您好,登錄后才能下訂單哦!
項(xiàng)目中用到 USB 攝像頭,需要根據(jù)情況進(jìn)行圖像抓拍,查了半天資料,比較多的是使用 WPFMediaKit 和 AForge 。
但是由于項(xiàng)目要求不顯示 USB 攝像頭拍攝的畫(huà)面,最終確定使用 AForge 解決。
下面用一個(gè)測(cè)試程序記錄一下。
一、無(wú)預(yù)覽拍照
首先建立一個(gè) WPF 項(xiàng)目,我的就叫 AForgeTest,你們隨意就好:
然后在 NuGet 包管理器中安裝 AForge 庫(kù):
我只安裝了圖中打勾的幾個(gè)庫(kù),這個(gè)根據(jù)自己項(xiàng)目需要安裝就好。
不過(guò)用 USB 攝像頭拍照必須安裝:
AForge.Video
AForge.Control
AForge.Video.DirectShow
這三個(gè)庫(kù)文件。
不習(xí)慣使用 NuGet 也可以到 AForge 的 .NET lib 下載頁(yè)面下載。
在 MainWindow.xaml 文件中添加兩個(gè)按鈕:
<Window x:Class="AForgeTest.MainWindow" xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation" xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml" xmlns:d="http://schemas.microsoft.com/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">打開(kāi)</Button> </StackPanel> </Window>
后臺(tái)交互邏輯如下:
using System; using System.Windows; namespace AForgeTest { /// <summary> /// MainWindow.xaml 的交互邏輯 /// </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.ComponentModel.CancelEventArgs e) { CameraHelper.CloseDevice(); } } }
CameraHelper 類(lèi)代碼如下:
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設(shè)置為true后,是否設(shè)置了其他的sourcePlayer,若未設(shè)置則_isDisplay重設(shè)為false private static bool isSet = false; /// <summary> /// 獲取或設(shè)置攝像頭設(shè)備,無(wú)設(shè)備為null /// </summary> public static FilterInfoCollection CameraDevices { get { return _cameraDevices; } set { _cameraDevices = value; } } /// <summary> /// 指示是否顯示攝像頭視頻畫(huà)面 /// 默認(rèn)false /// </summary> public static bool IsDisplay { get { return _isDisplay; } set { _isDisplay = value; } } /// <summary> /// 獲取或設(shè)置VideoSourcePlayer控件, /// 只有當(dāng)IsDisplay設(shè)置為true時(shí),該屬性才可以設(shè)置成功 /// </summary> public static VideoSourcePlayer SourcePlayer { get { return sourcePlayer; } set { if (_isDisplay) { sourcePlayer = value; isSet = true; } } } /// <summary> /// 更新攝像頭設(shè)備信息 /// </summary> public static void UpdateCameraDevices() { _cameraDevices = new FilterInfoCollection(FilterCategory.VideoInputDevice); } /// <summary> /// 設(shè)置使用的攝像頭設(shè)備 /// </summary> /// <param name="index">設(shè)備在CameraDevices中的索引</param> /// <returns><see cref="bool"/></returns> public static bool SetCameraDevice(int index) { if (!isSet) _isDisplay = false; //無(wú)設(shè)備,返回false if (_cameraDevices.Count <= 0 || index < 0) return false; if (index > _cameraDevices.Count - 1) return false; // 設(shè)定初始視頻設(shè)備 div = new VideoCaptureDevice(_cameraDevices[index].MonikerString); sourcePlayer.VideoSource = div; div.Start(); sourcePlayer.Start(); return true; } /// <summary> /// 截取一幀圖像并保存 /// </summary> /// <param name="filePath">圖像保存路徑</param> /// <param name="fileName">保存的圖像文件名</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> /// 關(guān)閉攝像頭設(shè)備 /// </summary> public static void CloseDevice() { if (div != null && div.IsRunning) { sourcePlayer.Stop(); div.SignalToStop(); div = null; _cameraDevices = null; } } } }
最終效果如下:
首先單擊打開(kāi)按鈕,然后單擊拍照按鈕,就會(huì)在指定路徑下生成一個(gè) jpg 文件。
單擊打開(kāi)按鈕之后需要等待 2s 以上才能點(diǎn)擊拍照(需要等待連接到攝像頭),否則會(huì)報(bào)出異常,如下圖:
二、顯示攝像頭拍攝畫(huà)面和截取的圖片
首先添加 System.Windows.Forms 和 WindowsFormsIntegration 的引用。
然后在 MainWindows.xmal 文件中加命名空間:
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"/>
這里有個(gè)小細(xì)節(jié),注意對(duì) VideoSourcePlayer 命名時(shí),一定要使用 x:Name 不要省略 x: ,否則無(wú)法在后臺(tái)代碼中使用(不要問(wèn)我是怎么知道的)。
對(duì) CameraHelper.cs 中的 CaptureImage 函數(shù)做一點(diǎn)修改:
/// <summary> /// 截取一幀圖像并保存 /// </summary> /// <param name="filePath">圖像保存路徑</param> /// <param name="fileName">保存的圖像文件名</param> /// <returns>如果保存成功,則返回完整路徑,否則為 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.Combine(filePath, fileName + "-cap.jpg"); bitmap.Save(fullPath, ImageFormat.Jpeg); bitmap.Dispose(); return fullPath; } catch (Exception e) { MessageBox.Show(e.Message.ToString()); return null; } }
修改后臺(tái)代碼如下:
using System; using System.Windows; using System.Windows.Media.Imaging; namespace AForgeTest { /// <summary> /// MainWindow.xaml 的交互邏輯 /// </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.ComponentModel.CancelEventArgs e) { CameraHelper.CloseDevice(); } } }
最終結(jié)果如下:
以上就是本文的全部?jī)?nèi)容,希望對(duì)大家的學(xué)習(xí)有所幫助,也希望大家多多支持億速云。
免責(zé)聲明:本站發(fā)布的內(nèi)容(圖片、視頻和文字)以原創(chuàng)、轉(zhuǎn)載和分享為主,文章觀點(diǎn)不代表本網(wǎng)站立場(chǎng),如果涉及侵權(quán)請(qǐng)聯(lián)系站長(zhǎng)郵箱:is@yisu.com進(jìn)行舉報(bào),并提供相關(guān)證據(jù),一經(jīng)查實(shí),將立刻刪除涉嫌侵權(quán)內(nèi)容。