OpenCVSharp 获取笔记本摄像头 学习笔记
众所周知，Opencv是一款功能强大的图像智能处理类库，但是对于c++与opecv的初学者来说，是不容易快速掌握的
最近网上搜索资料得知，OpencvSharp类库对于C# 的学习者来说是一个绝对的利好消息。但是查了下这方面的资源网
上并不是很多。有的资源也有许多值得改进的地方。废话不多说 ，转入正题。
1.打开vs2017，菜单：文件》新建
2.文件结构如下：
3.导入nuget包
3.1打开nuget包管理器
3.2 搜索并安装OpenCvSharp3-AnyCPU
4.1添加所需要的控件
一个用于动态显示事件的标签：LabelTime
一个用于动态获取摄像头的图片框：
pictureBox1 宽：640，高：480（注意：要与获取摄像头属性值宽高保持一致，否则会图片显示异常.）
5 为了节省大家的时间，直接上代码
5.1 MainFrm后台代码
using System;
using System.Windows.Forms;
namespace OpenCameraWithOpencvSharp
{
public partial class MainFrm : Form
{
/// 时间管理变量
private TimeManager TimeManager_MF;
/// 打开摄像头并动态显示图片到图片框的业务逻辑类
private OpenCamera OpenCamera;
public MainFrm()
{
InitializeComponent();
}
private void MainFrm_Load(object sender, EventArgs e)
{
TimeManager_MF = new TimeManager(LabelTime);
//更新时间方法
TimeManager_MF.TimeWorkForFromLoad();
OpenCamera = new OpenCamera(pictureBox1);
//动态加载图片到 pictureBox1
OpenCamera.UpdatePictrueImage();
}
}
}
5.2时间管理类代码
using System;
using System.Threading;
using System.Windows.Forms;
namespace OpenCameraWithOpencvSharp
{
///
///时间管理类
///
public class TimeManager
{
///
/// 更新时间线程方法的委托
///
private delegate void SetTimeThreadDelegate();
///
/// 更新时间线程的回调方法
///
private SetTimeThreadDelegate SetTimeThreadCallBack;
private delegate void UpdateTimeDelegate(string text);
private UpdateTimeDelegate UpdateTimeCallBack;
///
/// 布尔变量用于更新时间线程方法
///
internal bool TimeBegin = true;
///
/// 用于获取时间标签
///
public Label LabelTime { get; private set; }
public TimeManager(Label label)
{
LabelTime = label;
}
public TimeManager()
{
}
///
/// 用于窗体加载时间中的方法
///
internal void TimeWorkForFromLoad()
{
//声明更新时间线程回调
SetTimeThreadCallBack = new SetTimeThreadDelegate(SetTimeForCallBack);
//
UpdateTimeCallBack = new UpdateTimeDelegate(UpdateTime);
//更新时间线程
Thread thread = new Thread(new ThreadStart(SetTimeThreadCallBack))
{
IsBackground = true
};
thread.Start();
Thread.Sleep(40);
}
///
/// 更新时间回调方法
///
private void SetTimeForCallBack()
{
while (TimeBegin)
{
if (LabelTime.InvokeRequired)
{
LabelTime.Invoke(UpdateTimeCallBack, new object[] { DateTime.Now.ToString() });
}
}
}
///
/// 更新时间方法
///
///
private void UpdateTime(string time)
{
LabelTime.Text = time;
}
}
}
5.3 获取摄像头并更新图片类
using System;
using System.Drawing;
using System.Threading;
using OpenCvSharp;
using OpenCvSharp.Extensions;
using System.Windows.Forms;
namespace OpenCameraWithOpencvSharp
{
///
/// 打开摄像头并动态显示图片到图片框的业务逻辑类
///
public class OpenCamera
{
//更新图片线程用的委托回调变量
internal delegate void UpdateImageDelegate();
internal UpdateImageDelegate UpdateImageThreadCallBack_OC;
///
/// 用于获取
internal static PictureBox PictureBox { set; get; }
///
/// 用于获取或存储摄像头设备变量
///
internal static VideoCapture VideoCapture_OS;
public OpenCamera()
{
}
///
/// 构造方法，用于传递
///
public OpenCamera(PictureBox pictureBox)
{
PictureBox = pictureBox;
}
public void UpdatePictrueImage()
{
try
{
UpdateImageThreadCallBack_OC = new UpdateImageDelegate(UpdateImage);
//跟新图片线程
Thread thread = new Thread(new ThreadStart(UpdateImageThreadCallBack_OC))
{
IsBackground = true
};
thread.Start();
Thread.Sleep(40);
}
catch (Exception)
{
throw new Exception() ;
}
}
///
/// 更新图片方法，用于
private void UpdateImage()
{
while (true)
{
VideoCapture_OS = InitVideoCapture();
Mat mat = new Mat();
if (VideoCapture_OS.Read(mat))
{
Image image =(Image) mat.ToBitmap();
PictureBox.Image = image;
}
}
}
///
/// 初始化摄像头并设置摄像头宽高参数
///
/// 摄像头调用对象
private static VideoCapture InitVideoCapture()
{
if (VideoCapture_OS==null)
{
VideoCapture_OS = OpenCvSharp.VideoCapture.FromCamera(CaptureDevice.Any);
VideoCapture_OS.Set(CaptureProperty.FrameWidth, 640);
VideoCapture_OS.Set(CaptureProperty.FrameHeight, 480);
}
return VideoCapture_OS;
}
}
}
5.5 MainFrm 前台代码
namespace OpenCameraWithOpencvSharp
{
partial class MainFrm
{
///
/// Required designer variable.
///
private System.ComponentModel.IContainer components = null;
///
/// Clean up any resources being used.
///
/// true if managed resources should be disposed; otherwise, false.
protected override void Dispose(bool disposing)
{
if (disposing && (components != null))
{
components.Dispose();
}
base.Dispose(disposing);
}
#region Windows Form Designer generated code
///
/// Required method for Designer support - do not modify
/// the contents of this method with the code editor.
///
private void InitializeComponent()
{
this.LabelTime = new System.Windows.Forms.Label();
this.pictureBox1 = new System.Windows.Forms.PictureBox();
((System.ComponentModel.ISupportInitialize)(this.pictureBox1)).BeginInit();
this.SuspendLayout();
//
// LabelTime
//
this.LabelTime.AutoSize = true;
this.LabelTime.Font = new System.Drawing.Font("宋体", 14F);
this.LabelTime.Location = new System.Drawing.Point(204, 10);
this.LabelTime.Name = "LabelTime";
this.LabelTime.Size = new System.Drawing.Size(0, 19);
this.LabelTime.TabIndex = 0;
//
// pictureBox1
//
this.pictureBox1.Location = new System.Drawing.Point(46, 45);
this.pictureBox1.Name = "pictureBox1";
this.pictureBox1.Size = new System.Drawing.Size(640, 480);
this.pictureBox1.TabIndex = 1;
this.pictureBox1.TabStop = false;
//
// MainFrm
//
this.AutoScaleDimensions = new System.Drawing.SizeF(6F, 12F);
this.AutoScaleMode = System.Windows.Forms.AutoScaleMode.Font;
this.ClientSize = new System.Drawing.Size(800, 537);
this.Controls.Add(this.pictureBox1);
this.Controls.Add(this.LabelTime);
this.Name = "MainFrm";
this.Text = "OpenCvSharpOpenCamera";
this.Load += new System.EventHandler(this.MainFrm_Load);
((System.ComponentModel.ISupportInitialize)(this.pictureBox1)).EndInit();
this.ResumeLayout(false);
this.PerformLayout();
}
#endregion
private System.Windows.Forms.Label LabelTime;
private System.Windows.Forms.PictureBox pictureBox1;
}
}
6.测试结果
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