face++人脸识别

简介：        Face++是北京旷视科技有限公司旗下的人脸识别云服务平台，Face++平台通过提供云端API、离线SDK、以及面向用户的自主研发产品等形式，将人脸识别技术广泛应用到互联网及移动应用场景中。Face++为广大开发者提供了简单易用的API，开发者可以轻松搭建属于自己的云端身份认证、用户兴趣挖掘、移动体感交互、社交娱乐分享等多种类型的应用。

        Face++提供的技术服务包括人脸检测、人脸分析和人脸识别，主要说明如下：

                1）人脸检测：可以从图片中快速、准确的定位面部的关键区域位置，包括眉毛、眼睛、鼻子、嘴巴等。
                2）人脸分析：可以从图片或实时视频流中分析出人脸的性别（准确度达96%）、年龄、种族等多种属性。

                3）人脸识别：可以快速判定两张照片是否为同一个人，或者快速判定视频中的人像是否为某一位特定的人。

  现面是一个简单的人脸识别demo：

人脸显示区：

    _pickerImage = [[UIImagePickerController alloc] init];//初始化    UIView * aview = [[UIView alloc] initWithFrame:CGRectMake(0, 120, self.view.bounds.size.width, self.view.bounds.size.height-120)];    [self.view addSubview:aview];

人脸轮廓分析：

- (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;}

获取面部轮廓：

-(void) detectWithImage: (UIImage*) image {        //    NSAutoreleasePool *pool = [[NSAutoreleasePool alloc] init];        /*     *    mode : 检测模式可以是normal(默认) 或者 oneface 。在oneface模式中，检测器仅找出图片中最大的一张脸。     *     *    attribute:可以是none或者由逗号分割的属性列表。默认为gender, age, race, smiling。目前支持的属性包括：gender, age, race, smiling, glass, pose     */        //脸部姿势分析结果中包括 ：pitch_angle, roll_angle, yaw_angle，分别对应抬头，旋转（平面旋转），摇头。单位为角度。     FaceppResult *result = [[FaceppAPI detection] detectWithURL:nil orImageData:UIImageJPEGRepresentation(image, 1) mode:FaceppDetectionModeOneFace attribute:FaceppDetectionAttributeAll];    if (result.success) {        double image_width = [[result content][@"img_width"] doubleValue] *0.01f;        double image_height = [[result content][@"img_height"] doubleValue] * 0.01f;                UIGraphicsBeginImageContext(image.size);        [image drawAtPoint:CGPointZero];        CGContextRef context = UIGraphicsGetCurrentContext();        CGContextSetRGBFillColor(context, 0, 0, 1.0, 1.0);        CGContextSetLineWidth(context, image_width * 0.7f);                // draw rectangle in the image        int face_count = [[result content][@"face"] count];        for (int i=0; i<face_count; i++) {            double width = [[result content][@"face"][i][@"position"][@"width"] doubleValue];            double height = [[result content][@"face"][i][@"position"][@"height"] doubleValue];            CGRect rect = CGRectMake(([[result content][@"face"][i][@"position"][@"center"][@"x"] doubleValue] - width/2) * image_width,                                     ([[result content][@"face"][i][@"position"][@"center"][@"y"] doubleValue] - height/2) * image_height,                                     width * image_width,                                     height * image_height);            CGContextStrokeRect(context, rect);        }                UIImage *newImage = UIGraphicsGetImageFromCurrentImageContext();        UIGraphicsEndImageContext();        float scale = 4.0f;        scale = MIN(scale, 280.0f/newImage.size.width);        scale = MIN(scale, 257.0f/newImage.size.height);        /*         *    图片等比例 自适应         *///        [_imageView setFrame:CGRectMake(_imageView.frame.origin.x,//                                        _imageView.frame.origin.y,//                                        newImage.size.width * scale,//                                        newImage.size.height * scale)];        [_imageView setImage:newImage];                //面部属性分析        NSDictionary * dic = [NSDictionary dictionaryWithDictionary:[result content]];        [self face:dic];            } else {        // some errors occurred        UIAlertView *alert = [[UIAlertView alloc]                              initWithTitle:[NSString stringWithFormat:@"error message: %@", [result error].message]                              message:@""                              delegate:nil                              cancelButtonTitle:@"OK!"                              otherButtonTitles:nil];        [alert performSelectorOnMainThread:@selector(show) withObject:nil waitUntilDone:YES];    }    }

调用相机：

- (IBAction)camera:(id)sender {        if ([UIImagePickerController isSourceTypeAvailable:UIImagePickerControllerSourceTypeCamera]) {        _pickerImage.delegate = self;        _pickerImage.sourceType = UIImagePickerControllerSourceTypeCamera;        [self presentViewController:_pickerImage animated:YES completion:nil];    } else {        UIAlertView *alert = [[UIAlertView alloc]                              initWithTitle:@"没有相机"                              message:@""                              delegate:nil                              cancelButtonTitle:@"OK!"                              otherButtonTitles:nil];        [alert performSelectorOnMainThread:@selector(show) withObject:nil waitUntilDone:YES];    }        }

调用相册：

- (IBAction)photot:(id)sender {        if([UIImagePickerController isSourceTypeAvailable:UIImagePickerControllerSourceTypePhotoLibrary]) {        _pickerImage.sourceType = UIImagePickerControllerSourceTypePhotoLibrary;                _pickerImage.mediaTypes = [UIImagePickerController availableMediaTypesForSourceType:_pickerImage.sourceType];    }    _pickerImage.delegate = self;    _pickerImage.allowsEditing = NO;    [self presentViewController:_pickerImage animated:YES completion:nil];    }

点击相册中的图片 或者照相机照完后点击use  后触发的方法：

- (void)imagePickerController:(UIImagePickerController *)picker didFinishPickingMediaWithInfo:(NSDictionary *)info{    [HUD1 show:YES];    [self.age setText:@"年龄："];    [self.sex setText:@"性别："];    [self.fuse setText:@"肤色："];    [self.weixiao setText:@"微笑程度："];    self.glass.text = nil;        UIImage *sourceImage = info[UIImagePickerControllerOriginalImage];    UIImage *imageToDisplay = [self fixOrientation:sourceImage];#warning new//    [self performSelectorInBackground:@selector(detectWithImage:) withObject:[imageToDisplay retain]];    [self performSelectorInBackground:@selector(detectWithImage:) withObject:imageToDisplay ];    [_imageView setImage:sourceImage];    [picker dismissViewControllerAnimated:YES completion:nil];        }

点击cancel 调用的方法：

- (void)imagePickerControllerDidCancel:(UIImagePickerController *)picker{
    
    [self.age setText:@"年龄："];
    [self.sex setText:@"性别："];
    [self.fuse setText:@"肤色："];
    [self.weixiao setText:@"微笑程度："];
    self.glass.text = nil;
    [picker dismissViewControllerAnimated:YES completion:nil];
    
}

-(void)face:(NSDictionary *)dic{        NSArray * arr = [dic objectForKey:@"face"];        NSDictionary * dic1 = [arr objectAtIndex:0];    NSDictionary * dic2 = [dic1 objectForKey:@"attribute"];        //年龄    NSDictionary * dic3 = [dic2 objectForKey:@"age"];    NSString * ageValue = [dic3 objectForKey:@"value"];    NSString * ageRange = [dic3 objectForKey:@"range"];        //性别    NSDictionary * dic4 = [dic2 objectForKey:@"gender"];    NSString * sex = [dic4 objectForKey:@"value"];        //肤色    NSDictionary * dic5 = [dic2 objectForKey:@"race"];    NSString * renzhong = [dic5 objectForKey:@"value"];        //微笑    NSDictionary * dic6 = [dic2 objectForKey:@"smiling"];    NSString * weixiao = [dic6 objectForKey:@"value"];        //眼镜    NSDictionary * dic7 = [dic2 objectForKey:@"glass"];    NSString * glass = [dic7 objectForKey:@"value"];            [self.age setText:[NSString stringWithFormat:@"年龄：%@(+-%@)",ageValue,ageRange]];        if ([sex isEqualToString:@"Male"]){        [self.sex setText:@"性别：男"];    }else{        [self.sex setText:@"性别：女"];    }    if ([renzhong isEqualToString:@"Asian"]) {        self.fuse.text = @"肤色：黄种人";    }else if ([renzhong isEqualToString:@"White"]){        self.fuse.text = @"肤色：白种人";    }else{        self.fuse.text = @"肤色：黑种人";    }    [self.weixiao setText:[NSString stringWithFormat:@"微笑程度：%@",weixiao]];        if ([glass isEqualToString:@"Normal"]) {        if ([sex isEqualToString:@"Male"]) {            self.glass.text = @"文艺眼镜男";        }else{            self.glass.text = @"文艺眼镜女";        }            }        }

- (IBAction)shuxing:(id)sender {        FaceppResult * result = [[FaceppAPI detection] detectWithURL:nil orImageData:UIImageJPEGRepresentation(_imageView.image, 1) mode:FaceppDetectionModeNormal attribute:FaceppDetectionAttributeAll tag:nil async:NO];    if ([result success]) {        NSDictionary * dic = [NSDictionary dictionaryWithDictionary:[result content]];                NSArray * arr = [dic objectForKey:@"face"];                NSDictionary * dic1 = [arr objectAtIndex:0];        NSDictionary * dic2 = [dic1 objectForKey:@"attribute"];                //年龄        NSDictionary * dic3 = [dic2 objectForKey:@"age"];        NSString * ageValue = [dic3 objectForKey:@"value"];        NSString * ageRange = [dic3 objectForKey:@"range"];                //性别        NSDictionary * dic4 = [dic2 objectForKey:@"gender"];        NSString * sex = [dic4 objectForKey:@"value"];                //肤色        NSDictionary * dic5 = [dic2 objectForKey:@"race"];        NSString * renzhong = [dic5 objectForKey:@"value"];                //微笑        NSDictionary * dic6 = [dic2 objectForKey:@"smiling"];        NSString * weixiao = [dic6 objectForKey:@"value"];                        [self.age setText:[NSString stringWithFormat:@"年龄：%@(+-%@)",ageValue,ageRange]];                if ([sex isEqualToString:@"Male"]){            [self.sex setText:@"性别：男"];        }else{            [self.sex setText:@"性别：女"];        }                if ([renzhong isEqualToString:@"Asian"]) {            self.fuse.text = @"肤色：黄种人";        }else if ([renzhong isEqualToString:@"White"]){            self.fuse.text = @"肤色：白种人";        }else{            self.fuse.text = @"肤色：黑种人";        }        [self.weixiao setText:[NSString stringWithFormat:@"微笑程度：%@",weixiao]];    }    }