iOS 人脸识别拾遗一 坐标转换 截取

// 得到图片的尺寸
CIImage *faceImage = [CIImage imageWithCGImage:image.CGImage];
CGSize inputImageSize = [faceImage extent].size;
//将image沿y轴对称 这个不能少 少了取到的image为空
CGAffineTransform transform = CGAffineTransformScale(CGAffineTransformIdentity, 1, -1);
//将图片上移
transform = CGAffineTransformTranslate(transform, 0, -inputImageSize.height);
//取第一张脸去截取
CIFaceFeature *faceFeature = [features firstObject];
//获取人脸的frame
CGRect faceViewBounds = CGRectApplyAffineTransform(faceFeature.bounds, transform);
UIImage *smallImage = [VideoCaptureView ct_imageFromImage:image inRect:faceViewBounds];

附 裁剪image

+ (UIImage *)imageFromImage:(UIImage *)image inRect:(CGRect)rect{
//截取部分图片并生成新图片
CGImageRef sourceImageRef = [image CGImage];
CGImageRef newImageRef = CGImageCreateWithImageInRect(sourceImageRef, rect);
UIImage *newImage = [UIImage imageWithCGImage:newImageRef scale:1 orientation:image.imageOrientation];
return newImage;
}

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