当我将rgb位图转换为yuv时，会产生红色图像。 我想以YUV格式从图库中读取图像或将RGB位图转换为YUV

Question

我想使用图像的Y，U和V通道。 如何定位这些渠道？ 需要帮助进行转换。 请给我一些示例代码。 这是我的代码。

public void YUVImage(View view) {
    Bitmap bitmap = ((BitmapDrawable)OrignalImg.getDrawable()).getBitmap();//reading image from imageView

    int bwidth = bitmap.getWidth();
    int bheight = bitmap.getHeight();
    Bitmap mutableBitmap = bitmap.copy(Bitmap.Config.ARGB_8888, true);
    Canvas c = new Canvas(mutableBitmap);

    Toast.makeText(this, "Done 1 ok ",
            Toast.LENGTH_LONG).show();  

    Paint paint = new Paint();
    paint.setAntiAlias(true);
    paint.setFilterBitmap(true);

    Toast.makeText(this, "Done 2 ok ",
          Toast.LENGTH_LONG).show();    

    ColorMatrix yuvMatrix = new ColorMatrix();
    yuvMatrix.setRGB2YUV();

    Toast.makeText(this, "Now Yuv ok ",
          Toast.LENGTH_LONG).show();

    ColorFilter filter = new ColorMatrixColorFilter(yuvMatrix);
    paint.setColorFilter(filter);
    Matrix matrix = new Matrix();
    matrix.setTranslate(2*bwidth, 2*bheight); 
    c.drawBitmap(mutableBitmap, 0, 0, paint);

    Toast.makeText(this, "Canvas ok ",
          Toast.LENGTH_LONG).show();    

    ImageView mImg=null;
    mImg = (ImageView) findViewById(R.id.imageView1);
    mImg.setImageDrawable(new BitmapDrawable(getResources(), mutableBitmap));
    //mImg.setImageBitmap(newBitmap);

     Toast.makeText(this, "YUV Image converted",
             Toast.LENGTH_LONG).show(); 

  }

Answer 1

如果只需要这些值，那么您只需要简单的数学运算即可。

void rgb2yuv(int r, int g, int b) {
    int y = (int)(0.299 * r + 0.587 * g + 0.114 * b);
    int u = (int)((b - y) * 0.492f); 
    int v = (int)((r - y) * 0.877f);
}

Answer 2

只需将0替换为您的图片尺寸即可。

c.drawBitmap（mutableBitmap，x，y，paint）;

它帮助了我。