我需要一个使用OpenCV来比较2个面（UIimage）并与IOS保持距离的示例

I working on an ios (objective-c) project and I need to compare between 2 faces (each one is an UIimage)with opencv and to get the distance, I know 2 ways that can do it Eigenfaces and Fisherfaces, but I can't find a good example in ios Are there any recommendations for good code examples that show how to use Eigenfaces or Fisherfaces in ios?I working on an ios (objective-c) project and I