人脸识别

- (void)viewDidLoad {

    [super viewDidLoad];

    UIImage *aImage = [UIImage imageNamed:@"证件照.jpg"];

    

    UIImageView *imageView = [[UIImageView alloc]initWithFrame:CGRectMake(0, 0, 120, 160)];

    imageView.center = self.view.center;

    imageView.layer.borderWidth = 1.0;

    imageView.layer.masksToBounds = YES;

    //自适应图片宽高比例

    imageView.contentMode = UIViewContentModeScaleAspectFit;

    imageView.image = aImage;

    [self.view addSubview:imageView];

    

    CIImage* image = [CIImage imageWithCGImage:aImage.CGImage];

    

    NSDictionary  *opts = [NSDictionary dictionaryWithObject:CIDetectorAccuracyHigh

                                                      forKey:CIDetectorAccuracy];

    

    CIDetector* detector = [CIDetector detectorOfType:CIDetectorTypeFace

                                              context:nil

                                              options:opts];

    

    //得到面部数据

    NSArray* features = [detector featuresInImage:image];

    for (CIFaceFeature *f in features)

    {

        

        CGRect aRect = f.bounds;

        aRect.origin.y = imageView.bounds.size.height - aRect.size.height - aRect.origin.y;//self.bounds.size

        UIView *vv = [[UIView alloc]initWithFrame:CGRectMake(aRect.origin.x, aRect.origin.y, aRect.size.width, aRect.size.height)];

        [vv setTransform:CGAffineTransformMakeScale(1, -1)];

        vv.backgroundColor = [UIColor redColor];

        vv.alpha = 0.6;

        [imageView addSubview:vv];

    }

    

}