如何在Silverlight中从网络摄像头翻转视频捕获

Question

I noticed that when I am doing video capture from webcam in Silverlight video is "reversed" meaning when I am moving right then me on a screen moving left. Is there any way to flip video capture?

Answer 1

I could flip left right and this is how you can do it.

private WriteableBitmap flipVideo(WriteableBitmap notFliped)
    {
        WriteableBitmap motionBmp = new WriteableBitmap(notFliped.PixelWidth, notFliped.PixelHeight);
        int leftRight = -1;
        int[] flipedArray = motionBmp.Pixels;
        int[] currentArray = notFliped.Pixels;
        for (int h = 0; h < 480; h++)
        {
            leftRight++;
            for (int w = 0; w < 640; w++)
            {
                flipedArray[h * 640 + w] = currentArray[639 + (h * 640) - w];
            }
        }
        return motionBmp;
    }

note that 640 and 480 are the camera resolutions and adjust them to your values. I don't know if webcam default support any other resolution. But If 640*480 then you can use this code as it is. Also you need to understand that even if the one cam frame looks like this in pixels ((3x3) picture)

0,1,2...................................................................................... 3,4,5...................................................................................... 6,7,8......................................................................................

bitmap.Pixels return []={0,1,2,3..8} so you need to flip the values row by row into this

2,1,0...................................................................................... 5,4,3...................................................................................... 8,7,6......................................................................................

this is what the above code does.. cheers..and just ignore the dots...

Answer 2

我通过在Blend中打开项目来翻转矩形，选择矩形->属性->变换->按Y翻转。以前我怎么没看到它……（悲伤的长号）