人脸识别（简单代码）

//

// ViewController.m

// 人脸识别

//

// Created by yangxiuying on 15/2/15.

// Copyright (c) 2015年 lanjiying. All rights reserved.

//

#import "ViewController.h"

#define SCREENWIDTH [UIScreen mainScreen].bounds.size.width

#define SCREENHEIGHT [UIScreen mainScreen].bounds.size.height

@interface
ViewController ()
{

//原来的图像

UIImageView * _originleImagView;

//识别出来的图像

UIImageView * newfaceImageView;


}

@property(nonatomic,assign)NSInteger featureCount;

@end

@implementation ViewController

- (void)viewDidLoad {

[super
viewDidLoad];

// Do any additional setup after loading the view, typically from a nib.

_featureCount =
0;

UIImage * oldFaceImg = [UIImage
imageNamed:@"faces1"];

_originleImagView = [[UIImageView
alloc] initWithFrame:CGRectMake(0,
20, oldFaceImg.size.width, oldFaceImg.size.height)];
[_originleImagView
setImage:oldFaceImg];

_originleImagView.center =
CGPointMake(SCREENWIDTH/2, oldFaceImg.size
.height/2+30);



[self.view
addSubview:_originleImagView];



UIButton * featureButton = [UIButton
buttonWithType:UIButtonTypeCustom];
featureButton.frame =
CGRectMake(0,
0, 120,
50);
featureButton.center =
CGPointMake(SCREENWIDTH/2, oldFaceImg.size.height +
30 + 30);

[featureButton setTitle:[NSString
stringWithFormat:@"识别人脸%ld次",(long)_featureCount]
forState:UIControlStateNormal];

[featureButton setTitle:@"识别的图像为"
forState:UIControlStateSelected];
featureButton.backgroundColor = [UIColor
grayColor];

[featureButton setTitleColor:[UIColor
whiteColor] forState:UIControlStateNormal];

[featureButton setTitleColor:[UIColor
whiteColor] forState:UIControlStateSelected];

[featureButton addTarget:self
action:@selector(faceFetureButtonAction:)
forControlEvents:UIControlEventTouchUpInside];
[self.view
addSubview:featureButton];



newfaceImageView = [[UIImageView
alloc] initWithFrame:CGRectMake(SCREENWIDTH/2, oldFaceImg.size.height
+ 30+ 60 ,
50, 50)];

[self.view
addSubview:newfaceImageView];


}
-(void)faceFetureButtonAction:(UIButton *)button
{

//核心代码进行人脸识别

CIContext * context = [CIContext
contextWithOptions:nil];

UIImage * imageInput = [_originleImagView
image];

CIImage * imageChange = [CIImage
imageWithCGImage:imageInput.CGImage];

//
设置识别的参数

NSDictionary * param = [NSDictionary
dictionaryWithObject:CIDetectorAccuracyHigh
forKey:CIDetectorAccuracy];

//声明CIDetector

CIDetector * faceDetector = [CIDetector
detectorOfType:CIDetectorTypeFace
context:context options:param];

//取得识别结果

NSArray * detectResult = [faceDetector
featuresInImage:imageChange];

UIView * resultView = [[UIView
alloc] initWithFrame:_originleImagView.frame];
[self.view
addSubview:resultView];

for (CIFaceFeature * faceFeature
in detectResult) {

//脸部

UIView * faceView = [[UIView
alloc] initWithFrame:faceFeature.bounds];
faceView.layer.borderWidth =
1;

faceView.layer.borderColor = [UIColor
orangeColor].CGColor;
[resultView
addSubview:faceView];



//左眼

if (faceFeature.hasLeftEyePosition) {

UIView * leftEyeView = [[UIView
alloc] initWithFrame:CGRectMake(0,
0, 5,
5)];
[leftEyeView
setCenter:faceFeature.leftEyePosition];
leftEyeView.layer.borderWidth =
1;
leftEyeView.layer.borderColor = [UIColor
orangeColor].CGColor;
[resultView
addSubview:leftEyeView];
}



//右眼

if (faceFeature.hasRightEyePosition) {

UIView * rightEyeView = [[UIView
alloc] initWithFrame:CGRectMake(0,
0, 5,
5)];
[rightEyeView
setCenter:faceFeature.rightEyePosition];
rightEyeView.layer.borderColor = [UIColor
orangeColor].CGColor;
rightEyeView.layer.borderWidth =
1;
[resultView
addSubview:rightEyeView];
}



//嘴巴

if (faceFeature.hasMouthPosition) {

UIView * mouthView = [[UIView
alloc] initWithFrame:CGRectMake(0,
0, 10,
5)];
[mouthView
setCenter:faceFeature.rightEyePosition];
mouthView.layer.borderColor = [UIColor
orangeColor].CGColor;
mouthView.layer.borderWidth =
1;
[resultView
addSubview:mouthView];
}

[resultView setTransform:CGAffineTransformMakeScale(1, -1)];

if ([detectResult
count] > 0) {
{

CIImage * faceImage = [imageChange
imageByCroppingToRect:[[detectResult objectAtIndex:0]
bounds]];

UIImage * face = [UIImage
imageWithCGImage:[context
createCGImage:faceImage fromRect:faceImage.extent]];

newfaceImageView.image = face;

newfaceImageView.frame =
CGRectMake(SCREENWIDTH/2-40,
300+ 30+
60 ,80 , 80);

_featureCount +=1;

[button setTitle:[NSString
stringWithFormat:@"识别次数%ld次",(long)_featureCount]
forState:UIControlStateNormal];


}
}
}
}
运行效果如下：