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November 16, 2020 20:19
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net5opencvdacedetcascades.cs
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using System; | |
using System.Threading; | |
using System.Windows.Forms; | |
using OpenCvSharp; | |
using OpenCvSharp.Extensions; | |
using Point = OpenCvSharp.Point; | |
using Size = OpenCvSharp.Size; | |
namespace Demo07_WinFormFaceDetectionCascades | |
{ | |
public partial class Form1 : Form | |
{ | |
private bool _run = true; | |
private bool _doFaceDetection = false; | |
private VideoCapture _capture; | |
private Mat _image; | |
private Thread _cameraThread; | |
private bool _fps = false; | |
private CascadeClassifier _faceCascade; | |
public Form1() | |
{ | |
InitializeComponent(); | |
Load += Form1_Load; | |
Closed += Form1_Closed; | |
} | |
private void Form1_Closed(object sender, EventArgs e) | |
{ | |
_cameraThread.Interrupt(); | |
_capture.Release(); | |
} | |
private void btnStart_Click(object sender, EventArgs e) | |
{ | |
_run = true; | |
} | |
private void btnStop_Click(object sender, EventArgs e) | |
{ | |
_run = false; | |
} | |
private void btnFaceDetectionCascades_Click(object sender, EventArgs e) | |
{ | |
_doFaceDetection = !_doFaceDetection; | |
} | |
private void buttonFPS_Click(object sender, EventArgs e) | |
{ | |
_fps = !_fps; | |
} | |
private void Form1_Load(object sender, EventArgs e) | |
{ | |
_faceCascade = new CascadeClassifier(); | |
_faceCascade.Load("haarcascade_frontalface_default.xml"); | |
_capture = new VideoCapture(0); | |
_image = new Mat(); | |
_cameraThread = new Thread(new ThreadStart(CaptureCameraCallback)); | |
_cameraThread.Start(); | |
} | |
private void CaptureCameraCallback() | |
{ | |
while (true) | |
{ | |
if (!_run) continue; | |
var startTime = DateTime.Now; | |
_capture.Read(_image); | |
if (_image.Empty()) return; | |
var imageRes = new Mat(); | |
Cv2.Resize(_image, imageRes, new Size(320, 240)); | |
var newImage = imageRes.Clone(); | |
if (_doFaceDetection) | |
{ | |
using var gray = new Mat(); | |
Cv2.CvtColor(newImage, gray, ColorConversionCodes.BGR2GRAY); | |
var faces = _faceCascade.DetectMultiScale(gray, 1.3, 5); | |
foreach (var face in faces) | |
{ | |
Cv2.Rectangle(newImage, face, Scalar.Red); | |
Cv2.PutText(newImage, "Face Cascade", new Point(face.Left + 2, face.Top + face.Width + 20), | |
HersheyFonts.HersheyComplexSmall, 1, Scalar.Red, 2); | |
} | |
} | |
if (_fps) | |
{ | |
var diff = DateTime.Now - startTime; | |
var fpsInfo = $"FPS: Nan"; | |
if (diff.Milliseconds > 0) | |
{ | |
var fpsVal = 1.0 / diff.Milliseconds * 1000; | |
fpsInfo = $"FPS: {fpsVal:00}"; | |
} | |
Cv2.PutText(newImage, fpsInfo, new Point(10, 20), HersheyFonts.HersheyComplexSmall, 1, Scalar.White); | |
} | |
var bmpWebCam = BitmapConverter.ToBitmap(imageRes); | |
var bmpEffect = BitmapConverter.ToBitmap(newImage); | |
pictureBoxWebCam.Image = bmpWebCam; | |
pictureBoxEffect.Image = bmpEffect; | |
} | |
} | |
} | |
} |
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