Function Metadata Metadata uses individual instances of application data or the data content. Metadata can be used for third-party application development. Face Capture With embedded deep learning based algorithms, the camera is able to give the best shot of a target face through detecting, tracking, capturing, grading and selecting. The procedure reduces the happening of mistaken capture, and thus gets the best face shot, improving the accuracy rate of face comparison by the back-end devices. The camera uses face exposure function to dynamically adjusts face area exposure of captures and ensure high face picture quality. Face Recognition With embedded deep learning based algorithms, the camera is capable of comparing captured faces with faces in libraries instantly and returning results. The camera uses face exposure function to dynamically adjusts face area exposure of captures and ensure high face picture quality.