yuv420p转为emgucv的图像格式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();

说明：

1、yuvs为yuv的byte[]数组，
假设ys，vs，us为一帧图像的y,u,v对应的数组，可以这样获取
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为yuv图像的宽，480为高，根据实际需要修改
3.效率上创建Image比较慢
Emgu.CV.Image<Bgr, Byte> image = new Image<Bgr, Byte>(640, 480);，
可以作为程序的全局变量一开始创建，其他转换很快的

Emgu.CV.CvEnum.ColorConversion有很多枚举值，注意根据yuv格式进行选择。比如yv12有Yuv2BgrYv12

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