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
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);
}
}
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 Dictionary<string, 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<string, object>{
// {"ext_fields", "faceliveness"},
// {"user_top_num", 3}
//};
var result = client.Identify(groupId, img);
FaceIdentifyInfo info = JsonHelper.DeserializeObject<FaceIdentifyInfo>(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);
}
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