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利用CIDetector来人脸识别详解

luoye 2018年06月23日 手机开发 494 0

利用CIDetector来人脸识别

添加图片:

UIImage* image = [UIImage imageNamed:@"face.jpg"];
UIImageView *testImage = [[UIImageView alloc] initWithImage: image];
[testImage setTransform:CGAffineTransformMakeScale(1, -1)];
[[[UIApplication sharedApplication] delegate].window setTransform:
     CGAffineTransformMakeScale(1, -1)];
 [testImage setFrame:CGRectMake(, , testImage.image.size.width,
                                   testImage.image.size.height)];
[self.view addSubview:testImage];

识别图片:

CIImage* ciimage = [CIImage imageWithCGImage:image.CGImage];
NSDictionary* opts = [NSDictionary dictionaryWithObject:
                          CIDetectorAccuracyHigh forKey:CIDetectorAccuracy];
CIDetector* detector = [CIDetector detectorOfType:CIDetectorTypeFace
                                              context:nil options:opts];
NSArray* features = [detector featuresInImage:ciimage];

标出脸部,眼睛和嘴:

for (CIFaceFeature *faceFeature in features){
}

// 标出脸部

CGFloat faceWidth = faceFeature.bounds.size.width;
UIView* faceView = [[UIView alloc] initWithFrame:faceFeature.bounds];
faceView.layer.borderWidth = 1;
faceView.layer.borderColor = [[UIColor redColor] CGColor];
[self.view addSubview:faceView];

// 标出左眼

if(faceFeature.hasLeftEyePosition) {
      UIView* leftEyeView = [[UIView alloc] initWithFrame:
                                   CGRectMake(faceFeature.leftEyePosition.x-faceWidth*0.15,
                                              faceFeature.leftEyePosition.y-faceWidth*0.15, faceWidth*0.3, faceWidth*0.3)];
     [leftEyeView setBackgroundColor:[[UIColor blueColor] colorWithAlphaComponent:0.3]];
     [leftEyeView setCenter:faceFeature.leftEyePosition];
     leftEyeView.layer.cornerRadius = faceWidth*0.15;
     [self.view  addSubview:leftEyeView];
}

// 标出右眼

if(faceFeature.hasRightEyePosition) {
       UIView* leftEye = [[UIView alloc] initWithFrame:
                               CGRectMake(faceFeature.rightEyePosition.x-faceWidth*0.15,
                                          faceFeature.rightEyePosition.y-faceWidth*0.15, faceWidth*0.3, faceWidth*0.3)];
       [leftEye setBackgroundColor:[[UIColor blueColor] colorWithAlphaComponent:0.3]];
       [leftEye setCenter:faceFeature.rightEyePosition];
       leftEye.layer.cornerRadius = faceWidth*0.15;
       [self.view  addSubview:leftEye];
}

// 标出嘴部

if(faceFeature.hasMouthPosition) {
    UIView* mouth = [[UIView alloc] initWithFrame:
                             CGRectMake(faceFeature.mouthPosition.x-faceWidth*0.2,
                                        faceFeature.mouthPosition.y-faceWidth*0.2, faceWidth*0.4, faceWidth*0.4)];
     [mouth setBackgroundColor:[[UIColor greenColor] colorWithAlphaComponent:0.3]];
      [mouth setCenter:faceFeature.mouthPosition];
      mouth.layer.cornerRadius = faceWidth*0.2;
      [self.view  addSubview:mouth]; 
}

code


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