1、 sessionView - 相机画面的容器View self.detector - 脸部特征识别器
- (void)viewDidLoad {
[super viewDidLoad];
self.sessionView = [[UIView alloc] initWithFrame:self.view.bounds];
[self.view addSubview:self.sessionView];
self.faceView = [[UIImageView alloc] initWithImage:[UIImage imageNamed:@"a"]];
self.faceView.frame = CGRectZero;
[self.view addSubview:self.faceView];
self.leftEyeView = [[UIView alloc] init];
self.leftEyeView.alpha = 0.4;
self.leftEyeView.backgroundColor = [UIColor greenColor];
[self.view addSubview:self.leftEyeView];
self.rightEyeView = [[UIView alloc] init];
self.rightEyeView.alpha = 0.4;
self.rightEyeView.backgroundColor = [UIColor yellowColor];
[self.view addSubview:self.rightEyeView];
self.mouthView = [[UIView alloc] init];
self.mouthView.alpha = 0.4;
self.mouthView.backgroundColor = [UIColor redColor];
[self.view addSubview:self.mouthView];
self.context = [CIContext context];
self.detector = [CIDetector detectorOfType:CIDetectorTypeFace context:self.context options:@{CIDetectorAccuracy:CIDetectorAccuracyHigh}];
}
2、点击屏幕任意地方打开相机
- (void)touchesBegan:(NSSet<UITouch *> *)touches withEvent:(UIEvent *)event {
// 避免重复打开，首先关闭原先的session
[self.session stopRunning];
self.session = [[AVCaptureSession alloc] init];
// 移除原有的相机画面Layer
[self.layer removeFromSuperlayer];
NSError *error;
// Device
NSArray *devices = [AVCaptureDevice devices];
NSLog(@"devices = %@", devices);
AVCaptureDevice *defaultDevice = [AVCaptureDevice defaultDeviceWithMediaType:AVMediaTypeVideo];
// Input
AVCaptureDeviceInput *input = [AVCaptureDeviceInput deviceInputWithDevice:defaultDevice error:&error];
[self.session addInput:input];
// Output
AVCaptureVideoDataOutput *output = [[AVCaptureVideoDataOutput alloc] init];
[output setSampleBufferDelegate:(id)self queue:dispatch_get_global_queue(DISPATCH_QUEUE_PRIORITY_HIGH, 0)];
[self.session addOutput:output];
// 开始捕获相机画面
[self.session startRunning];
// 将相机画面添加到容器View中
self.layer = [AVCaptureVideoPreviewLayer layerWithSession:self.session];
self.layer.frame = self.view.bounds;
[self.sessionView.layer addSublayer:self.layer];
}
3、脸部特征跟踪
// AVCaptureAudioDataOutputSampleBufferDelegate
- (void)captureOutput:(AVCaptureOutput *)captureOutput didOutputSampleBuffer:(CMSampleBufferRef)sampleBuffer fromConnection:(AVCaptureConnection *)connection {
// printf("%s\n", __func__);
// 1、获取当前帧图像
CVImageBufferRef imageBuffer = CMSampleBufferGetImageBuffer(sampleBuffer);
CIImage *image = [[CIImage alloc] initWithCVImageBuffer:imageBuffer];
CGFloat imageW = image.extent.size.width;
CGFloat imageH = image.extent.size.height;
2、对图像进行脸部特征识别
CIFeature *feature = [[self.detector featuresInImage:image] lastObject];
if (feature) {
if (self.leftEyeView.frame.size.width == 0) {
self.leftEyeView.frame = CGRectMake(0, 0, 20, 20);
}
if (self.rightEyeView.frame.size.width == 0) {
self.rightEyeView.frame = CGRectMake(0, 0, 20, 20);
}
if (self.mouthView.frame.size.width == 0) {
self.mouthView.frame = CGRectMake(0, 0, 20, 20);
}
NSLog(@"find");
CIFaceFeature *face = (CIFaceFeature *)feature;
dispatch_async(dispatch_get_main_queue(), ^{
self.faceView.frame = CGRectMake(face.bounds.origin.y / imageW * self.sessionView.frame.size.height,
face.bounds.origin.x / imageH * self.sessionView.frame.size.width,
face.bounds.size.width / imageH * self.sessionView.frame.size.width,
face.bounds.size.height / imageW * self.sessionView.frame.size.height);
self.leftEyeView.center = CGPointMake(face.leftEyePosition.y / imageW * self.sessionView.frame.size.height,
face.leftEyePosition.x / imageH * self.sessionView.frame.size.width);
self.rightEyeView.center = CGPointMake(face.rightEyePosition.y / imageW * self.sessionView.frame.size.height,
face.rightEyePosition.x / imageH * self.sessionView.frame.size.width);
self.mouthView.center = CGPointMake(face.mouthPosition.y / imageW * self.sessionView.frame.size.height,
face.mouthPosition.x / imageH * self.sessionView.frame.size.width);
});
}
}
#大功告成 手机记得横过来，home键在右边 Demo地址：github.com/MagicBlind/…
