android - 如何将YUV_420_888图像转换为位图

Question

我正在开发 AR 项目，我需要捕获当前帧并将其保存到图库。我可以使用AR core中的Frame类获取图像，但图像的格式是YUV_420_888。我已经尝试了很多解决方案来将其转换为位图，但无法解决它。

Answer 1

这就是我转换为 jpeg 的方法。

public Bitmap imageToBitmap(Image image, float rotationDegrees) {

    assert (image.getFormat() == ImageFormat.NV21);

    // NV21 is a plane of 8 bit Y values followed by interleaved  Cb Cr
    ByteBuffer ib = ByteBuffer.allocate(image.getHeight() * image.getWidth() * 2);

    ByteBuffer y = image.getPlanes()[0].getBuffer();
    ByteBuffer cr = image.getPlanes()[1].getBuffer();
    ByteBuffer cb = image.getPlanes()[2].getBuffer();
    ib.put(y);
    ib.put(cb);
    ib.put(cr);

    YuvImage yuvImage = new YuvImage(ib.array(),
            ImageFormat.NV21, image.getWidth(), image.getHeight(), null);

    ByteArrayOutputStream out = new ByteArrayOutputStream();
    yuvImage.compressToJpeg(new Rect(0, 0,
            image.getWidth(), image.getHeight()), 50, out);
    byte[] imageBytes = out.toByteArray();
    Bitmap bm = BitmapFactory.decodeByteArray(imageBytes, 0, imageBytes.length);
    Bitmap bitmap = bm;

    // On android the camera rotation and the screen rotation
    // are off by 90 degrees, so if you are capturing an image
    // in "portrait" orientation, you'll need to rotate the image.
    if (rotationDegrees != 0) {
      Matrix matrix = new Matrix();
      matrix.postRotate(rotationDegrees);
      Bitmap scaledBitmap = Bitmap.createScaledBitmap(bm,
              bm.getWidth(), bm.getHeight(), true);
      bitmap = Bitmap.createBitmap(scaledBitmap, 0, 0,
              scaledBitmap.getWidth(), scaledBitmap.getHeight(), matrix, true);
    }
    return bitmap;
  }