HSmartWindowControl 之摄像头实时显示( 使用 WPF )

1、添加Halcon控件，创建WPF项目

在VS2013中创建一个WPF工程，然后添加halcon的控件和工具包，参见：

HSmartWindowControl之安装篇 (Visual Studio 2013 & Halcon 18）

在WPF工程中添加好HSmartWindowControlWPF控件后，将其拖入主窗体即可。

2、生成摄像头实时显示的halcon代码

使用Image Acquisition 连接笔记本自带的摄像头，然后生成实时显示的代码即可：

* Image Acquisition 01: Code generated by Image Acquisition 01

open_framegrabber ('DirectShow', 1, 1, 0, 0, 0, 0, 'default', 8, 'rgb', -1, 'false', 'default', '[0] Integrated Camera', 0, -1, AcqHandle)

grab_image_start (AcqHandle, -1)

while (true)

    grab_image_async (Image, AcqHandle, -1)

    * Image Acquisition 01: Do something

endwhile

3、导出C#代码

这里主要关注action函数：

// Main procedure

  private void action()

  {

    // Local iconic variables

    HObject ho_Image=null;

    // Local control variables

    HTuple hv_AcqHandle = new HTuple();

    // Initialize local and output iconic variables

    HOperatorSet.GenEmptyObj(out ho_Image);

    //Image Acquisition 01: Code generated by Image Acquisition 01

    //Image Acquisition 01: Attention: The initialization may fail in case parameters need to

    //Image Acquisition 01: be set in a specific order (e.g., image resolution vs. offset).

    hv_AcqHandle.Dispose();

    HOperatorSet.OpenFramegrabber("DirectShow", 1, 1, 0, 0, 0, 0, "default", 8, "rgb",

        -1, "false", "default", "[0] Integrated Camera", 0, -1, out hv_AcqHandle);

    HOperatorSet.GrabImageStart(hv_AcqHandle, -1);

    while ((int)(1) != 0)

    {

      ho_Image.Dispose();

      HOperatorSet.GrabImageAsync(out ho_Image, hv_AcqHandle, -1);

      //Image Acquisition 01: Do something

    }

    ho_Image.Dispose();

    hv_AcqHandle.Dispose();

  }

这段代码只是实现了采集图像，没有在界面上显示。

4、向VS项目添加halcon导出的c#代码

向action()的代码中添加在窗口上显示图像的代码，即使用DispObj函数。然后把action添加到按钮响应中执行。

这样点击按钮之后就会进入死循环不停的GrabImage和DispObj，但是实际操作时界面会停止响应，而且图像并不会在窗口内刷新。

5、添加实时显示子线程

主线程中运行循环无法实时显示，必须创建子线程。

这里使用了工作者线程，点击按钮后，启动线程并执行一个循环显示采集的图像；再次点击按钮时，跳出循环结束worker线程。然后继续点击按钮又可以进入子线程开启实时显示，实现随意启停。

private void Button1_Click(object sender, RoutedEventArgs e)

        {

            if (isCameraOpened == false)

            {

                Button1.Content = "关闭实时显示";

                isCameraOpened = true;

                play_Thread = new Thread(action);

                play_Thread.Start();

            }

            else

            {

                Button1.Content = "开启实时显示";

                isCameraOpened = false;

            }

        }

注意调用线程需添加引用：

using System.Threading;//多线程

需要注意的是，为了防止在实时显示过程中突然关闭窗体导致程序崩溃，在窗体的Un_load事件中加入强行停止子线程的代码。

private void Window_Unloaded(object sender, RoutedEventArgs e)

        {

            if(play_Thread.IsAlive)

            {

                play_Thread.Abort();

            }

        }

6、调整图像尺寸以适应halconwindow窗口

（1）使用HSmartWindowControlWPF控件时，无需再添加鼠标滚轮的响应函数便可使用鼠标滚轮控制图像缩放。

（2）显示单张图像时，可以直接向HSmartWindowControlWPF控件的HDisplayCurrentObject属性赋HObject类型的图像即可自动调整图像尺寸来适应窗口大小。

hSmartWindowControl1.HDisplayCurrentObject = new HImage("girl.png");

但是这个方式不能适用于动态捕获的图像，所以动态捕获的图像还需要手动判断来进行缩放。调整的方式比较简单，就是获取窗口尺寸和图像尺寸进行对比，根据图像过宽还是过高来缩放。

7、源代码

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 HalconDotNet;

using System.Threading;//多线程

namespace HalconWindowWPFDemo

{

    /// <summary>

    /// Interaction logic for MainWindow.xaml

    /// </summary>

    public partial class MainWindow : Window

    {

        #region 全局变量

        private static MainWindow mainWindow = new MainWindow();

        private static HWindow hwindow; //全局窗口变量

        Thread play_Thread; //实时显示线程

        private static bool isCameraOpened; //是否正在实时显示

        private static double halconWindowHeight; //halcon窗口高度

        private static double halconWindowWidth; ////halcon窗口宽度

        #endregion

        #region 初始化

        public MainWindow()

        {

            InitializeComponent();

        }

        private void Window_Loaded(object sender, RoutedEventArgs e)

        {

            hwindow = hSmartWindowControl1.HalconWindow;//初始化窗口变量

            isCameraOpened = false;

            //获取halcon窗口大小

            halconWindowHeight = mainWindow.hSmartWindowControl1.WindowSize.Width;

            halconWindowWidth = mainWindow.hSmartWindowControl1.WindowSize.Height;

        }

        #endregion

        #region 界面响应

        /// <summary>

        /// 开启和关闭实时显示按钮

        /// </summary>

        /// <param name="sender"></param>

        /// <param name="e"></param>

        private void Button1_Click(object sender, RoutedEventArgs e)

        {

            if (isCameraOpened == false)

            {

                Button1.Content = "关闭实时显示";

                isCameraOpened = true;

                play_Thread = new Thread(action);

                play_Thread.Start();

            }

            else

            {

                Button1.Content = "开启实时显示";

                isCameraOpened = false;

            }

        }

        /// <summary>

        /// 显示一张图片

        /// </summary>

        /// <param name="sender"></param>

        /// <param name="e"></param>

        private void Button2_Click(object sender, RoutedEventArgs e)

        {

            hSmartWindowControl1.HDisplayCurrentObject = new HImage("girl.png");

        }

        #endregion

        #region 实时显示用函数

        /// <summary>

        /// 摄像头实时显示

        /// </summary>

        private static void action()

        {

            // Local iconic variables

            HObject ho_Image = null;

            // Local control variables

            HTuple hv_AcqHandle = new HTuple();

            // Initialize local and output iconic variables

            HOperatorSet.GenEmptyObj(out ho_Image);

            ho_Image.Dispose();

            hv_AcqHandle.Dispose();

            //Image Acquisition 01: Code generated by Image Acquisition 01

            HOperatorSet.OpenFramegrabber("DirectShow", 1, 1, 0, 0, 0, 0, "default", 8, "rgb",

                -1, "false", "default", "[0] Integrated Camera", 0, -1, out hv_AcqHandle);

            HOperatorSet.GrabImageStart(hv_AcqHandle, -1);                 

            while (isCameraOpened)

            {

                HOperatorSet.GrabImageAsync(out ho_Image, hv_AcqHandle, -1);

                if (!mainWindow.ShowHalconImage(ho_Image)) break;

            }

            ho_Image.Dispose();

            hv_AcqHandle.Dispose();

        }

        /// <summary>

        /// 显示图像

        /// </summary>

        /// <param name="image"></param>

        /// <returns></returns>

        private bool ShowHalconImage(HObject ho_Image)

        {

            #region 缩放图像，适应窗口

            //获取图像大小及纵横比

            HTuple hv_Width = new HTuple(), hv_Height = new HTuple();

            HOperatorSet.GetImageSize(ho_Image, out hv_Width, out hv_Height);

            int im_width = int.Parse(hv_Width.ToString());

            int im_height = int.Parse(hv_Height.ToString());

            double im_AspectRatio = (double)(im_width) / (double)(im_height);

            //获取窗口大小及纵横比

            double w_AspectRatio = halconWindowWidth / halconWindowHeight;

            HOperatorSet.SetSystem("int_zooming", "false");//图像缩放之前最好将此参数设置为false.

            HTuple para = new HTuple("constant");

            HObject ho_zoomImage;

            HOperatorSet.GenEmptyObj(out ho_zoomImage);

            ho_zoomImage.Dispose();

            if (halconWindowWidth < im_width && im_AspectRatio > w_AspectRatio)

            {

                //超宽图像

                HOperatorSet.ZoomImageSize(ho_Image, out ho_zoomImage, halconWindowWidth, halconWindowWidth / im_AspectRatio, "constant");

            }

            else if (halconWindowHeight < im_height && im_AspectRatio < w_AspectRatio)

            {

                //超高图像

                HOperatorSet.ZoomImageSize(ho_Image, out ho_zoomImage, halconWindowHeight * im_AspectRatio, halconWindowHeight, para);

            }

            #endregion

            #region 显示图像

            try

            {

                hwindow.SetPart(0, 0, -2, -2);

                hwindow.DispObj(ho_zoomImage);

            }

            catch (Exception exp)

            {

                //MessageBox.Show(exp.ToString());

                return false;

            }

            #endregion

            return true;

        }

        #endregion

        #region 析构函数

        /// <summary>

        /// 关闭窗体时推出子线程，防止崩溃

        /// </summary>

        /// <param name="sender"></param>

        /// <param name="e"></param>

        private void Window_Unloaded(object sender, RoutedEventArgs e)

        {

            if(play_Thread.IsAlive)

            {

                play_Thread.Abort();

            }

        }

        #endregion

    }

}

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HSmartWindowControl 之摄像头实时显示( 使用 WPF )

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巴特西

HSmartWindowControl 之 摄像头实时显示( 使用 WPF )

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HSmartWindowControl 之摄像头实时显示( 使用 WPF )