iOS简单的人脸识别

IOS5以上支持，很简单就能做出人脸识别

//放上一张照片

_imageView = [[UIImageView alloc] initWithFrame:CGRectMake(0, 0, 320, 480)];

_imageView.image = [UIImage imageNamed:@"10_7.jpg"];

[self.view addSubview:_imageView];

//一张空白的view，和照片一样大，添加到照片上面

_resultView = [[UIView alloc] initWithFrame:CGRectMake(0, 0, 320, 480)];

[self.view addSubview:_resultView];

//人脸识别出得到的坐标是标准坐标系，我们要把标准的倒过来，和ios的坐标系一致

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

//创建CIDetector，这个类是用来识别的

NSDictionary* dic = @{CIDetectorAccuracy:CIDetectorAccuracyHigh};

CIDetector* detector = [CIDetector detectorOfType:CIDetectorTypeFace context:[CIContext contextWithOptions:nil] options:dic];

//识别一张图片CIIamge，并得到结果，可能有多个人，所以是数组

NSArray* resultArray = [detector featuresInImage:[CIImage imageWithCGImage:_imageView.image.CGImage]];

//便利数组，每一个人脸识别都是一个CIFaceFeature

for (CIFaceFeature* feature in resultArray) {

//人脸的区域

CGRect rect = feature.bounds;

UIView* view = [[UIView alloc] initWithFrame:rect];

view.backgroundColor = [UIColor redColor];

view.alpha = 0.3;

[_resultView addSubview:view];

//如果识别出左眼，我们也给显示出来，右眼也一样

if (feature.hasLeftEyePosition) {

UIView* eyeView = [[UIView alloc] initWithFrame:CGRectMake(0, 0, 5, 5)];

eyeView.backgroundColor = [UIColor blueColor];

eyeView.center = feature.leftEyePosition;

[_resultView addSubview:eyeView];

}

}