iOS人脸识别

// ViewController.m

// 02-人脸识别

// Created by Romeo on 15/9/25.

#import "ViewController.h"

#import "FaceppAPI.h"

#import "UIView+AutoLayout.h"

@interface ViewController ()<UINavigationControllerDelegate, UIImagePickerControllerDelegate>

@property (weak, nonatomic) IBOutlet UIImageView *imageVIew;

@end

@implementation ViewController

- (void)viewDidLoad {

[super viewDidLoad];

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

}

/**

UIImagePickerControllerSourceTypePhotoLibrary, 照片库

UIImagePickerControllerSourceTypeCamera, 相机

UIImagePickerControllerSourceTypeSavedPhotosAlbum 相册

#pragma mark 相册

- (IBAction)selectPhotoClick:(id)sender {

//1. 首先判断是否可用

if (![UIImagePickerController isSourceTypeAvailable:UIImagePickerControllerSourceTypePhotoLibrary]) {

return;

}

//2. 创建选择控制器

UIImagePickerController *picker = [UIImagePickerController new];

//3. 设置类型

picker.sourceType = UIImagePickerControllerSourceTypePhotoLibrary;

//4. 设置代理

picker.delegate = self;

//5. 弹出

[self presentViewController:picker animated:YES completion:nil];

}

#pragma mark 相机

- (IBAction)selectCameClick:(id)sender {

//1. 首先判断是否可用

if (![UIImagePickerController isSourceTypeAvailable:UIImagePickerControllerSourceTypeCamera]) {

return;

}

//2. 创建选择控制器

UIImagePickerController *picker = [UIImagePickerController new];

//3. 设置类型

picker.sourceType = UIImagePickerControllerSourceTypeCamera;

//4. 设置代理

picker.delegate = self;

//5. 弹出

[self presentViewController:picker animated:YES completion:nil];

}

#pragma mark Picker代理方法

//点击照片的时候调用

- (void)imagePickerController:(UIImagePickerController *)picker didFinishPickingMediaWithInfo:(NSDictionary<NSString *,id> *)info

{

//1. 获取选择的图像

UIImage *image = info[UIImagePickerControllerOriginalImage];

//orientation 0 --> 在做人脸识别, 一定要方向为0

//2. 校正方向

image = [self fixOrientation:image];

//3. 开始检测

NSData *data = UIImageJPEGRepresentation(image, 0.5);

// UIImagePNGRepresentation(<#UIImage * _Nonnull image#>)

//detection/detect 检测一张照片中的人脸信息（脸部位置、年龄、种族、性别等等）

FaceppResult *result = [[FaceppAPI detection] detectWithURL:nil orImageData:data];

//4. 获取性别,年龄

NSDictionary *attributeDict = result.content[@"face"][0][@"attribute"];

NSString *ageValue = attributeDict[@"age"][@"value"];

NSString *sexValue = [attributeDict[@"gender"][@"value"] isEqualToString:@"Male"] ? @"男性" : @"女性";

//5. 获取脸部位置 (比例值)

NSDictionary *positionDict = result.content[@"face"][0][@"position"];

CGFloat h = [positionDict[@"height"] floatValue];

CGFloat w = [positionDict[@"width"] floatValue];

CGFloat x = [positionDict[@"center"][@"x"] floatValue] - w * 0.5;

CGFloat y = [positionDict[@"center"][@"y"] floatValue] - h * 0.5;

//6. 画图--> 画脸到 image 上

//6.1 开启图像图形上下文

UIGraphicsBeginImageContextWithOptions( image.size, NO, 0);

//6.2 将原图先绘制到底部, 从(0, 0)点开始绘制

[image drawAtPoint:CGPointZero];

//6.3 画素材图像到图形上下文中

UIImage *aImage = [UIImage imageNamed:@"cang"];

// 根据原图的大小比例来计算自己的位置

CGFloat imageW = image.size.width;

CGFloat imageH = image.size.height;

[aImage drawInRect:CGRectMake(x * 0.01 * imageW , y * 0.01 * imageH, w * 0.01 * imageW, h * 0.01 * imageH)];

// 320 50% 160

//50 * 0.01 * 320 = 160

//6.4 合成新的图像

UIImage *newImage = UIGraphicsGetImageFromCurrentImageContext();

//6.5 关闭图像上下文

UIGraphicsEndImageContext();

//7. 在控制器显示

//删除原有约束,然后重新添加

// 删除原有约束

[self.imageVIew autoRemoveConstraintsAffectingView];

// 设置居中

[self.imageVIew autoCenterInSuperview];

// 设置宽高 --> 需要根据图片的比例来确定

//960 * 1080

// 假如我们需要宽度: 屏幕总宽度

// iPhone5 : 320

// iPhone6 : 375

CGFloat scale = newImage.size.width / [UIScreen mainScreen].bounds.size.width;

//Dimension : 尺寸 --> 宽高

[self.imageVIew autoSetDimension: ALDimensionWidth toSize:newImage.size.width / scale];

[self.imageVIew autoSetDimension:ALDimensionHeight toSize:newImage.size.height / scale];

self.imageVIew.image = newImage;

//8. 实现了代理方法一定要取消

[picker dismissViewControllerAnimated:YES completion:nil];

}

#pragma mark 方向校正

/**

1. 先将头部朝上

2. 将镜像反转

3. 重新合成输出

- (UIImage*)fixOrientation:(UIImage*)aImage

{

// No-op if the orientation is already correct

if (aImage.imageOrientation == UIImageOrientationUp)

return aImage;

// We need to calculate the proper transformation to make the image upright.

// We do it in 2 steps: Rotate if Left/Right/Down, and then flip if Mirrored.

CGAffineTransform transform = CGAffineTransformIdentity;

switch (aImage.imageOrientation) {

case UIImageOrientationDown:

case UIImageOrientationDownMirrored:

transform = CGAffineTransformTranslate(transform, aImage.size.width, aImage.size.height);

transform = CGAffineTransformRotate(transform, M_PI);

break;

case UIImageOrientationLeft:

case UIImageOrientationLeftMirrored:

transform = CGAffineTransformTranslate(transform, aImage.size.width, 0);

transform = CGAffineTransformRotate(transform, M_PI_2);

break;

case UIImageOrientationRight:

case UIImageOrientationRightMirrored:

transform = CGAffineTransformTranslate(transform, 0, aImage.size.height);

transform = CGAffineTransformRotate(transform, -M_PI_2);

break;

default:

break;

}

switch (aImage.imageOrientation) {

case UIImageOrientationUpMirrored:

case UIImageOrientationDownMirrored:

transform = CGAffineTransformTranslate(transform, aImage.size.width, 0);

transform = CGAffineTransformScale(transform, -1, 1);

break;

case UIImageOrientationLeftMirrored:

case UIImageOrientationRightMirrored:

transform = CGAffineTransformTranslate(transform, aImage.size.height, 0);

transform = CGAffineTransformScale(transform, -1, 1);

break;

default:

break;

}

// Now we draw the underlying CGImage into a new context, applying the transform

// calculated above.

CGContextRef ctx = CGBitmapContextCreate(NULL, aImage.size.width, aImage.size.height,

CGImageGetBitsPerComponent(aImage.CGImage), 0,

CGImageGetColorSpace(aImage.CGImage),

CGImageGetBitmapInfo(aImage.CGImage));

CGContextConcatCTM(ctx, transform);

switch (aImage.imageOrientation) {

case UIImageOrientationLeft:

case UIImageOrientationLeftMirrored:

case UIImageOrientationRight:

case UIImageOrientationRightMirrored:

CGContextDrawImage(ctx, CGRectMake(0, 0, aImage.size.height, aImage.size.width), aImage.CGImage);

break;

default:

CGContextDrawImage(ctx, CGRectMake(0, 0, aImage.size.width, aImage.size.height), aImage.CGImage);

break;

}

// And now we just create a new UIImage from the drawing context

CGImageRef cgimg = CGBitmapContextCreateImage(ctx);

UIImage* img = [UIImage imageWithCGImage:cgimg];

CGContextRelease(ctx);

CGImageRelease(cgimg);

return img;

}

@end