c# 利用AForge和百度AI开发实时人脸识别
2021-02-19 11:17
baiduAIFaceIdentify项目是C#语言,集成百度AI的SDK利用AForge开发的实时人脸识别的小demo,里边包含了人脸检测识别,人脸注册,人脸登录等功能
人脸实时检测识别功能
思路是利用AForge打开摄像头,通过摄像头获取到的图像显示在winform窗体中AForge的控件中,利用AForge控件中的NewFrame事件获取要显示的每一帧的图像,获取图像传输到百度AI平台进行人脸检测,并且将检测结果反馈到界面显示的图像中。在这个过程中有两个问题,获取图像上传到百度AI平台进行分析需要时间,这个时间跟网络有关,所以需要单独一个线程进行人脸识别,第二个问题,百度人脸识别接口开发者一秒内只能掉用2次接口,所以需要控制不是每一帧的图像都要上传。所以基于以上思路
首先页面初始化的时候获取视频设备、启动一个单独线程控制1秒内人脸检测的次数:
private void Form1_Load(object sender, EventArgs e) { /// 获取电脑已经安装的视频设备 videoDevices = new FilterInfoCollection(FilterCategory.VideoInputDevice); if (videoDevices!=null && videoDevices.Count>0) { foreach (FilterInfo device in videoDevices) { comboBox1.Items.Add(device.Name); } comboBox1.SelectedIndex = 0; } videoSourcePlayer1.NewFrame += VideoSourcePlayer1_NewFrame; // 开发者在百度AI平台人脸识别接口只能1秒中调用2次,所以需要做 定时开始检测,每个一秒检测2次 ThreadPool.QueueUserWorkItem(new WaitCallback(p => { while (true) { IsStart = true; Thread.Sleep(500); } })); }
其次,在NewFrame的回调方法中,根据IsStart判断是否要开始人脸识别,并且另外启动一个线程进行人脸识别操作,判断如果已经有识别过的结构,根据返回的人脸的位置,在当前的一帧图像中绘制方框指示出识别出的人脸位置
private void VideoSourcePlayer1_NewFrame(object sender, ref Bitmap image) { try { if (IsStart) { IsStart = false; // 在线程池中另起一个线程进行人脸检测,这样不会造成界面视频卡顿现象 ThreadPool.QueueUserWorkItem(new WaitCallback(this.Detect), image.Clone()); } if (location != null) { try { // 绘制方框套住人脸 Graphics g = Graphics.FromImage(image); g.DrawLine(new Pen(Color.Black), new System.Drawing.Point(location.left, location.top), new System.Drawing.Point(location.left + location.width, location.top)); g.DrawLine(new Pen(Color.Black), new System.Drawing.Point(location.left, location.top), new System.Drawing.Point(location.left, location.top + location.height)); g.DrawLine(new Pen(Color.Black), new System.Drawing.Point(location.left, location.top + location.height), new System.Drawing.Point(location.left + location.width, location.top + location.height)); g.DrawLine(new Pen(Color.Black), new System.Drawing.Point(location.left + location.width, location.top), new System.Drawing.Point(location.left + location.width, location.top + location.height)); g.Dispose(); } catch (Exception ex) { ClassLoger.Error("VideoSourcePlayer1_NewFrame", ex); } } } catch (Exception ex) { ClassLoger.Error("VideoSourcePlayer1_NewFrame1", ex); } }
人脸注册。
在一些类似刷脸签到、刷脸登录的应用场景中,根据人脸获取人物信息,前提就是人脸注册,人脸注册就是获取当前摄像头的一帧图像,调用百度AI的人脸注册接口进行注册
// 用户ID string uid = "1"; // 用户资料,长度限制256B string userInfo = textBox6.Text.Trim(); // 用户组ID string groupId = textBox5.Text.Trim(); if (comboBox1.Items.Count 0) { MessageBox.Show("请插入视频设备"); return; } try { if (videoSourcePlayer1.IsRunning) { BitmapSource bitmapSource = System.Windows.Interop.Imaging.CreateBitmapSourceFromHBitmap( videoSourcePlayer1.GetCurrentVideoFrame().GetHbitmap(), IntPtr.Zero, Int32Rect.Empty, BitmapSizeOptions.FromEmptyOptions()); var img = BitmapSource2Byte(bitmapSource); var options = new Dictionarystring, object>{ {"action_type", "replace"} }; var result = client.UserAdd(uid, userInfo, groupId, img, options); if (result.ToString().Contains("error_code")) { MessageBox.Show("注册失败:" + result.ToString()); } else { MessageBox.Show("注册成功"); } } } catch (Exception ex) { MessageBox.Show("摄像头异常:" + ex.Message); }
人脸登录
人脸登录和人脸注册的方式一样,只不过调用的是百度AI的人脸登录接口
// 用户ID string uid = "1"; // 用户资料,长度限制256B string userInfo = textBox6.Text.Trim(); // 用户组ID string groupId = textBox5.Text.Trim(); if (comboBox1.Items.Count 0) { MessageBox.Show("请插入视频设备"); return; } try { if (videoSourcePlayer1.IsRunning) { BitmapSource bitmapSource = System.Windows.Interop.Imaging.CreateBitmapSourceFromHBitmap( videoSourcePlayer1.GetCurrentVideoFrame().GetHbitmap(), IntPtr.Zero, Int32Rect.Empty, BitmapSizeOptions.FromEmptyOptions()); var img = BitmapSource2Byte(bitmapSource); // 如果有可选参数 //var options = new Dictionary{ // {"ext_fields", "faceliveness"}, // {"user_top_num", 3} //}; var result = client.Identify(groupId, img); FaceIdentifyInfo info = JsonHelper.DeserializeObject(result.ToString()); if (info!=null && info.result!=null && info.result.Length>0) { textBox7.Text = info.result[0].user_info; } } } catch (Exception ex) { MessageBox.Show("摄像头异常:" + ex.Message); }
源码地址:https://github.com/liemei/baiduAIFaceIdentify
文章标题:c# 利用AForge和百度AI开发实时人脸识别
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