使用OpenCvSharp将YUV420图像换转为BGR图像

在Winform中需要显示视频流的时候，会遇到YUV420编码的情况。思路是将YUV420的图像转换为BGR格式，然后给PictureBox控件渲染。因此可以使用OpenCvSharp库（NuGet获取）将YUV420编码的字节数组转换为BGR编码的字节数组，然后构建Image对象进行渲染。

/// <summary>
/// YUV图像转换为BGR图像
/// </summary>
/// <param name="yuvData">YUV格式字节数组</param>
/// <param name="width">图像宽度</param>
/// <param name="height">图像高度</param>
/// <returns>BGR格式字节数组</returns>
private static byte[] ConvertYuv2Bgr(byte[] yuvData, int width, int height)
{
    using (var imgYuv = new Mat(height + height / 2, width, MatType.CV_8UC1, yuvData))
    using (var imgDst = new Mat(height, width, MatType.CV_8UC3))
    {
        Cv2.CvtColor(imgYuv, imgDst, ColorConversionCodes.YUV2BGR_I420, 0);
        return imgDst.ToBytes();
    }
}

var bgrBytes = ConvertYuv2Bgr(yuvData, info.nWidth, info.nHeight);
var stream = new MemoryStream(bgrBytes);
var image = Image.FromStream(stream);