iOS 简单的人脸识别，获取人脸位置_ios开发-识别图片中的五官

//人脸位置检测，并裁剪包含五官的人脸
- (UIImage *)detectFace{
    UIImage *resultImage;
    if (self.displayImageView.image) {
        CIImage *cgImage = [[CIImage alloc] initWithImage:self.displayImageView.image];
        CIContext *context = [CIContext contextWithOptions:nil];
        CIDetector *faceDetector = [CIDetector detectorOfType:CIDetectorTypeFace context:context options:@{CIDetectorAccuracy:CIDetectorAccuracyHigh}];
        //检测到的人脸数组
        NSArray *faceArray = [faceDetector featuresInImage:cgImage];
        if (faceArray.count > 0) {
            //检测到人脸时获取最后一次监测到的人脸
            CIFeature *faceFeature = [faceArray lastObject];
            CGRect faceBounds = faceFeature.bounds;
            //cgImage计算的尺寸是像素，需要与空间的尺寸做个计算
            //下面几句是为了获取到额头部位做的处理，如果只需要定位到五官可直接取faceBounds的值
            CGFloat scale = cgImage.extent.size.width/ScreenWidth;
            CGFloat offsetY = fabs(