使用OpenCvSharp將YUV420圖像換轉為BGR圖像

在Winform中需要顯示視頻流的時候，會遇到YUV420編碼的情況。思路是將YUV420的圖像轉換為BGR格式，然后給PictureBox控件渲染。因此可以使用OpenCvSharp庫（NuGet獲取）將YUV420編碼的字節數組轉換為BGR編碼的字節數組，然后構建Image對象進行渲染。

/// <summary>
/// YUV圖像轉換為BGR圖像
/// </summary>
/// <param name="yuvData">YUV格式字節數組</param>
/// <param name="width">圖像寬度</param>
/// <param name="height">圖像高度</param>
/// <returns>BGR格式字節數組</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);