Bitmap ---> getRGB565 face检测

    Bitmap  getRGB565(Bitmap bitmap){        int i = bitmap.getWidth();        int j = bitmap.getHeight();   //从上步解出的JPEG数组中接出BMP，即RAW->JPEG->BMP        Matrix localMatrix = new Matrix();        localMatrix.postRotate(0.0F, i / 2, j / 2);        Bitmap bitmap_res = Bitmap.createBitmap(i, j, Bitmap.Config.RGB_565);        Paint localPaint = new Paint();        localPaint.setDither(true);        Canvas localCanvas = new Canvas();        localCanvas.setBitmap(bitmap_res);        localCanvas.setMatrix(localMatrix);        localCanvas.drawBitmap(bitmap, 0.0F, 0.0F, localPaint);        return  bitmap_res;    }