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Image Tracking and Computer Vision Using Fourier Image Correlation

, 23 Apr 2013
How to teach a program to recognize something within a video stream.
OpenCVDemo3-noexe.zip
OpenCVDemo
Description.odt
OpenCvSharp-2.3.1-x86-20111030
XmlDoc-English
XmlDoc-Japanese
TrackingEyes.jpg
WindowsFormsApplication1
Properties
Settings.settings
OpenCVDemo3.zip
Description.odt
OpenCv-2.3.1-x86
opencv_calib3d231.dll
opencv_contrib231.dll
opencv_core231.dll
opencv_features2d231.dll
opencv_ffmpeg.dll
opencv_flann231.dll
opencv_gpu231.dll
opencv_highgui231.dll
opencv_imgproc231.dll
opencv_legacy231.dll
opencv_ml231.dll
opencv_objdetect231.dll
opencv_ts231.dll
opencv_video231.dll
tbb.dll
OpenCvSharp.Blob.dll
OpenCvSharp.CPlusPlus.dll
OpenCvSharp.DebuggerVisualizers.dll
OpenCvSharp.dll
OpenCvSharp.Extensions.dll
OpenCvSharp.MachineLearning.dll
OpenCvSharp.UserInterface.dll
OpenCvSharpExtern.dll
TrackingEyes.jpg
Settings.settings
///////////////////////////////////////////////////////////////////////////////
//
//  ClassifierUI.cs
//
//  By Philip R. Braica (HoshiKata@aol.com, VeryMadSci@gmail.com)
//
//  Distributed under the The Code Project Open License (CPOL)
//  http://www.codeproject.com/info/cpol10.aspx
///////////////////////////////////////////////////////////////////////////////

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Drawing;
using System.Data;
using System.Linq;
using System.Text;
using System.Windows.Forms;
using OpenCvSharp;

namespace OpenCVDemo
{
    /// <summary>
    /// Classifier UI.
    /// </summary>
    public partial class ClassifierUI : UserControl
    {
        /// <summary>
        /// Classifier.
        /// </summary>
        protected Classifier m_classifier = new Classifier();

        /// <summary>
        /// Capture.
        /// </summary>
        protected CvCapture m_cvCapture = null;

        /// <summary>
        /// Last video file name.
        /// </summary>
        protected string m_videoFileName = "";

        /// <summary>
        /// Video writer.
        /// </summary>
        protected CvVideoWriter m_cvVideoWriter = null;

        /// <summary>
        /// Back buffer.
        /// </summary>
        protected Bitmap m_backBuffer = null;

        /// <summary>
        /// Front buffer.
        /// </summary>
        protected Bitmap m_frontBuffer = null;

        /// <summary>
        /// Constructor.
        /// </summary>
        public ClassifierUI()
        {
            InitializeComponent();
        }

        /// <summary>
        /// Load video.
        /// </summary>
        /// <param name="sender"></param>
        /// <param name="e"></param>
        private void button1_Click(object sender, EventArgs e)
        {
            timer1.Enabled = false;
            button6.Enabled = false;
            OpenFileDialog ofd = new OpenFileDialog();
            DialogResult dr = ofd.ShowDialog();
            if (dr != DialogResult.OK) return;

            if (m_cvCapture != null)
            {
                m_cvCapture.Dispose();
            }
            m_cvCapture = CvCapture.FromFile(ofd.FileName);
            m_videoFileName = ofd.FileName;
        }

        /// <summary>
        /// Append a feature file
        /// </summary>
        /// <param name="sender"></param>
        /// <param name="e"></param>
        private void button3_Click(object sender, EventArgs e)
        {
            OpenFileDialog ofd = new OpenFileDialog();
            DialogResult dr = ofd.ShowDialog();
            if ((dr == DialogResult.OK) || (dr == DialogResult.Yes))
            {
                if (ofd.FileNames == null)
                {
                    m_classifier.AppendFeature(ofd.FileName);
                }
                else
                {
                    if (ofd.FileNames.Length == 0)
                    {
                        m_classifier.AppendFeature(ofd.FileName);
                    }
                    else
                    {
                        for (int i = 0; i < ofd.FileNames.Length; i++)
                        {
                            m_classifier.AppendFeature(ofd.FileNames[i]);
                        }
                    }
                }
                m_classifier.Reset();
            }
        }

        /// <summary>
        /// Clear features.
        /// </summary>
        /// <param name="sender"></param>
        /// <param name="e"></param>
        private void button2_Click(object sender, EventArgs e)
        {
            m_classifier.Features.Clear();
            m_classifier.Reset();
        }

        /// <summary>
        /// Classify.
        /// </summary>
        /// <param name="sender"></param>
        /// <param name="e"></param>
        private void button4_Click(object sender, EventArgs e)
        {
            timer1.Enabled = false;
            m_classifier.Reset();
            if (m_cvCapture != null)
            {
                m_cvCapture.Dispose();
            }
            m_cvCapture = CvCapture.FromFile(m_videoFileName);
            timer1.Enabled = true;
            button6.Enabled = true;
            
        }

        /// <summary>
        /// Classify and save.
        /// </summary>
        /// <param name="sender"></param>
        /// <param name="e"></param>
        private void button5_Click(object sender, EventArgs e)
        {
            timer1.Enabled = false;
            m_classifier.Reset();
            button6.Enabled = false;
            if (m_cvCapture != null)
            {
                m_cvCapture.Dispose();
            }
            m_cvCapture = CvCapture.FromFile(m_videoFileName);
            SaveFileDialog sfd = new SaveFileDialog();
            DialogResult dr = sfd.ShowDialog();
            if (dr != DialogResult.OK)
            {
                return;
            }
            if (m_cvVideoWriter != null)
            {
                m_cvVideoWriter.Dispose();
                m_cvVideoWriter = null;
            }

            m_cvVideoWriter = new CvVideoWriter(sfd.FileName,
                FourCC.DIB, // IYUB, MSVC, DIB, CVID are supported.
                10,
                new CvSize(m_backBuffer.Width, m_backBuffer.Height));
            timer1.Enabled = true;
            button6.Enabled = true;
        }

        /// <summary>
        /// Timer, grabs an input frame if there is one,
        /// triggers processing and handles double buffering as needed.
        /// 
        /// Also uses simple double buffering.
        /// </summary>
        /// <param name="sender"></param>
        /// <param name="e"></param>
        private void timer1_Tick(object sender, EventArgs e)
        {
            // This is demo code, so not everything is thread safe but
            // Since the obvious most annoying race is m_cvCapture changing,
            // This made sence to guard against.
            //
            // Grab a local copy of the reference then act on it.
            CvCapture threadSafeCapture = m_cvCapture;
            if (threadSafeCapture == null) return;
            threadSafeCapture.GrabFrame();
            IplImage img = threadSafeCapture.RetrieveFrame();

            // Video is done.
            if ((img == null) || (threadSafeCapture.PosFrames == threadSafeCapture.FrameCount))
            {
                m_cvCapture.Dispose();
                m_cvCapture = null;
                timer1.Enabled = false;
                button6.Enabled = false;
                if (m_cvVideoWriter != null)
                {
                    m_cvVideoWriter.Dispose();
                    m_cvVideoWriter = null;
                }
                return;
            }

            // Make sure the bitmap buffers are the right size.
            setupBuffers(img.Width, img.Height);

            // Draw the raw frame to the left.
            System.Drawing.Bitmap tmp = img.ToBitmap();
            using (System.Drawing.Graphics g = System.Drawing.Graphics.FromImage(m_backBuffer))
            {
                g.DrawImage(tmp, 0, 0, m_backBuffer.Width, m_backBuffer.Height);
            }

            // Learn if learning.
            m_classifier.Classify(img, m_backBuffer);

            img.Dispose();

            // Save if saving.
            if (m_cvVideoWriter != null)
            {
                CvVideoWriter cvw = m_cvVideoWriter;
                if (cvw != null)
                {
                    if (!cvw.IsDisposed)
                    {
                        IplImage ipltmp = IplImage.FromBitmap(m_backBuffer);
                        cvw.WriteFrame(ipltmp);
                        ipltmp.Dispose();
                    }
                }
            }

            // Dispose of the temp. bitmap.
            tmp.Dispose();


            // Swap left and right buffers and display.
            System.Drawing.Bitmap btmp = m_backBuffer;
            m_backBuffer = m_frontBuffer;
            m_frontBuffer = btmp;
            pictureBox1.Image = m_frontBuffer;
        }

        /// <summary>
        /// Setup the image buffers.
        /// </summary>
        /// <param name="w"></param>
        /// <param name="h"></param>
        protected void setupBuffers(int w, int h)
        {
            bool doSetup = true;
            if (m_backBuffer != null)
            {
                if ((m_backBuffer.Width == w) && (m_backBuffer.Height == h))
                {
                    doSetup = false;
                }
            }
            if (doSetup)
            {
                if (m_backBuffer != null) m_backBuffer.Dispose();
                m_backBuffer = new System.Drawing.Bitmap(w, h, System.Drawing.Imaging.PixelFormat.Format32bppArgb);
            }
        }

        /// <summary>
        /// Stop button.
        /// </summary>
        /// <param name="sender"></param>
        /// <param name="e"></param>
        private void button6_Click(object sender, EventArgs e)
        {
            timer1.Enabled = false;
        }
    }
}

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License

This article, along with any associated source code and files, is licensed under The Code Project Open License (CPOL)

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About the Author

HoshiKata
Software Developer (Senior) KMC Systems
United States United States
Phil is a Principal Software developer focusing on weird yet practical algorithms that run the gamut of embedded and desktop (PID loops, Kalman filters, FFTs, client-server SOAP bindings, ASIC design, communication protocols, game engines, robotics).
 
In his personal life he is a part time mad scientist, full time dad, and studies small circle jujitsu, plays guitar and piano.

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