Incorrect image converting YUV_420_888 into Bitmaps under Android camera2

Question

I’m trying to convert YUV_420_888 images into bitmaps, coming from the camera2 preview. But the output image has incorrect colors.

Next is the test code I’m running

Answer 1

RenderScript support YUV_420_888 as ScriptIntrinsicYuvToRGB's source

1. create Allocation & ScriptIntrinsicYuvToRGB

   RenderScript renderScript = RenderScript.create(this);
   ScriptIntrinsicYuvToRGB mScriptIntrinsicYuvToRGB = ScriptIntrinsicYuvToRGB.create(renderScript, Element.YUV(renderScript));
   Allocation mAllocationInYUV = Allocation.createTyped(renderScript, new Type.Builder(renderScript, Element.YUV(renderScript)).setYuvFormat(ImageFormat.YUV_420_888).setX(480).setY(640).create(), Allocation.USAGE_IO_INPUT | Allocation.USAGE_SCRIPT);
   Allocation mAllocationOutRGB = Allocation.createTyped(renderScript, Type.createXY(renderScript, Element.RGBA_8888(renderScript), 480, 640), Allocation.USAGE_SCRIPT | Allocation.USAGE_IO_OUTPUT);
   

2. set Allocation.getSurface() to receive image data from camera

   final CaptureRequest.Builder captureRequest = session.getDevice().createCaptureRequest(CameraDevice.TEMPLATE_PREVIEW);
   captureRequest.addTarget(mAllocationInYUV.getSurface());
   

3. output to a TextureView or ImageReader or SurfaceView

   mAllocationOutRGB.setSurface(new Surface(mTextureView.getSurfaceTexture()));
   mAllocationInYUV.setOnBufferAvailableListener(new Allocation.OnBufferAvailableListener() {
       @Override
       public void onBufferAvailable(Allocation a) {
           a.ioReceive();
           mScriptIntrinsicYuvToRGB.setInput(a);
           mScriptIntrinsicYuvToRGB.forEach(mAllocationOutRGB);
           mAllocationOutRGB.ioSend();
       }
   });