iOS中基于CIDetector的人脸识别

title: iOS中基于CIDetector的人脸识别
type: categories
date: 2016-11-28 14:10:07
categories: OC

tags: [CIDetector, 人脸识别]

CIDetector是iOS中自带的人脸识别框架，使用起来相对方便。

效果图

本文Demo

https://github.com/zhangzhaopds/CIDetector_demo.git

具体实现

// 人脸识别- (void)detectorFace {    // 上下文    CIContext *content = [CIContext contextWithOptions:nil];    /**     1、识别精度 Detector Accuracy        key: CIDetectorAccuracy        value: CIDetectorAccuracyLow    低精度识别速度快               CIDetectorAccuracyHigh   高精度识别速度慢     */    /**     2、识别类型 Detector Types        CIDetectorTypeFace      面部识别        CIDetectorTypeRectangle 矩形识别        CIDetectorTypeQRCode    条码识别        CIDetectorTypeText      文本识别     */    /**     3、 具体特征 Feature Detection        CIDetectorImageOrientation  图片方向        CIDetectorEyeBlink          识别眨眼（closed eyes）        CIDetectorSmile             笑脸        CIDetectorFocalLength       焦距        CIDetectorAspectRatio       矩形宽高比        CIDetectorReturnSubFeatures 是否检测子特征     */    // 配置识别质量    NSDictionary *param = [NSDictionary dictionaryWithObject:CIDetectorAccuracyHigh forKey:CIDetectorAccuracy];    // 创建人脸识别器    CIDetector *detector = [CIDetector detectorOfType:CIDetectorTypeFace context:content options:param];    // 识别图片    CIImage *ciImg = [CIImage imageWithCGImage:_myImageView.image.CGImage];    // 识别特征: 这里添加了眨眼和微笑    // CIDetectorSmile 眼部的识别效果很差，很难识别出来    NSDictionary *featuresParam = @{CIDetectorSmile: [NSNumber numberWithBool:true],                                    CIDetectorEyeBlink: [NSNumber numberWithBool:true]};    // 获取识别结果    NSArray *resultArr = [detector featuresInImage:ciImg options:featuresParam];    UIView *resultView = [[UIView alloc] initWithFrame:_myImageView.frame];    [self.view addSubview:resultView];    for (CIFaceFeature *feature in resultArr) {        NSLog(@"微笑：%d", feature.hasSmile);        NSLog(@"右眼：%d", feature.rightEyeClosed);        NSLog(@"左眼：%d", feature.leftEyeClosed);        NSLog(@"脸框：%d", feature.hasFaceAngle);        NSLog(@"嘴：%d", feature.hasMouthPosition);        /**          关于feature中的position需要注意的是:            position是以所要识别图像的原始尺寸为标准；            因此，            如果装载图片的UIImageView的尺寸与图片原始尺寸不一样的话，会出现识别的位置有偏差。         */        UIView *faceView = [[UIView alloc] initWithFrame:feature.bounds];        faceView.layer.borderColor = [UIColor redColor].CGColor;        faceView.layer.borderWidth = 1;        [resultView addSubview:faceView];        // 坐标系的转换        [resultView setTransform:CGAffineTransformMakeScale(1, -1)];        // 左眼        if (feature.hasLeftEyePosition) {            UIView * leftEyeView = [[UIView alloc] initWithFrame:CGRectMake(0, 30, 20, 20)];            [leftEyeView setCenter:feature.leftEyePosition];            leftEyeView.layer.borderWidth = 1;            leftEyeView.layer.borderColor = [UIColor greenColor].CGColor;            [resultView addSubview:leftEyeView];        }        // 右眼        if (feature.hasRightEyePosition) {            UIView * rightEyeView = [[UIView alloc] initWithFrame:CGRectMake(0, 0, 20, 20)];            [rightEyeView setCenter:feature.rightEyePosition];            rightEyeView.layer.borderWidth = 1;            rightEyeView.layer.borderColor = [UIColor redColor].CGColor;            [resultView addSubview:rightEyeView];        }        // 嘴部        if (feature.hasMouthPosition) {            UIView * mouthView = [[UIView alloc] initWithFrame:CGRectMake(0, 0, 30, 30)];            [mouthView setCenter:feature.mouthPosition];            mouthView.layer.borderWidth = 1;            mouthView.layer.borderColor = [UIColor redColor].CGColor;            [resultView addSubview:mouthView];        }    }}