public OpencvSource(string cam_or_url)
{
MAssert.Check(cam_or_url != string.Empty);
// check if cam_or_url is number
bool stream = false;
for (int i = 0; i < cam_or_url.Length; ++i)
{
stream = stream ||
(cam_or_url[i] < '0') ||
(cam_or_url[i] > '9');
}
if (stream)
{
// open stream
Console.WriteLine("opening stream '{0}'", cam_or_url);
capturer = new OpenCvSharp.VideoCapture(cam_or_url);
}
else
{
// convert to integer
int cam_id = Convert.ToInt32(cam_or_url, 10);
MAssert.Check(cam_id >= 0, "wrong webcam id");
// open vebcam
Console.WriteLine("opening webcam {0}", cam_id);
capturer = new OpenCvSharp.VideoCapture(cam_id);
MAssert.Check(capturer.IsOpened(), "webcam not opened");
// set resolution
capturer.Set(OpenCvSharp.CaptureProperty.FrameWidth, 1280);
capturer.Set(OpenCvSharp.CaptureProperty.FrameHeight, 720);
MAssert.Check(capturer.IsOpened(), "webcam not opened");
}
// sometimes first few frames can be empty even if camera is good
// so skip few frames
OpenCvSharp.Mat frame;
for (int i = 0; i < 10; ++i)
{
frame = capturer.RetrieveMat();
}
// check first two frames
OpenCvSharp.Mat image1 = new OpenCvSharp.Mat(), image2 = new OpenCvSharp.Mat();
capturer.Read(image1);
capturer.Read(image2);
Console.WriteLine("image1 size: {0}", image1.Size());
Console.WriteLine("image1 size: {0}", image2.Size());
MAssert.Check(
!image1.Empty() &&
!image2.Empty() &&
image1.Size() == image2.Size() &&
image1.Type() == OpenCvSharp.MatType.CV_8UC3 &&
image2.Type() == OpenCvSharp.MatType.CV_8UC3,
"error opening webcam or stream");
}
private async Task CaptureCamera(CancellationToken token)
{
if (capture == null)
{
capture = new cv.VideoCapture(0, cv.VideoCaptureAPIs.ANY);
}
capture.Open(0);
if (capture.IsOpened())
{
try
{
while (!token.IsCancellationRequested)
{
using MemoryStream memoryStream = capture.RetrieveMat().ToMemoryStream();
await Application.Current.Dispatcher.InvokeAsync(() =>
{
try
{
var imageSource = new BitmapImage();
imageSource.BeginInit();
imageSource.CacheOption = BitmapCacheOption.OnLoad;
imageSource.StreamSource = memoryStream;
imageSource.EndInit();
img_WebCam.Source = imageSource;
}catch (Exception e)
{
}
});
bitmapImage = new Bitmap(memoryStream);
//await ParseWebCamFrame(bitmapImage, token);
}
capture.Release();
}
catch (Exception e)
{
}
}
}
private async Task CaptureCamera(CancellationToken token)
{
if (capture == null)
{
capture = new OpenCvSharp.VideoCapture(CaptureDevice.DShow);
}
capture.Open(0);
m_capture.Start();
if (capture.IsOpened())
// if(m_capture.IsOpened)
{
while (!token.IsCancellationRequested)
{
using MemoryStream memoryStream = capture.RetrieveMat().Flip(FlipMode.Y).ToMemoryStream();
// using MemoryStream memoryStream = m_capture.QueryFrame()..RetrieveMat().Flip(FlipMode.Y).ToMemoryStream();
await Application.Current.Dispatcher.InvokeAsync(() =>
{
var imageSource = new BitmapImage();
imageSource.BeginInit();
imageSource.CacheOption = BitmapCacheOption.OnLoad;
imageSource.StreamSource = memoryStream;
imageSource.EndInit();
OpenCVSharpImageSource.Source = imageSource;
});
var bitmapImage = new Bitmap(memoryStream);
await ParseWebCamFrame(bitmapImage, token);
}
capture.Release();
}
}
static void Main(string[] args)
{
//var vc = new OpenCvSharp.VideoCapture("./test/india.mp4");
//var vc = new OpenCvSharp.VideoCapture("./test/Test.mov");
//var vc = new OpenCvSharp.VideoCapture("./test/singleTest.m4v");
//var vc = new OpenCvSharp.VideoCapture("./test/peopleTest.m4v");
var vc = new OpenCvSharp.VideoCapture();
vc.Open(1);
ImageRecognizer imageRecognizer = new ImageRecognizer();
int key = int.MinValue;
using (Window window = new Window("capture"))
{
while (key < 0)
{
vc.Grab();
var mat = vc.RetrieveMat();
if (mat.Empty())
{
return;
}
var faces = imageRecognizer.DetectFaces(mat);
if (faces != null)
{
foreach (var face in faces)
{
var faceCrop = new Mat(mat, face);
faceCrop.SaveImage($"./results/{Guid.NewGuid()}.jpg");
}
}
window.ShowImage(mat);
key = Cv2.WaitKey(10);
}
}
}
