各RGBチャネルにdelayを入れて、Webcamからの入力を画面に表示する

opencv.cs

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Windows;
using System.Windows.Controls;
using System.Windows.Data;
using System.Windows.Documents;
using System.Windows.Input;
using System.Windows.Media;
using System.Windows.Media.Imaging;
using System.Windows.Navigation;
using System.Windows.Shapes;

using OpenCvSharp;
using OpenCvSharp.Extensions;
using System.Threading;

// https://minus9d.hatenablog.com/entry/20130204/1359989829
// http://schima.hatenablog.com/entry/2014/01/30/105406

namespace WpfApp1
{
    /// <summary>
    /// MainWindow.xaml の相互作用ロジック
    /// </summary>
    public partial class MainWindow : System.Windows.Window


    {

        List<Mat> bufferLayerB = new List<Mat>();
        List<Mat> bufferLayerG = new List<Mat>();
        List<Mat> bufferLayerR = new List<Mat>();
        Mat zeros;


        public bool IsExitCapture { get; set; }

        public MainWindow()
        {
            this.InitializeComponent();
        }

        /// <summary>
        /// カメラ画像を取得して次々に表示を切り替える
        /// </summary>
        public virtual void Capture(object state)
        {
            var camera = new VideoCapture(0/*0番目のデバイスを指定*/)
            {
                // キャプチャする画像のサイズフレームレートの指定
                FrameWidth = 1920,
                FrameHeight = 1000,
                // Fps = 60
            };

           

            using (var img = new Mat()) // 撮影した画像を受ける変数
            using (camera)
            {
                var blackimg = new Mat(camera.FrameHeight, camera.FrameWidth, MatType.CV_8UC1, new Scalar(0, 0, 0));
                var splitBlackImg = Cv2.Split(blackimg);
                zeros = splitBlackImg[0];

                var video = new VideoWriter("d:\a.avi", 0, camera.Fps, new OpenCvSharp.Size(camera.FrameWidth, camera.FrameHeight));


                while (true)
                {
                    if (this.IsExitCapture)
                    {
                        this.Dispatcher.Invoke(() => this._Image.Source = null);
                        break;
                    }

                    camera.Read(img); // Webカメラの読み取り（バッファに入までブロックされる

                    if (img.Empty())
                    {
                        break;
                    }

                    var splitImg = Cv2.Split(img);
                    var layerB = splitImg[0];
                    var layerG = splitImg[1];
                    var layerR = splitImg[2];

                    bufferLayerB.Add(layerB);
                    bufferLayerG.Add(layerG);
                    bufferLayerR.Add(layerR);

                    Mat[] dstLayers = new Mat[3];
                    Mat dst = new Mat();

                    dstLayers[2] = bufferLayerB[0];
                    dstLayers[1] = bufferLayerG[0];
                    dstLayers[0] = bufferLayerR[0];
                    bufferLayerB.RemoveAt(0);
                    bufferLayerG.RemoveAt(0);
                    bufferLayerR.RemoveAt(0);

                    Cv2.Merge(dstLayers, dst);

                    this.Dispatcher.Invoke(() =>
                    {
                        //video.Write(dst);
                        this._Image.Source = dst.ToWriteableBitmap();
                        // this._Image.Source = img.ToWriteableBitmap(); 

                    });
                }
                video.Dispose();
            }
        }

        // ---- EventHandlers ----

        /// <summary>
        /// Windowがロードされた時
        /// </summary>
        private void Window_Loaded(object sender, RoutedEventArgs e)
        {
            ThreadPool.QueueUserWorkItem(this.Capture);
        }

        /// <summary>
        /// Exit Captureボタンが押され時
        /// </summary>
        protected virtual void Button_Click(object sender, RoutedEventArgs e)
        {
            this.IsExitCapture = true;
            
        }

        private void SliderR_ValueChanged(object sender, RoutedPropertyChangedEventArgs<double> e)
        {
            int delayR = (int)sliderR.Value;
            bufferLayerR = new List<Mat>();
            for (int i = 0; i < delayR; i++)
            {
                bufferLayerR.Add(zeros);
            }
        }

        private void SliderG_ValueChanged(object sender, RoutedPropertyChangedEventArgs<double> e)
        {
            int delayG = (int)sliderG.Value;
            bufferLayerG = new List<Mat>();
            for (int i = 0; i < delayG; i++)
            {
                bufferLayerG.Add(zeros);
            }
        }

        private void SliderB_ValueChanged(object sender, RoutedPropertyChangedEventArgs<double> e)
        {
            int delayB = (int)sliderB.Value;
            bufferLayerB = new List<Mat>();
            for (int i = 0; i < delayB; i++)
            {
                bufferLayerB.Add(zeros);
            }

        }
    }
}