如何在WPF中使用眼动追踪来缩放图像？

2023年5月27日 201次阅读

我正试图通过打开或眯着眼睛从网络摄像头的实时视频流中放大和缩小每一帧.我已经将眼动追踪部分工作了,但我无法找出适合ScaleTransform的位置.以下是我现有的代码：

using System;
using System.Collections.Generic;
using System.Windows.Forms;
using Emgu.CV.Structure;
using Emgu.CV.UI;
using Emgu.CV;
using System.Drawing;
using System.Diagnostics;
using System.Windows.Media;

namespace eyeDetection
{
   static class Program
   {
      /// <summary>
      /// The main entry point for the application.
      /// </summary>
      [STAThread]
      static void Main()
      {
         Application.EnableVisualStyles();
         Application.SetCompatibleTextRenderingDefault(false);
         Run();
      }

      static void Run()
      {
          ImageViewer viewer = new ImageViewer(); //create an image viewer
          Capture capture = new Capture(); //create a camera capture
          Application.Idle += new EventHandler(delegate(object sender, EventArgs e)
              {   // run this until application closed (close button click on image viewer)
                  Image<Bgr, Byte> image = capture.QueryFrame();
                  Image<Gray, Byte> gray = image.Convert<Gray, Byte>(); //Convert it to Grayscale

                  Stopwatch watch = Stopwatch.StartNew();
                  //normalizes brightness and increases contrast of the image
                  gray._EqualizeHist();

                  //Read the HaarCascade objects
                 HaarCascade eye = new HaarCascade("haarcascade_eye.xml");

                 MCvAvgComp[][] eyeDetected = gray.DetectHaarCascade(
                     eye,
                     1.1,
                     10,
                     Emgu.CV.CvEnum.HAAR_DETECTION_TYPE.DO_CANNY_PRUNING,
                     new Size(20, 20));

                  foreach (MCvAvgComp e in eyeDetected[0])
                  {
                      //draw the eyes detected in the 0th (gray) channel with blue color
                      image.Draw(e.rect, new Bgr(Color.Blue), 2);
                  }


                    watch.Stop();
                  //display the image 
                  viewer.Image = image; //draw the image obtained from camera
              });
          viewer.ShowDialog(); //show the image viewer
      }
   }
}

最佳答案 这不是WPF,它是一个WinForms应用程序. ImageViewer是一个由EmguCV提供的类,它继承自System.Windows.Forms.Form,没有WPF.

您将需要创建一个新的WPF项目,集成您的代码,并创建自己的WPF视图来托管图像,然后您可以在文档的元素上设置变换.

如果您只想使用WinForms查看器,则可以引用ImageViewer :: ImageBox属性. ImageBox类本机支持缩放和平移.它具有ZoomScale属性,可以通过编程方式设置,还可以访问Horizo​​ntalScrollBar和VerticalScrollBar属性来控制平移位置.

viewer.ImageBox.ZoomScale = 2.0;  // zoom in by 2x
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