识别出脸部以及给脸部打马赛克

原始图片 & 打马后的图片

说明

1. 通过CIDetector来识别出脸部获取相关数据

2. 将CoreImage坐标转换为UIKit坐标

3. 将脸部区域进行截图

4. 将截图进行打马处理(各位喜闻乐见^_^)

核心源码

https://github.com/YouXianMing/FaceDetection

//
//  UIImageView+FaceDetect.h
//  FaceDetectionExample
//
//  Created by YouXianMing on 15/5/29.
//  Copyright (c) 2015年 JID Marketing. All rights reserved.
//#import <UIKit/UIKit.h>@interface UIImageView (FaceDetect)- (NSArray *)faceRects;@end

//
//  UIImageView+FaceDetect.m
//  FaceDetectionExample
//
//  Created by YouXianMing on 15/5/29.
//  Copyright (c) 2015年 JID Marketing. All rights reserved.
//#import "UIImageView+FaceDetect.h"@implementation UIImageView (FaceDetect)- (NSArray *)faceRects {if (self.image == nil) {return nil;}// 初始化数组NSMutableArray *faceRectsArray = [NSMutableArray array];// 获取CIImageCIImage* image                 = [CIImage imageWithCGImage:self.image.CGImage];// 创建脸部识别器CIDetector* detector           = [CIDetector detectorOfType:CIDetectorTypeFacecontext:niloptions:[NSDictionary dictionaryWithObject:CIDetectorAccuracyHighforKey:CIDetectorAccuracy]];// 获取侦测到的数据NSArray* features              = [detector featuresInImage:image];// CoreImage坐标转换为UIKit坐标CGAffineTransform transform    = CGAffineTransformMakeScale(1, -1);transform                      = CGAffineTransformTranslate(transform, 0, -self.bounds.size.height);// 处理for(CIFaceFeature* faceFeature in features){// 转换坐标系统const CGRect faceRect = CGRectApplyAffineTransform(faceFeature.bounds, transform);// 添加rect[faceRectsArray addObject:[NSValue valueWithCGRect:faceRect]];}return faceRectsArray;
}@end

//
//  ViewController.m
//  CoreImageMask
//
//  Created by YouXianMing on 15/5/29.
//  Copyright (c) 2015年 YouXianMing. All rights reserved.
//#import "ViewController.h"
#import "UIImageView+FaceDetect.h"
#import "CIFilter+Utility.h"
#import "UIImage+Crop.h"@interface ViewController ()@end@implementation ViewController- (void)viewDidLoad {[super viewDidLoad];UIImage *image = [UIImage imageNamed:@"demo.png"];// 加载ImageViewUIImageView *imageView = [[UIImageView alloc] initWithImage:image];imageView.center       = self.view.center;[self.view addSubview:imageView];NSArray *faceRectArray = [imageView faceRects];for (int i = 0; i < faceRectArray.count; i++) {// 获取脸部的rectNSValue *value  = faceRectArray[i];CGRect faceRect = value.CGRectValue;// 截取脸部的图片UIImage *faceImage = [image cropAtRect:faceRect];// 添加脸部的图片UIImageView *faceImageView = [[UIImageView alloc] initWithImage:[self CIPixellateImage:faceImage]];faceImageView.frame        = faceRect;[imageView addSubview:faceImageView];}
}- (UIImage *)CIPixellateImage:(UIImage *)image {CIImage *ciImage  = [[CIImage alloc] initWithImage:image];CIFilter *filter  = [CIFilter filterWithName:@"CIPixellate"];filter.inputImage = ciImage;filter.inputScale = @(5.f);return [filter outputUIImage];
}@end