本帖最后由 机器谱 于 2023-4-14 09:51 编辑
1. 功能说明
通过摄像头识别圆形及矩形两种形状。
2. 电子硬件
本实验中采用了以下硬件:
主控板 | Basra主控板(兼容Arduino Uno) | 扩展板 | Bigfish2.1扩展板 | 电池 | 7.4V锂电池 | 通信 | 2510通信转接板 | WiFi路由器 | 其它
| 摄像头 | 配置OpenCV的Visual Studio 2015.net环境的计算机一台
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3. 功能实现
工作原理:
① 导入一张图片或者通过WiFi传递摄像信息给PC;
② 在PC端使用OpenCV对图像转化为灰度图像;
③ 检测圆形和矩形。
检测圆形使用霍夫变换: - vector<Vec3f> circles;
- HoughCircles(image, circles, HOUGH_GRADIENT, 2.0,
- image.rows/8, // change this value to detect circles with different distances to each other
- 200, 85, 0, 0 // change the last two parameters
- // (min_radius & max_radius) to detect larger circles
- );
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检测矩形: - //多边形检测,通过约束条件寻找矩形
- static void findSquares(const Mat& image, vector<vector<Point> >& squares)
- {
- squares.clear();
- Mat pyr, timg, gray0(image.size(), CV_8U), gray;
- // down-scale and upscale the image to filter out the noise
- pyrDown(image, pyr, Size(image.cols / 2, image.rows / 2));
- pyrUp(pyr, timg, image.size());
- vector<vector<Point> > contours;
- // find squares in every color plane of the image
- for (int c = 0; c < 3; c++)
- {
- int ch[] = { c, 0 };
- mixChannels(&timg, 1, &gray0, 1, ch, 1);
- // try several threshold levels
- for (int l = 0; l < N; l++)
- {
- // hack: use Canny instead of zero threshold level.
- // Canny helps to catch squares with gradient shading
- if (l == 0)
- {
- // apply Canny. Take the upper threshold from slider
- // and set the lower to 0 (which forces edges merging)
- Canny(gray0, gray, 0, thresh, 5);
- // dilate canny output to remove potential
- // holes between edge segments
- dilate(gray, gray, Mat(), Point(-1, -1));
- }
- else
- {
- // apply threshold if l!=0:
- // tgray(x,y) = gray(x,y) < (l+1)*255/N ? 255 : 0
- gray = gray0 >= (l + 1) * 255 / N;
- }
- // find contours and store them all as a list
- findContours(gray, contours, RETR_LIST, CHAIN_APPROX_SIMPLE);
- vector<Point> approx;
- // test each contour
- for (size_t i = 0; i < contours.size(); i++)
- {
- // approximate contour with accuracy proportional
- // to the contour perimeter
- approxPolyDP(Mat(contours[i]), approx, arcLength(Mat(contours[i]), true)*0.02, true);
- // square contours should have 4 vertices after approximation
- // relatively large area (to filter out noisy contours)
- // and be convex.
- // Note: absolute value of an area is used because
- // area may be positive or negative - in accordance with the
- // contour orientation
- if (approx.size() == 4 &&
- fabs(contourArea(Mat(approx))) > 1000 &&
- isContourConvex(Mat(approx)))
- {
- double maxCosine = 0;
- for (int j = 2; j < 5; j++)
- {
- // find the maximum cosine of the angle between joint edges
- double cosine = fabs(angle(approx[j % 4], approx[j - 2], approx[j - 1]));
- maxCosine = MAX(maxCosine, cosine);
- }
- // if cosines of all angles are small
- // (all angles are ~90 degree) then write quandrange
- // vertices to resultant sequence
- if (maxCosine < 0.3)
- squares.push_back(approx);
- }
- }
- }
- }
- }
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3.1硬件连接
将摄像头与路由器连接,启动路由器,将PC连接到路由器的WIFI网络。
接线说明:
① 将2510通信转接板连接到扩展板的扩展坞上面;
② 用3根母对母杜邦线将2510通信转接板与WiFi路由器连接起来,GND-GND、RX-RX、TX-TX;
③ 找到1根USB线,一端连接到2510通信转接板接口上,另一端连接到WiFi路由器USB接口上;
④ 将摄像头线连接到WiFi路由器接口上。
3.2示例程序
下面提供一个可以进行识别圆形和矩形的参考例程(ShapeDetect\ShapeDetect\MainWindow.xaml.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 System.Windows.Forms;
- using System.Runtime.InteropServices;
- using System.Threading;
- namespace ShapeDetect
- {
- /// <summary>
- /// 形状识别
- /// </summary>
- public partial class MainWindow : Window
- {
- //定义检测模式
- int IMAGE_MODE = 1, VIDEO_MODE = 2;
- private AutoResetEvent exitEvent;
- private Thread m_thread;
- //导入动态链接库
- [DllImport("HoughCircles_DLL.dll")]
- //检测圆
- public static extern System.UIntPtr HoughCircles([MarshalAs(UnmanagedType.LPStr)]string address, int detect_mode);
- [DllImport("SquareDetect_DLL.dll")]
- //检测矩形
- public static extern void SquareDetector([MarshalAs(UnmanagedType.LPStr)]string address, int detect_mode);
- public MainWindow()
- {
- InitializeComponent();
- }
- private void Window_Loaded(object sender, RoutedEventArgs e)
- {
- GetIni();
- imgCheckBtn.IsChecked = true;
- circleCheckBtn.IsChecked = true;
- }
- //获取ini配置文件信息
- private void GetIni()
- {
- ini_RW.FileName = System.Windows.Forms.Application.StartupPath + "\\Config.ini";
- this.videoAddress.Text = ini_RW.ReadIni("VideoUrl", "videourl", "");
- this.ipAddress.Text = ini_RW.ReadIni("ControlUrl", "controlUrl", "");
- this.portBox.Text = ini_RW.ReadIni("ControlPort", "controlPort", "");
- }
- //修改配置
- private void setBtn_Click(object sender, RoutedEventArgs e)
- {
- ini_RW.WriteIni("VideoUrl", "videourl", this.videoAddress.Text);
- ini_RW.WriteIni("ControlUrl", "controlUrl", this.ipAddress.Text);
- ini_RW.WriteIni("ControlPort", "controlPort", this.portBox.Text);
- System.Windows.MessageBox.Show("配置成功!请重启程序以使配置生效。", "配置信息", MessageBoxButton.OK, MessageBoxImage.Information);
- //this.Close();
- }
- //计数清零
- private void BoxClean()
- {
- circleTextBox.Text = "0";
- recTextBox.Text = "0";
- }
- //打开图片地址
- private void imgBtn_Click(object sender, RoutedEventArgs e)
- {
- try
- {
- BoxClean();
- //WPF中,OpenFileDialog位于Microsoft.Win32名称空间
- Microsoft.Win32.OpenFileDialog dialog = new Microsoft.Win32.OpenFileDialog();
- dialog.Filter = "All files (*.*)|*.*|jpg files (*.jpg)|*.jpg|png files(*.png)|*.png";
- if (dialog.ShowDialog() == true)
- {
- string path = dialog.FileName;
- imgAddressBox.Text = path;
- }
- }
- catch { };
- }
- //检测形状判断
- private void ShapeDetect(string address, int mode)
- {
- if (circleCheckBtn.IsChecked == true)
- {
- //System.Windows.MessageBox.Show("检测圆形");
- circleTextBox.Text = HoughCircles(address, mode).ToString();
- }
- else if (recCheckBtn.IsChecked == true)
- {
- //System.Windows.MessageBox.Show("检测矩形");
- SquareDetector(address, mode);
- }
- }
- //图片检测
- private void imgDetect()
- {
- if (imgAddressBox.Text == string.Empty)
- {
- System.Windows.MessageBox.Show(
- "图片地址为空,请选择一张图片", "警告",
- MessageBoxButton.OK,
- MessageBoxImage.Information
- );
- return;
- }
- else
- {
- ShapeDetect(imgAddressBox.Text, IMAGE_MODE);
- }
- }
- //视频检测
- private void videoDetect()
- {
- try
- {
- while (true)
- {
- this.Dispatcher.Invoke(
- new Action(
- delegate
- {
- string ip = this.videoAddress.Text;
- ShapeDetect(ip, VIDEO_MODE);
- }
- ));
- }
- }
- catch { };
- }
- //判断检测为图片还是视频,开启形状检测
- private void detectBtn_Click(object sender, RoutedEventArgs e)
- {
- BoxClean();
- if (imgCheckBtn.IsChecked == true)
- {
- imgDetect();
- }
- else if (videoCheckBtn.IsChecked == true)
- {
- try
- {
- m_thread = new Thread(new ThreadStart(videoDetect));
- m_thread.Start();
- }
- catch { };
- }
- }
- //按esc键退出视频检测,结束线程
- private void Window_KeyDown(object sender, System.Windows.Input.KeyEventArgs e)
- {
- if (e.Key == Key.Escape)
- {
- exitEvent.Set();
- m_thread.Join();
- }
- }
- }
- }
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程序识别圆形及矩形两种形状,包括对图像以及视频中的物体的形状检测,可参考上面的演示视频进行操作。图片中物体的形状识别,文末资料下载中提供一张测试图片,然后选择图片按钮,选择要检测的圆形或者矩形,点击形状检测。
视频中的形状识别,选择视频按钮,选择要检测的圆形或者矩形,点击形状检测,可以使用球体或者矩形状物体进行检测。
4. 资料下载
资料内容:
①识别形状-例程源代码
②测试图片.jpg
资料下载地址:https://www.robotway.com/h-col-200.html
想了解更多机器人开源项目资料请关注 机器谱网站 https://www.robotway.com
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