C#使用OpenCvSharp3实现摄像头录制及拍照功能_c# opencv 拍照

成果展示

背景

这边有这样的需求，需要对特定的生产片段进行录像，由我系统进行控制。最开始测试了AForge的开源库，但发现x64的情况下，有些类库不能正常运行，才有了现在用的OpenCvSharp3的方式实现。程序的界面参考了网上找的一个AForge的项目界面，感谢！

开发运行环境

win10 x64

.Net Framework 4.6.1

摄像头：海康威视 DS-UVC-U64 Pro

实现方式

首先，nuget OpenCvSharp3

主要代码

 class UvcCamera : CameraInterface
    {
        //标识：是否开始录制，是否暂停
        private bool gIsStartRecord = false; 
        private bool gIsPauseRecord = false;
 
        VideoCapture _gVideoCapture;
        private VideoCapture gVideoCapture { get => _gVideoCapture; set => _gVideoCapture = value; }
 
        VideoWriter _gVideoWriter;
        private VideoWriter gVideoWriter { get => _gVideoWriter; set => _gVideoWriter = value; }
        private Bitmap _CurrentDisplay;
        public override Bitmap CurrentDisplay { get => _CurrentDisplay; set => _CurrentDisplay=value; }
 
        /// <summary>
        /// 录制线程
        /// </summary>
        private Thread gRecordThread;
 
        public override bool Connect(int index)
        {
            try
            {
                gVideoCapture = new VideoCapture(index);
                if (gVideoCapture.IsOpened())
                    return true;
                else
                    return false;
            }
            catch
            {
                return false;
            }
        }
 
        public override void DisConnect()
        {
            gVideoWriter?.Dispose();
            gVideoCapture?.Release();
        }
 
        public override void PauseRecordVideo()
        {
            if(gIsStartRecord)
            {
                gIsPauseRecord = true;
                gIsStartRecord = false;
            }
        }
 
        public override void StartRecordVideo()
        {
            if (!gIsStartRecord)
            {
                if (gIsPauseRecord)
                {
                    gIsStartRecord = true;
                    gIsPauseRecord = false;
                }
                else
                {
                    // 设置输出文件名及格式为MP4
                    string outputFilePath = System.IO.Path.Combine(System.IO.Directory.GetCurrentDirectory(),"Camera",DateTime.Now.ToString("yyyyMMddHHmmss")+".avi");
                    double fps = 30.0;
                    gVideoWriter = new VideoWriter(outputFilePath, FourCC.MP43, fps, new OpenCvSharp.Size(gVideoCapture.FrameWidth, gVideoCapture.FrameHeight), true);
                    //FourCC.MP43
                    gIsStartRecord = true;
                    gRecordThread = new Thread(Record);
                    gRecordThread.Start();
                }
            }
        }
 
        public override void StopRecordVideo()
        {
            gIsStartRecord = false;
            gIsPauseRecord = false;
        }
 
        public override Bitmap TakePhoto()
        {
            Mat photo = new Mat();
            gVideoCapture.Read(photo);
            return BitmapConverter.ToBitmap(photo);
        }
 
        private void Record()
        {
            Mat frame = new Mat();
            while (true)
            {
                // 读取当前帧图像
                gVideoCapture.Read(frame);
                
                //把当前帧转成Bitmap，供前端页面显示
                CurrentDisplay = BitmapConverter.ToBitmap(frame);
 
                // 将图像显示在窗口中
                //Cv2.ImShow("Camera", frame);
 
                if (gIsStartRecord)
                {
                    // 将当前帧写入输出文件
                    gVideoWriter.Write(frame);
                }
                else if (!gIsPauseRecord) //如果没有开启录制，也不是暂停状态，则退出循环
                    break;
 
                Thread.Sleep(10);
            }
        }
 
    }

界面代码

        public VideoForm()
        {
            InitializeComponent();
           
        }
 
        private void btn_Connect_Click(object sender, EventArgs e)
        {
            bool result=gUvc.Connect(0); //默认连接第一个摄像头
            if (result)
                ShowMsg("摄像头连接成功！");
            else
                ShowMsg("摄像头连接失败！");
        }
 
        private void ShowMsg(string msg)
        {
            System.Windows.Forms.MessageBox.Show(msg);
        }
 
        private void btn_Close_Click(object sender, EventArgs e)
        {
            gUvc.DisConnect();
        }
 
        private void btn_StartVideo_Click(object sender, EventArgs e)
        {
            timer_count.Enabled = true;
            gUvc.StartRecordVideo();
        }
 
        private void btn_PauseVideo_Click(object sender, EventArgs e)
        {
            timer_count.Enabled = false;
            gUvc.PauseRecordVideo();
        }
 
        private void btn_EndVideo_Click(object sender, EventArgs e)
        {
            timer_count.Enabled = false;
            tick_num = 0;
            gUvc.StopRecordVideo();
        }
 
        private void timer1_Tick(object sender, EventArgs e)
        {
            pictureBox1.Image = gUvc.CurrentDisplay;
        }
 
        private void btn_Capture_Click(object sender, EventArgs e)
        {
            pictureBoxPhoto.Image = gUvc.TakePhoto();
        }
 
        private void btn_Save_Click(object sender, EventArgs e)
        {
            if(pictureBoxPhoto.Image != null)
            {
                string path = Path.Combine(Directory.GetCurrentDirectory(), "Camera", DateTime.Now.ToString("yyyyMMddHHmmssfff") + ".png");
                pictureBoxPhoto.Image.Save(path);
            }
        }