/// <summary>
/// 持续检测一次人脸，直到停止。
/// </summary>
/// <param name="token">取消标记</param>
private async void StartDetector(CancellationToken token)
{
List <double> fpsList = new List <double>();
double fps = 0;
Stopwatch stopwatchFPS = new Stopwatch();
Stopwatch stopwatch = new Stopwatch();
while (VideoPlayer.IsRunning && !token.IsCancellationRequested)
{
if (CheckBoxFPS.Checked)
{
stopwatch.Restart();
if (!stopwatchFPS.IsRunning)
{
stopwatchFPS.Start();
}
}
Bitmap bitmap = VideoPlayer.GetCurrentVideoFrame(); // 获取摄像头画面
if (bitmap != null)
{
FaceRectangles.Clear(); Ages.Clear(); Pids.Clear();
if (CheckBoxDetect.Checked)
{
var infos = await ViewFace.FaceTrackAsync(bitmap); // 识别画面中的人脸
foreach (var info in infos)
{
FaceRectangles.Add(info.Location);
Pids.Add(info.Pid);
if (CheckBoxFaceProperty.Checked)
{
Ages.Add(await ViewFace.FaceAgePredictorAsync(bitmap, await ViewFace.FaceMarkAsync(bitmap, new ViewFaceCore.Sharp.Model.FaceInfo()
{
Location = info.Location, Score = info.Score
})));
Gender.Add((await ViewFace.FaceGenderPredictorAsync(bitmap, await ViewFace.FaceMarkAsync(bitmap, new ViewFaceCore.Sharp.Model.FaceInfo()
{
Location = info.Location, Score = info.Score
}))).ToDescription());
}
}
}
else
{
await Task.Delay(1000 / 60);
}
using (Graphics g = Graphics.FromImage(bitmap))
{
if (FaceRectangles.Any()) // 如果有人脸，在 bitmap 上绘制出人脸的位置信息
{
g.DrawRectangles(new Pen(Color.Red, 4), FaceRectangles.ToArray());
if (CheckBoxDetect.Checked && CheckBoxFaceProperty.Checked)
{
string pid = "";
for (int i = 0; i < FaceRectangles.Count; i++)
{
if (Pids.Any())
{
pid = $"| Pid: {Pids[i]}";
}
g.DrawString($"{Ages[i]} 岁 | {Gender[i]} {pid}", new Font("微软雅黑", 24), Brushes.Green, new PointF(FaceRectangles[i].X + FaceRectangles[i].Width + 24, FaceRectangles[i].Y));
}
}
}
if (CheckBoxFPS.Checked)
{
stopwatch.Stop();
if (numericUpDownFPSTime.Value > 0)
{
fpsList.Add(1000f / stopwatch.ElapsedMilliseconds);
if (stopwatchFPS.ElapsedMilliseconds >= numericUpDownFPSTime.Value)
{
fps = fpsList.Average();
fpsList.Clear();
stopwatchFPS.Reset();
}
}
else
{
fps = 1000f / stopwatch.ElapsedMilliseconds;
}
g.DrawString($"{fps:#.#} FPS", new Font("微软雅黑", 24), Brushes.Green, new Point(10, 10));
}
}
}
else
{
await Task.Delay(10);
}
FacePictureBox.Image?.Dispose();
FacePictureBox.Image = bitmap;
}
VideoPlayer?.SignalToStop();
VideoPlayer?.WaitForStop();
if (IsClose)
{
Close();
}
}
