Question: I'm looking for a face detection SDK that can identify facial features and emotions for a biometric authentication system.

If you need a face detection SDK that can detect facial features and emotions for a biometric authentication system, Luxand is a good choice. Its SDKs and APIs can perform face recognition in still images and video streams, recognize faces in live video with self-learning AI, recognize faces in IP cameras and detect faces in thermal imagery. The suite also includes specific features like mask-on face detection and liveness detection that are useful for security and biometric user authentication.

Another interesting project is Luxand, a cloud-based facial recognition API that offers face recognition, age and gender detection, emotion detection and facial landmark detection. The service is designed to handle large volumes of photos and can be called through various programming languages. With different pricing levels to match different needs, it's a good option for biometric authentication, attendance and fraud detection.

Facia offers a higher-end facial recognition technology that includes face recognition, liveness detection, face matching and iris recognition. It's designed to thwart fraud and spoofing attacks and can be used with on-premise data storage. The service spans a range of use cases, including access control and government surveillance, so it's a good option for a variety of businesses.

Jumio is another mature option, offering an AI-powered identity verification platform that includes ID checks, selfie comparisons and liveness detection. It offers predictive fraud insights and real-time risk assessment, which is useful for financial services, healthcare and government. With detailed risk scoring and integration through APIs, SDKs and web apps, Jumio promises strong security and compliance.