今天在官网下载了最新版本的C# SDK,使用emgucv播放USB相机视频。测试结果与官方相差很大,官方是720P视频30ms，我电脑的实际结果是78ms-100ms。

这是我电脑配置：

这是源代码，请官网大神相助

BaiduApi.cs

 class BaiduApi
    {
        private static readonly ILog log = LogManager.GetLogger(typeof(BaiduApi));

        // sdk初始化
        [DllImport("BaiduFaceApi.dll", EntryPoint = "sdk_init", CharSet = CharSet.Ansi, CallingConvention = CallingConvention.Cdecl)]
        private static extern int sdk_init(bool id_card);

        // 是否授权
        [DllImport("BaiduFaceApi.dll", EntryPoint = "is_auth", CharSet = CharSet.Ansi , CallingConvention = CallingConvention.Cdecl)]
        private static extern bool is_auth();

        [DllImport("BaiduFaceApi.dll", EntryPoint = "track_by_buf", CharSet = CharSet.Ansi, CallingConvention = CallingConvention.Cdecl)]
        private static extern IntPtr track_by_buf(byte[] image, int size, int max_track_num);


        internal bool isAuth()
        {
            return is_auth();
        }

        internal void sdkInit()
        {
            log.Info("开始初始化");
            int init = sdk_init(false);
            log.InfoFormat("初始化结果：{0}",init);
        }

        private Stopwatch watch = Stopwatch.StartNew();
        internal string TrackFace(byte[] bytes)
        {
            watch.Reset();
            watch.Start();
            int max_track_num = 5; // 设置最多检测人数（多人脸检测），默认为1，最多可设为10
            IntPtr ptr = track_by_buf(bytes, bytes.Length, max_track_num);
            string buf = Marshal.PtrToStringAnsi(ptr);
            log.DebugFormat("track bytes :{0}", buf);
            log.DebugFormat("耗时：{0}", watch.ElapsedMilliseconds);
            return buf;
        }
    }

Main.cs

public partial class Main : Form
    {
        private static readonly ILog log = LogManager.GetLogger(typeof(Main));

        private Capture capture;
        private BaiduApi baiduApi;
        private MCvFont f = new MCvFont(FONT.CV_FONT_HERSHEY_SIMPLEX, 1, 1);

        public Main()
        {
            InitializeComponent();
            baiduApi = new BaiduApi();
            capture = new Capture() {
                 FlipType = FLIP.HORIZONTAL
            };
            Application.Idle += new EventHandler(ProcessFram);
        }

        private void ProcessFram(object sender, EventArgs arg)
        {
            Image frame = capture.QueryFrame();
            if (frame != null)
            {
                string json = baiduApi.TrackFace(ImageUtil.img2byte(frame.Bitmap));
                imageBox1.Image = frame;
            }
        }

        private void Form1_Load(object sender, EventArgs e)
        {
            if (!baiduApi.isAuth())
            {
                baiduApi.sdkInit();
            }
        }
    }