iOS中的OpenCV - 停止相机后最后帧延迟10-15秒

Question

停止相机后，最后一帧延迟10-15秒。我该如何解决？

...     
[self.videoCamera stop]; // after this last frame remains within 10 sec
...

- (void)viewDidLoad {
     [super viewDidLoad];

     // Start OpenCV camera
     self.videoCamera = [[CvVideoCamera alloc] initWithParentView:_imageView];
     self.videoCamera.delegate = self;
     self.videoCamera.defaultAVCaptureDevicePosition = AVCaptureDevicePositionFront;
     self.videoCamera.defaultAVCaptureSessionPreset = AVCaptureSessionPresetPhoto;
    self.videoCamera.defaultAVCaptureVideoOrientation = AVCaptureVideoOrientationPortrait;
    [self.videoCamera start];
}

Answer 1

我在Change Lable text from OpenCV ProcessImage method on iOS找到了答案。我忘记了这个过程是在后台进行的