我正在尝试实现内置的iOS5人脸检测API。我正在使用UIImagePickerController的实例来允许用户拍照，然后我尝试使用CIDetector来检测面部特征。不幸的是，featuresInImage总是返回一个大小为0的数组。代码如下:-(void)imagePickerController:(UIImagePickerController*)pickerdidFinishPickingMediaWithInfo:(NSDictionary*)info{UIImage*picture=[infoobjectForKey:UIImagePickerControllerOri

我收到一个ImageView-(void)imagePickerController:(UIImagePickerController*)pickerdidFinishPickingMediaWithInfo:(NSDictionary*)info{NSString*mediaType=info[UIImagePickerControllerMediaType];[selfdismissViewControllerAnimated:YEScompletion:nil];if([mediaTypeisEqualToString:(NSString*)kUTTypeImage]){UIIm