yuv420p轉為emgucv的圖像格式Emgu.CV.Image<Bgr, Byte>

GCHandle handle = GCHandle.Alloc(yuvs, GCHandleType.Pinned);

Emgu.CV.Image<Bgr, Byte> image = new Image<Bgr, Byte>(640, 480);
using (Image<Bgr, Byte> yuv420p = new Image<Bgr, byte>(640, (480 >> 1) * 3, 640, handle.AddrOfPinnedObject())) 
{ 
    CvInvoke.CvtColor(yuv420p, image, Emgu.CV.CvEnum.ColorConversion.Yuv420P2Bgr); //image now contains the same yuv image in bgr color space //
    this.imgboxVideo.Image = image; 
} 

if (handle.IsAllocated) handle.Free();      

說明：

1、yuvs為yuv的byte[]數組，

假設ys，vs，us為一幀圖像的y,u,v對應的數組，可以這樣擷取

byte[] yuvs = new byte[ys.Length + vs.Length + us.Length]; ys.CopyTo(yuvs, 0); vs.CopyTo(yuvs, ys.Length); us.CopyTo(yuvs, ys.Length + vs.Length);

2. 640為yuv圖像的寬，480為高，根據實際需要修改

3.效率上建立Image比較慢

Emgu.CV.Image<Bgr, Byte> image = new Image<Bgr, Byte>(640, 480);，

可以作為程式的全局變量一開始建立，其他轉換很快的

Emgu.CV.CvEnum.ColorConversion有很多枚舉值，注意根據yuv格式進行選擇。比如yv12有Yuv2BgrYv12      

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