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]];
}
}