WPF实现可视化扫码器的示例代码
作者:黑夜中的潜行者
AForge.NET 是一个专门为开发者和研究者基于C#框架设计的,他包括计算机视觉与人工智能,图像处理,神经网络,遗传算法,机器学习,模糊系统,机器人控制等领域。本文就将用它编写一个可视化扫码器,感兴趣的可以了解一下
概述
以识别粤康码识别为例。现在的深圳进出小区、商场、办公楼、乘坐公共交通工具等都需要出示并扫描健康码,也被称之为“电子哨兵”。不多说那个用的是一般的扫码枪。
摄像头调度
调度摄像头选择使用 AForge.NET
AForge.NET 是一个专门为开发者和研究者基于C#框架设计的,他包括计算机视觉与人工智能,图像处理,神经网络,遗传算法,机器学习,模糊系统,机器人控制等领域。AForge.Net 是C#的一个图像计算机视觉库,该库是一个开源项目,提供很多图像的处理,和视频处理功能。
官方地址:http://www.aforgenet.com/
需要引入三个NuGet包:
- AForge
- AForge.Video
- AForge.Video.DirectShow
如何使用这里先不介绍,后面有完整代码
二维码识别
需要的NuGet包:ZXing.Net
ZXing.Net 是由 Google ZXing 移植并优化改进而来的。
Google ZXing 是目前一个常用的基于Java实现的多种格式的1D/2D条码图像处理库。
这支持的编码方式种类相对齐全,并且支持可移植库。
如何使用这里先不介绍,后面有完整代码
源代码
<Window x:Class="HealthCodeIdentification.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:local="clr-namespace:HealthCodeIdentification" xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006" Title="MainWindow" Width="800" Height="450" WindowStartupLocation="CenterScreen" mc:Ignorable="d"> <Grid Background="AliceBlue"> <Grid.ColumnDefinitions> <ColumnDefinition /> <ColumnDefinition /> </Grid.ColumnDefinitions> <StackPanel Grid.Column="0" Margin="10" VerticalAlignment="Center"> <TextBlock x:Name="txtTips" Margin="0,10" HorizontalAlignment="Center" /> <Image x:Name="imageVideo" /> </StackPanel> <Grid Grid.Column="1" Margin="10"> <Grid.RowDefinitions> <RowDefinition /> <RowDefinition /> </Grid.RowDefinitions> <TextBox x:Name="txtInfo" BorderThickness="0" TextWrapping="Wrap" /> <TextBlock x:Name="txtCodeColor" Grid.Row="1" FontSize="32"> <TextBlock.Style> <Style TargetType="TextBlock"> <Style.Triggers> <Trigger Property="Text" Value="绿码"> <Setter Property="Foreground" Value="#0d0" /> </Trigger> <Trigger Property="Text" Value="黄码"> <Setter Property="Foreground" Value="Yellow" /> </Trigger> <Trigger Property="Text" Value="红码"> <Setter Property="Foreground" Value="Red" /> </Trigger> </Style.Triggers> </Style> </TextBlock.Style> </TextBlock> </Grid> </Grid> </Window>
using AForge.Video.DirectShow; using Newtonsoft.Json; using System; using System.Drawing; using System.Drawing.Imaging; using System.IO; using System.Threading; using System.Threading.Tasks; using System.Windows; using System.Windows.Media.Imaging; using ZXing; namespace HealthCodeIdentification { /// <summary> /// MainWindow.xaml 的交互逻辑 /// </summary> public partial class MainWindow : Window { private FilterInfoCollection _videoDevices; private VideoCaptureDevice _videoSource; public MainWindow() { InitializeComponent(); Loaded += MainWindow_Loaded; Closed += MainWindow_Closed; } private void MainWindow_Loaded(object sender, RoutedEventArgs e) { OpenVideoCaptureDevice(); } private void MainWindow_Closed(object sender, EventArgs e) { if (_videoSource is null) return; _videoSource.SignalToStop(); } /// <summary> /// 查找并打开摄像头 /// </summary> private void OpenVideoCaptureDevice() { _videoDevices = new FilterInfoCollection(FilterCategory.VideoInputDevice); if (_videoDevices.Count > 0) { _videoSource = new VideoCaptureDevice(_videoDevices[0].MonikerString); _videoSource.NewFrame += _camera_NewFrame; _videoSource.Start(); txtTips.Text = "AI扫描已启动,请将健康码对准摄像头"; return; } MessageBox.Show("请连接摄像头!", "提示", MessageBoxButton.OK, MessageBoxImage.Warning); } /// <summary> /// 加载视频 /// </summary> /// <param name="sender"></param> /// <param name="eventArgs"></param> private async void _camera_NewFrame(object sender, AForge.Video.NewFrameEventArgs eventArgs) { var image = eventArgs.Frame.Clone(); Image videoImage = (Bitmap)image; Bitmap bitmapImage = (Bitmap)image; //image.RotateFlip(RotateFlipType.RotateNoneFlipX); // 设置图像旋转 Graphics g = Graphics.FromImage(videoImage); //SolidBrush brush = new SolidBrush(Color.Red); //g.DrawString($"时间:{DateTime.Now:yyyy年MM月dd日 HH时mm分ss秒}", new Font("Arial", 18), brush, new PointF(5, 5)); //brush.Dispose(); //g.Dispose(); MemoryStream ms = new MemoryStream(); videoImage.Save(ms, ImageFormat.Bmp); ms.Seek(0, SeekOrigin.Begin); BitmapImage bi = new BitmapImage(); bi.BeginInit(); bi.StreamSource = ms; bi.EndInit(); bi.Freeze(); await Dispatcher.BeginInvoke(new ThreadStart(async delegate { imageVideo.Source = bi; await QRCodeReader(bitmapImage); })); } private async Task<Task> QRCodeReader(Bitmap bitmap) { await Dispatcher.BeginInvoke(new ThreadStart(delegate { BarcodeReader barcodeReader = new BarcodeReader(); var result = barcodeReader.Decode(bitmap); if (result != null) { txtInfo.Text = result.ToString(); if (result.ToString().StartsWith("{")) { var data = JsonConvert.DeserializeObject<CodeData>(result.ToString()); switch (data.c.ToUpper()) { case "G": txtCodeColor.Text = "绿码"; break; case "Y": txtCodeColor.Text = "黄码"; break; case "R": txtCodeColor.Text = "红码"; break; } } } })); return Task.CompletedTask; } } public class CodeData { public string label { get; set; } public string cid { get; set; } public string cidtype { get; set; } public string name { get; set; } public string phone { get; set; } public string encode { get; set; } /// <summary> /// 颜色,绿码G,黄码Y,红码R /// </summary> public string c { get; set; } public string t { get; set; } public string v { get; set; } public string s { get; set; } } }
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