A basic image processing and computer vision library is OpenCV. This is the first thing to look into, but sincerely - don't expect to have all what you need already implemented there.
There are some facial recognition API providers. Face++ is the only one who supply all free online APIs and SDKs. It can do facial detection with up to 83 key points, and give the race, age, gender, smiling messages and so on. Maybe you can try its local iOS facial detector for your iPhone Apps.
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基本的图像处理和计算机视觉库是 OpenCV。这是首先要研究的事情，但真诚地 - 不要指望在那里已经实现了您需要的所有内容。
A basic image processing and computer vision library is OpenCV. This is the first thing to look into, but sincerely - don't expect to have all what you need already implemented there.
有一些面部识别 API 提供商。 Face++是唯一一家提供所有免费在线API和SDK的公司。它可以进行多达83个关键点的面部检测，并给出种族、年龄、性别、微笑信息等。也许您可以尝试将其本地 iOS 面部检测器用于您的 iPhone 应用程序。
这是网页：www.faceplusplus.com
There are some facial recognition API providers. Face++ is the only one who supply all free online APIs and SDKs. It can do facial detection with up to 83 key points, and give the race, age, gender, smiling messages and so on. Maybe you can try its local iOS facial detector for your iPhone Apps.
Here's the webpage: www.faceplusplus.com