现功能:
播放视频
提取每一帧图片并保存
显示视频播放的时间
videowrite 视频保存的方法还未调试成功,等待后续再继续研究!
//----------------------------------------------------------------------------
// Copyright (C) 2004-2019 by EMGU Corporation. 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.CvEnum;
using Emgu.CV.Structure;
using Emgu.Util;
using System.Threading;
namespace CameraCapture
{
public partial class CameraCapture : Form
{
private VideoCapture _capture = null;
private bool _captureInProgress;
private Mat _frame, _frame1;
private Mat _grayFrame;
private Mat _smallGrayFrame;
private Mat _smoothedGrayFrame;
private Mat _cannyFrame;
private double FrameRate;
private int cam,count;
Bitmap bmp;
//VideoWriter _Wvideo;
//private Image<Bgr, byte> frame = new Image<Bgr, byte>("你好.jpg");
//参考链接 https://blog.csdn.net/cuoban/article/details/50555953
public CameraCapture()
{
InitializeComponent();
Control.CheckForIllegalCrossThreadCalls = false;//加入这句话,不过治标不治本
//使用显卡处理图像数据效率会很多,如果你的设备支持,最好打开,使用CvInvoke.HaveOpenCLCompatibleGpuDevice能返回是否支持.
// 配置CvInvoke.UseOpenCL能让OpenCV 启用或者停用 GPU运算
//CvInvoke.UseOpenCL = CvInvoke.HaveOpenCLCompatibleGpuDevice;
CvInvoke.UseOpenCL = false;
count = 0;
try
{
//构造一个摄像头实例,如果调用本地摄像机则括号里面为空
_capture = new VideoCapture(@"C:\Users\Administrator\Desktop\video\vtest.avi");
_capture.ImageGrabbed += ProcessFrame;//图像捕捉事件
double TotalFrames = _capture.GetCaptureProperty(Emgu.CV.CvEnum.CapProp.FrameCount);
_capture.SetCaptureProperty(Emgu.CV.CvEnum.CapProp.FrameHeight, 96);
_capture.SetCaptureProperty(Emgu.CV.CvEnum.CapProp.FrameWidth, 128);//FrameWidth=3视频流的帧宽度(只对摄像头有效)
// FrameRate = _capture.GetCaptureProperty(Emgu.CV.CvEnum.CAP_PROP.CV_CAP_PROP_FPS);
FrameRate = _capture.GetCaptureProperty(Emgu.CV.CvEnum.CapProp.Fps);//帧率
// MessageBox.Show(FrameRate.ToString());
cam = 0;
}
catch (NullReferenceException excpt)
{
MessageBox.Show(excpt.Message);
}
_frame = new Mat();
_frame1 = new Mat();
_grayFrame = new Mat();
_smallGrayFrame = new Mat();
_smoothedGrayFrame = new Mat();
_cannyFrame = new Mat();
}
private void ProcessFrame(object sender, EventArgs arg)
{
/* if (_capture != null && _capture.Ptr != IntPtr.Zero)
// if (_capture != null)
{
_capture.Retrieve(_frame, 0); //_capture.RetrieveBgrFrame(); 老版本写法 得到捕捉到的帧数据。
// _frame1 = _capture.QueryFrame();
// pictureBox1.Image = _frame1.ToBitmap();
CvInvoke.CvtColor(_frame, _grayFrame, ColorConversion.Bgr2Gray);
CvInvoke.PyrDown(_grayFrame, _smallGrayFrame);
//进行高斯向下采样,执行高斯金字塔分解步骤向下采样。固定原图像,
//删除指定行和列(可以全为奇数行和列,或者偶数行和列...),从而减小图像的宽度和高度。
CvInvoke.PyrUp(_smallGrayFrame, _smoothedGrayFrame);
//执行高斯金字塔分解向上采样,首先透过注入固定行和列0像素值,在通过插值算法,对插入行列进行插值,这样用于放大原图像的四倍。
//参数解析:IInputArraysrc:输入图像,即原图像。IOutputArraydst:输出图像,采样后得到的图像。
CvInvoke.Canny(_smoothedGrayFrame, _cannyFrame, 100, 60);
//多级边缘检测算法
captureImageBox.Image = _frame;
grayscaleImageBox.Image = _grayFrame;
smoothedGrayscaleImageBox.Image = _smoothedGrayFrame;
cannyImageBox.Image = _cannyFrame;*/
try
{
Double Framesno = _capture.GetCaptureProperty(Emgu.CV.CvEnum.CapProp.PosFrames);
_capture.Retrieve(_frame, 0);
if (_frame != null)
{
//pictureBox1.Image = _frame.Bitmap;
captureImageBox.Image = _frame;
Thread.Sleep((int)(1000.0 / FrameRate));
//保存图片
bmp = new Bitmap(_frame.Bitmap);
bmp.Save(@"D:\image\"+count+".jpg", System.Drawing.Imaging.ImageFormat.Jpeg);
bmp.Dispose();
count++;
// _Wvideo = new VideoWriter(@"D:\image\1.avi", -1,10,new Size(_frame.Cols, _frame.Rows),true);
if (cam == 0)
{
int Video_seek = (int)(Framesno);
double time_index = _capture.GetCaptureProperty(Emgu.CV.CvEnum.CapProp.PosMsec);
label5.Text = "Time: " + TimeSpan.FromMilliseconds(time_index).ToString().Substring(0, 8);
// double framenumber = _capture.GetCaptureProperty(Emgu.CV.CvEnum.CAP_PROP.CV_CAP_PROP_POS_FRAMES);
// Frame_lbl.Text = "Frame: " + framenumber.ToString();
}
if (cam == 1)
{
//Frame_lbl.Text = "Frame: " + (webcam_frm_cnt++).ToString();
}
}
}
catch (Exception ex)
{
MessageBox.Show(ex.Message.ToString());
}
}
private void captureButtonClick(object sender, EventArgs e)
{
if (_capture != null)
{
if (_captureInProgress)
{ //stop the capture
captureButton.Text = "Start Capture";
_capture.Pause();
}
else
{
//start the capture
captureButton.Text = "Stop";
_capture.Start();
}
_captureInProgress = !_captureInProgress;
}
}
//Dispose意为释放,释放组件所占用的内存。
//C#特性,为提高运行效率,自动会释放已使用过且不再需要使用的组件来减少程序的CPU使用率。
//默认会在程序运行一段时间后自动加载该Dispose方法,或者可以显式的自行调用此方法。
private void ReleaseData()
{
if (_capture != null)
_capture.Dispose();
}
private void FlipHorizontalButtonClick(object sender, EventArgs e)
{
// 得到和设置Capture类是否进行水平翻转。
if (_capture != null) _capture.FlipHorizontal = !_capture.FlipHorizontal;
}
private void FlipVerticalButtonClick(object sender, EventArgs e)
{
if (_capture != null) _capture.FlipVertical = !_capture.FlipVertical;
}
}
}
要显示视频播放的时间可以以下两种方式:
初始化代码中加: Control.CheckForIllegalCrossThreadCalls = false;//加入这句话,不过治标不治本 视频播放还可以用
使用委托:SetText("Time: " + TimeSpan.FromMilliseconds(time_index).ToString().Substring(0, 8));
private delegate void SetTextDelegate(string value);private void SetText(string value) {if (this.InvokeRequired) { SetTextDelegate d = new SetTextDelegate(SetText);object arg = (object)value;//要传入的参数值this.Invoke(d, arg);//这里参数不对。 }else {this.label5.Text = value; } }
QueryFrame() 去实现
//----------------------------------------------------------------------------
// Copyright (C) 2004-2019 by EMGU Corporation. 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.CvEnum;
using Emgu.CV.Structure;
using Emgu.Util;
using System.Threading;
namespace WindowsFormsApplication40
{
public partial class Form1 : Form
{
private VideoCapture _capture = null;
private Mat _frame;
private double FrameRate;
//private Image<Bgr, byte> frame = new Image<Bgr, byte>("你好.jpg");
//参考链接 https://blog.csdn.net/cuoban/article/details/50555953
public Form1()
{
InitializeComponent();
//使用显卡处理图像数据效率会很多,如果你的设备支持,最好打开,使用CvInvoke.HaveOpenCLCompatibleGpuDevice能返回是否支持.
// 配置CvInvoke.UseOpenCL能让OpenCV 启用或者停用 GPU运算
//CvInvoke.UseOpenCL = CvInvoke.HaveOpenCLCompatibleGpuDevice;
CvInvoke.UseOpenCL = false;
try
{
Application.Idle += Application_Idle;
//构造一个摄像头实例,如果调用本地摄像机则括号里面为空
//Application.Idle += new EventHandler(Application_Idle);//也可以
_capture = new VideoCapture(@"C:\Users\Administrator\Desktop\video\vtest.avi");
double TotalFrames = _capture.GetCaptureProperty(Emgu.CV.CvEnum.CapProp.FrameCount);
FrameRate = _capture.GetCaptureProperty(Emgu.CV.CvEnum.CapProp.Fps);//帧率
}
catch (NullReferenceException excpt)
{
MessageBox.Show(excpt.Message);
}
}
private void Application_Idle(object sender, EventArgs e)
{
try
{
_frame = _capture.QueryFrame();
if (_frame != null)
{
System.Threading.Thread.Sleep((int)(1000.0 / FrameRate - 5));
pictureBox1.Image = _frame.Bitmap;
GC.Collect();
}
}
catch (Exception ex)
{
MessageBox.Show(ex.Message.ToString());
}
}
//Dispose意为释放,释放组件所占用的内存。
//C#特性,为提高运行效率,自动会释放已使用过且不再需要使用的组件来减少程序的CPU使用率。
//默认会在程序运行一段时间后自动加载该Dispose方法,或者可以显式的自行调用此方法。
private void ReleaseData()
{
if (_capture != null)
_capture.Dispose();
}
}
}
项目拓展:
点击按钮选择需要播放的视频进行播放
//----------------------------------------------------------------------------
// Copyright (C) 2004-2019 by EMGU Corporation. 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.CvEnum;
using Emgu.CV.Structure;
using Emgu.Util;
using System.Threading;
namespace WindowsFormsApplication40
{
public partial class Form1 : Form
{
private VideoCapture _capture = null;
private Mat _frame;
private double FrameRate;
//private Image<Bgr, byte> frame = new Image<Bgr, byte>("你好.jpg");
//参考链接 https://blog.csdn.net/cuoban/article/details/50555953
public Form1()
{
InitializeComponent();
//使用显卡处理图像数据效率会很多,如果你的设备支持,最好打开,使用CvInvoke.HaveOpenCLCompatibleGpuDevice能返回是否支持.
// 配置CvInvoke.UseOpenCL能让OpenCV 启用或者停用 GPU运算
//CvInvoke.UseOpenCL = CvInvoke.HaveOpenCLCompatibleGpuDevice;
CvInvoke.UseOpenCL = false;
try
{
// Application.Idle += Application_Idle;
//Application.Idle += new EventHandler(Application_Idle);
//构造一个摄像头实例,如果调用本地摄像机则括号里面为空
// _capture = new VideoCapture(@"C:\Users\Administrator\Desktop\video\vtest.avi");
// double TotalFrames = _capture.GetCaptureProperty(Emgu.CV.CvEnum.CapProp.FrameCount);
//FrameRate = _capture.GetCaptureProperty(Emgu.CV.CvEnum.CapProp.Fps);//帧率
}
catch (NullReferenceException excpt)
{
MessageBox.Show(excpt.Message);
}
}
private void Application_Idle(object sender, EventArgs e)
{
try
{
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