项目中用到 usb 摄像头,需要根据情况进行图像抓拍,查了半天资料,比较多的是使用 wpfmediakit 和 aforge 。
但是由于项目要求不显示 usb 摄像头拍摄的画面,最终确定使用 aforge 解决。
下面用一个测试程序记录一下。
一、无预览拍照
首先建立一个 wpf 项目,我的就叫 aforgetest,你们随意就好:
然后在 nuget 包管理器中安装 aforge 库:
我只安装了图中打勾的几个库,这个根据自己项目需要安装就好。
不过用 usb 摄像头拍照必须安装:
aforge.video
aforge.control
aforge.video.directshow
这三个库文件。
不习惯使用 nuget 也可以到 aforge 的 .net lib 下载页面下载。
在 mainwindow.xaml 文件中添加两个按钮:
< window x:class = "aforgetest.mainwindow"
xmlns = "http://schemas.microsoft测试数据/winfx/2006/xaml/presentation"
xmlns:x = "http://schemas.microsoft测试数据/winfx/2006/xaml"
xmlns:d = "http://schemas.microsoft测试数据/expression/blend/2008"
xmlns:mc = "http://schemas.openxmlformats.org/markup-compatibility/2006"
xmlns:local = "clr-namespace:aforgetest"
mc:ignorable = "d"
title = "mainwindow" height = "300" width = "300"
closing = "window_closing" >
< stackpanel >
< button name = "btncapture" click = "btncapture_click" >拍照</ button >
< button name = "btnopencamera" click = "btnopencamera_click" >打开</ button >
</ stackpanel >
</ window >
后台交互逻辑如下:
using system;
using system.windows;
namespace aforgetest
{
/// <summary>
/// mainwindow.xaml 的交互逻辑
/// </summary>
public partial class mainwindow : window
{
public mainwindow()
{
initializecomponent();
}
private void btnopencamera_click( object sender, eventargs e)
{
camerahelper.updatecameradevices();
if (camerahelper.cameradevices.count > 0)
{
camerahelper.setcameradevice(0);
}
}
private void btncapture_click( object sender, eventargs e)
{
camerahelper.captureimage( @"e:\1" );
}
private void window_closing( object sender, system测试数据ponentmodel.canceleventargs e)
{
camerahelper.closedevice();
}
}
}
camerahelper 类代码如下:
using system;
using aforge.video.directshow;
using aforge.controls;
using system.windows;
using system.io;
using system.drawing;
using system.drawing.imaging;
namespace aforgetest
{
public static class camerahelper
{
private static filterinfocollection _cameradevices;
private static videocapturedevice div = null ;
private static videosourceplayer sourceplayer = new videosourceplayer();
private static bool _isdisplay = false ;
//指示_isdisplay设置为true后,是否设置了其他的sourceplayer,若未设置则_isdisplay重设为false
private static bool isset = false ;
/// <summary>
/// 获取或设置摄像头设备,无设备为null
/// </summary>
public static filterinfocollection cameradevices
{
get
{
return _cameradevices;
}
set
{
_cameradevices = value;
}
}
/// <summary>
/// 指示是否显示摄像头视频画面
/// 默认false
/// </summary>
public static bool isdisplay
{
get { return _isdisplay; }
set { _isdisplay = value; }
}
/// <summary>
/// 获取或设置videosourceplayer控件,
/// 只有当isdisplay设置为true时,该属性才可以设置成功
/// </summary>
public static videosourceplayer sourceplayer
{
get { return sourceplayer; }
set
{
if (_isdisplay)
{
sourceplayer = value;
isset = true ;
}
}
}
/// <summary>
/// 更新摄像头设备信息
/// </summary>
public static void updatecameradevices()
{
_cameradevices = new filterinfocollection(filtercategory.videoinputdevice);
}
/// <summary>
/// 设置使用的摄像头设备
/// </summary>
/// <param name="index">设备在cameradevices中的索引</param>
/// <returns><see cref="bool"/></returns>
public static bool setcameradevice( int index)
{
if (!isset) _isdisplay = false ;
//无设备,返回false
if (_cameradevices.count <= 0 || index < 0) return false ;
if (index > _cameradevices.count - 1) return false ;
// 设定初始视频设备
div = new videocapturedevice(_cameradevices[index].monikerstring);
sourceplayer.videosource = div;
div.start();
sourceplayer.start();
return true ;
}
/// <summary>
/// 截取一帧图像并保存
/// </summary>
/// <param name="filepath">图像保存路径</param>
/// <param name="filename">保存的图像文件名</param>
public static void captureimage( string filepath, string filename = null )
{
if (sourceplayer.videosource == null ) return ;
if (!directory.exists(filepath))
{
directory.createdirectory(filepath);
}
try
{
//sourceplayer.start();
image bitmap = sourceplayer.getcurrentvideoframe();
if (filename == null ) filename = datetime.now.tostring( "yyyy-mm-dd-hh-mm-ss" );
bitmap.save(filepath + @"\" + filename + "-cap.jpg", imageformat.jpeg);
bitmap.dispose();
//sourceplayer.stop();
}
catch (exception e)
{
messagebox.show(e.message.tostring());
}
}
/// <summary>
/// 关闭摄像头设备
/// </summary>
public static void closedevice()
{
if (div != null && div.isrunning)
{
sourceplayer.stop();
div.signaltostop();
div = null ;
_cameradevices = null ;
}
}
}
}
最终效果如下:
首先单击打开按钮,然后单击拍照按钮,就会在指定路径下生成一个 jpg 文件。
单击打开按钮之后需要等待 2s 以上才能点击拍照(需要等待连接到摄像头),否则会报出异常,如下图:
二、显示摄像头拍摄画面和截取的图片
首先添加 system.windows.forms 和 windowsformsintegration 的引用。
然后在 mainwindows.xmal 文件中加命名空间:
xmlns:wfi ="clr-namespace:system.windows.forms.integration;assembly=windowsformsintegration"
xmlns:aforge ="clr-namespace:aforge.controls;assembly=aforge.controls"12
添加 videosourceplayer 和 image 控件:
< wfi:windowsformshost grid.row = "0" >
< aforge:videosourceplayer x:name = "player" height = "480" width = "640" />
</ wfi:windowsformshost >
< image grid.row = "0" grid.column = "1" name = "imgcapture" stretch = "fill" height = "480" width = "640" />
这里有个小细节,注意对 videosourceplayer 命名时,一定要使用 x:name 不要省略 x: ,否则无法在后台代码中使用(不要问我是怎么知道的)。
对 camerahelper.cs 中的 captureimage 函数做一点修改:
/// <summary>
/// 截取一帧图像并保存
/// </summary>
/// <param name="filepath">图像保存路径</param>
/// <param name="filename">保存的图像文件名</param>
/// <returns>如果保存成功,则返回完整路径,否则为 null</returns>
public static string captureimage( string filepath, string filename = null )
{
if (sourceplayer.videosource == null ) return null ;
if (!directory.exists(filepath))
{
directory.createdirectory(filepath);
}
try
{
image bitmap = sourceplayer.getcurrentvideoframe();
if (filename == null ) filename = datetime.now.tostring( "yyyy-mm-dd-hh-mm-ss" );
string fullpath = path测试数据bine(filepath, filename + "-cap.jpg" );
bitmap.save(fullpath, imageformat.jpeg);
bitmap.dispose();
return fullpath;
}
catch (exception e)
{
messagebox.show(e.message.tostring());
return null ;
}
}
修改后台代码如下:
using system;
using system.windows;
using system.windows.media.imaging;
namespace aforgetest
{
/// <summary>
/// mainwindow.xaml 的交互逻辑
/// </summary>
public partial class mainwindow : window
{
public mainwindow()
{
initializecomponent();
camerahelper.isdisplay = true ;
camerahelper.sourceplayer = player;
camerahelper.updatecameradevices();
}
private void btnopencamera_click( object sender, eventargs e)
{
if (camerahelper.cameradevices.count > 0)
{
camerahelper.setcameradevice(0);
}
}
private void btncapture_click( object sender, eventargs e)
{
string fullpath = camerahelper.captureimage(appdomain.currentdomain.basedirectory + @"\capture" );
bitmapimage bit = new bitmapimage();
bit.begininit();
bit.urisource = new uri(fullpath);
bit.endinit();
imgcapture.source = bit;
}
private void window_closing( object sender, system测试数据ponentmodel.canceleventargs e)
{
camerahelper.closedevice();
}
}
}
最终结果如下:
以上就是本文的全部内容,希望对大家的学习有所帮助,也希望大家多多支持服务器之家。
原文链接:https://blog.csdn.net/luo_5458/article/details/74452534
dy("nrwz");
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