iOS 人脸识别功能

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使用 coreimage 可以实现人脸识别功能，并且获取到人脸面部五官的位置。

CIContext *context = [[CIContextalloc]init];

CIImage *ciImage = [CIImageimageWithCGImage:_faceImg.CGImage];

NSDictionary *dic = [NSDictionarydictionaryWithObject:CIDetectorAccuracyforKey:CIDetectorAccuracyHigh];

CIDetector *detector = [CIDetectordetectorOfType:CIDetectorTypeFacecontext:niloptions:dic];

NSArray *array = [detector featuresInImage:ciImage];

// 照片中只有一个人脸的人脸识别

if (array.count ==1) {

for (CIFaceFeature *featurein array) {

NSInteger leftEye_X = feature.leftEyePosition.x;

NSInteger leftEye_Y = feature.leftEyePosition.y;

NSInteger rightEye_X = feature.rightEyePosition.x;

NSInteger rightEye_Y = feature.rightEyePosition.y;

// NSInteger mouth_X = feature.mouthPosition.x;

NSInteger mouth_Y = feature.mouthPosition.y;

// 头为正左眼高右眼底需逆时针旋转

if (leftEye_Y > rightEye_Y && leftEye_Y > mouth_Y && leftEye_X < rightEye_X)

{

CGFloat height = leftEye_Y - rightEye_Y;

CGFloat width = rightEye_X - leftEye_X;

CGFloat rad = atan(height/width);

self.transform =CGAffineTransformMakeRotation(-rad);

}else if (leftEye_Y < rightEye_Y && rightEye_Y > mouth_Y && leftEye_X < rightEye_X)

{

CGFloat height = rightEye_Y - leftEye_Y;

CGFloat width = rightEye_X - leftEye_X;

CGFloat rad = atan(height/width);

self.transform =CGAffineTransformMakeRotation(rad);

}else if (leftEye_X >= rightEye_X && leftEye_Y >= rightEye_Y && mouth_Y > leftEye_Y) {

CGFloat height = leftEye_Y - rightEye_Y;

CGFloat width = leftEye_X - rightEye_X;

CGFloat rad = atan(height/width);

self.transform =CGAffineTransformMakeRotation(-(M_PI-rad));

}else if (leftEye_X >= rightEye_X && rightEye_Y >= leftEye_Y && mouth_Y > leftEye_Y) {

CGFloat height = rightEye_Y - leftEye_Y;

CGFloat width = leftEye_X - rightEye_X;

CGFloat rad = atan(height/width);

self.transform =CGAffineTransformMakeRotation((M_PI - rad));

}else{

self.transform =CGAffineTransformMakeRotation(0);

}

// 照片中有多个人脸的人脸识别给每个人脸打上马赛克

}else if (array.count >1){

CGSize inputImageSize = ciImage.extent.size;

CGAffineTransform transform =CGAffineTransformIdentity;

transform = CGAffineTransformScale(transform,1, -1);

transform = CGAffineTransformTranslate(transform,0, -inputImageSize.height);

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