Question

//----------------------------------------------------------------------------
//  Copyright (C) 2004-2013 by EMGU. All rights reserved.       
//----------------------------------------------------------------------------

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Text;
using System.Windows.Forms;
using Emgu.CV;
using Emgu.CV.Structure;
using Emgu.CV.VideoSurveillance;
using Emgu.Util;

namespace MotionDetection
{
   public partial class Form1 : Form
   {
      private Capture _capture;
      private MotionHistory _motionHistory;
      private IBGFGDetector<Bgr> _forgroundDetector;

      public Form1()
      {
         InitializeComponent();

         //try to create the capture
         if (_capture == null)
         {
            try
            {
               _capture = new Capture();
            }
            catch (NullReferenceException excpt)
            {   //show errors if there is any
               MessageBox.Show(excpt.Message);
            }
         }

         if (_capture != null) //if camera capture has been successfully created
         {
            _motionHistory = new MotionHistory(
                1.0, //in second, the duration of motion history you wants to keep
                0.05, //in second, maxDelta for cvCalcMotionGradient
                0.5); //in second, minDelta for cvCalcMotionGradient

            _capture.ImageGrabbed += ProcessFrame;
            _capture.Start();
         }
      }

      private void ProcessFrame(object sender, EventArgs e)
      {
         using (Image<Bgr, Byte> image = _capture.RetrieveBgrFrame())
         using (MemStorage storage = new MemStorage()) //create storage for motion components
         {
            if (_forgroundDetector == null)
            {
               //_forgroundDetector = new BGCodeBookModel<Bgr>();
               _forgroundDetector = new FGDetector<Bgr>(Emgu.CV.CvEnum.FORGROUND_DETECTOR_TYPE.FGD);
               //_forgroundDetector = new BGStatModel<Bgr>(image, Emgu.CV.CvEnum.BG_STAT_TYPE.FGD_STAT_MODEL);
            }

            _forgroundDetector.Update(image);

            capturedImageBox.Image = image;

            //update the motion history
            _motionHistory.Update(_forgroundDetector.ForegroundMask);

            forgroundImageBox.Image = _forgroundDetector.ForegroundMask;

            #region get a copy of the motion mask and enhance its color
            double[] minValues, maxValues;
            Point[] minLoc, maxLoc;
            _motionHistory.Mask.MinMax(out minValues, out maxValues, out minLoc, out maxLoc);
            Image<Gray, Byte> motionMask = _motionHistory.Mask.Mul(255.0 / maxValues[0]);
            #endregion

            //create the motion image 
            Image<Bgr, Byte> motionImage = new Image<Bgr, byte>(motionMask.Size);
            //display the motion pixels in blue (first channel)
            motionImage[0] = motionMask;

            //Threshold to define a motion area, reduce the value to detect smaller motion
            double minArea = 100;

            storage.Clear(); //clear the storage
            Seq<MCvConnectedComp> motionComponents = _motionHistory.GetMotionComponents(storage);

            //iterate through each of the motion component
            foreach (MCvConnectedComp comp in motionComponents)
            {
               //reject the components that have small area;
               if (comp.area < minArea) continue;

               // find the angle and motion pixel count of the specific area
               double angle, motionPixelCount;
               _motionHistory.MotionInfo(comp.rect, out angle, out motionPixelCount);

               //reject the area that contains too few motion
               if (motionPixelCount < comp.area * 0.05) continue;

               //Draw each individual motion in red
               DrawMotion(motionImage, comp.rect, angle, new Bgr(Color.Red));
            }

            // find and draw the overall motion angle
            double overallAngle, overallMotionPixelCount;
            _motionHistory.MotionInfo(motionMask.ROI, out overallAngle, out overallMotionPixelCount);
            DrawMotion(motionImage, motionMask.ROI, overallAngle, new Bgr(Color.Green));

            //Display the amount of motions found on the current image
            UpdateText(String.Format("Total Motions found: {0}; Motion Pixel count: {1}", motionComponents.Total, overallMotionPixelCount));

            //Display the image of the motion
            motionImageBox.Image = motionImage;
         }
      }

      private void UpdateText(String text)
      {
         if (InvokeRequired && !IsDisposed)
         {
            Invoke((Action<String>)UpdateText, text);
         }
         else
         {
            label3.Text = text;
         }
      }

      private static void DrawMotion(Image<Bgr, Byte> image, Rectangle motionRegion, double angle, Bgr color)
      {
         float circleRadius = (motionRegion.Width + motionRegion.Height) >> 2;
         Point center = new Point(motionRegion.X + motionRegion.Width >> 1, motionRegion.Y + motionRegion.Height >> 1);

         CircleF circle = new CircleF(
            center,
            circleRadius);

         int xDirection = (int)(Math.Cos(angle * (Math.PI / 180.0)) * circleRadius);
         int yDirection = (int)(Math.Sin(angle * (Math.PI / 180.0)) * circleRadius);
         Point pointOnCircle = new Point(
             center.X + xDirection,
             center.Y - yDirection);
         LineSegment2D line = new LineSegment2D(center, pointOnCircle);

         image.Draw(circle, color, 1);
         image.Draw(line, color, 2);
      }

      /// <summary>
      /// Clean up any resources being used.
      /// </summary>
      /// <param name="disposing">true if managed resources should be disposed; otherwise, false.</param>
      protected override void Dispose(bool disposing)
      {

         if (disposing && (components != null))
         {
            components.Dispose();
         }

         base.Dispose(disposing);
      }

      private void Form1_FormClosed(object sender, FormClosedEventArgs e)
      {
         _capture.Stop();
      }
   }
}

我编译了emgu cv示例

他的名字是 MotionDetection

但是当我编译那个例子时，结果是错误，他给了我消息

＆＃39; Emgu.CV.CvInvoke＆＃39;的类型初始值设定项抛出异常。

我坚持这个_capture = new Capture();

我添加了对项目的引用我已将opencv_core290.dll，opencv_highgui290.dll和opencv_imgproc290.dll复制到项目文件夹但它仍然无法正常工作

消息仍然相同 ＆＃39; Emgu.CV.CvInvoke＆＃39;的类型初始值设定项抛出异常。

我使用Visual Studio 2012 Ultimate和Win 8.1 有谁可以帮助我？

谢谢：）

Answer 1

The type initializer for 'Emgu.CV.CvInvoke' threw an exception表示您需要查看类的静态构造函数，或者查找该类的任何静态成员的初始化。最重要的是，我会看看你的异常被抛出的InnerException属性。

我愿意打赌你有不正确或非法使用的静态方法或元素。

请在此处了解TypeInitializationException：http://msdn.microsoft.com/en-us/library/system.typeinitializationexception(v=vs.110).aspx

Answer 2

'Emgu.CV.CvInvoke'的类型初始值设定项引发了异常，这意味着EMGU.CV文件没有按代码检测。这是由于系统依赖性。您需要进入visual stdio中的configration manger窗口并选择所需的平台，然后根据您的平台复制相应的dll文件（64位dll文件forx64和32位dll for x86可以从emgu网站下载）。现在复制它没有像emgu.cv.invoke

这样的错误

为什么emgu cv例子没有用？

2 个答案: