocus functionality because I need to take a picture of the QR code.

I've implemented ImageAnalysis, but I'm getting a blurry image. The current implementation only works when I place the QR code very close to the camera. I want to capture the QR code from a bit farther away, but when I try adding a floating distance point, it doesn't work as expected.

camerax version 1.4.0

Camera2Interop.Extender<Preview> camera2Extender = new Camera2Interop.Extender<>(builder1);

// Disable auto-focus mode
camera2Extender.setCaptureRequestOption(
        CaptureRequest.CONTROL_AF_MODE,
        CameraMetadata.CONTROL_AF_MODE_OFF
);

// Set focus distance to a balanced value for mid-range focus
camera2Extender.setCaptureRequestOption(
        CaptureRequest.LENS_FOCUS_DISTANCE,
        0.3f // Adjust this value as needed for your use case
);

preview.setSurfaceProvider(previewView.getSurfaceProvider());

[Scott Nien]

Not sure If I fully understand your requirement, but will it work for you if you force focusing on the center right in the beginning?

camera = bindToLifecycle(..) MeteringPoint pt= (new SurfaceOrientedMeteringPointFactory(1.0f, 1.0f))             .createPoint(0.5f, 0.5f); camera.getCameraControl().startFocusAndMetering(         new FocusMeteringAction.Builder(pt) .disableAutoCancel() // keep the current focus forever                 .build() )

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[Talal Shah]

Hello Scott,

My requirement is to open the camera to scan QR code and after scanning I want to get QR code image for this I'm using ImageAnalysis but as I use autofocus I sometimes get blurry image to avoid this I want my camera to focus at the center of the screen at some distance from the camera where I will bring my QR code to scan and these camera focus setting is saved throughout the process without autofocus.