How to keep android from inverting the image from the front facing camera?

Question

My video Camera app does record in the landscape mode, but the front facing camera previews the regular image, but the actual recording is mirrored (flipped or inverted) across the axis.

Everything works great on normal rear camera.

Can anybody suggest me a way to avoid it ? Any suggestions or source code would help a lot. Thank you.

Have you seen http://stackoverflow.com/questions/9754346/prevent-flipping-of-the-android-front-facing-camera/17569915#17569915 This works for API >= 14. — Steve, Jul 10 '13 at 11:54

score 11 · Answer 1 · answered Apr 30 '12 at 20:51

11

The bad news: this mirroring is hardcoded into the camera service, and can not be disabled.

The good news: if you are on a recent API (API level >= 14), you can easily use a TextureView to mirror the preview image back to the original. Take the TextureView Example over at the Android Documentation, then use setTransform to set a mirroring transform. This will revert the preview image back to the non-mirrored original.

Note that a mirror transform is the same as a scaling transform with a -1 scale on the X axis.

If you are on an older API version, you might be able to do the same with a SurfaceView (using setScaleX, API level >= 11).

answered Apr 30 '12 at 20:51

Paul-Jan

16,746
1
63
95

@Paul-Jan can you give me a example code with setTransform to flip the preview – Aswathy Jan 02 '14 at 06:10
2

`setScaleX(-1)` results in black `SurfaceView` (API 21). – TWiStErRob Jul 02 '16 at 12:01
Is there any way to save the image without inverting? not only displaying it? – DAVIDBALAS1 Jul 03 '16 at 13:53

score 4 · Answer 2 · edited May 23 '17 at 12:18

4

Try applying a transformation matrix to a TextureView. As per Prevent flipping of the front facing camera

This works for API level >= 14

edited May 23 '17 at 12:18

Community

1
1

answered Jul 10 '13 at 11:56

Steve

161
1
4

score 4 · Answer 3 · answered Jan 31 '21 at 09:34

4

You can change camera picture mirror to exact preview if you use this code

ImageCapture.Metadata metadata = new ImageCapture.Metadata();
                metadata.setReversedHorizontal(true); // This method will fix mirror issue
                options = new ImageCapture.OutputFileOptions.Builder(imageOutFile).setMetadata(metadata).build();

answered Jan 31 '21 at 09:34

zia Shahid

51
1

1

note that you should check if lensFacing == CameraSelector.DEFAULT_FRONT_CAMERA 'cause it's inverting everything – Marina Feb 11 '22 at 08:51

score 0 · Answer 4 · answered Dec 18 '20 at 11:31

in OpenCV JavaCameraView;

public Mat onCameraFrame(CameraBridgeViewBase.CvCameraViewFrame inputFrame) {
    imageMat = inputFrame.rgba().t();
    if (//horizontal reverse)
        Core.flip(imageMat, imageMat, 1);
    else //for vertical reverse
        Core.flip(imageMat, imageMat, -1);

How to keep android from inverting the image from the front facing camera?

4 Answers4

Linked