The Telos ONYX SDK enables mobile applications to capture and process fingerprints using a smartphone's rear camera, leveraging neural networks for image capture and processing. It features technologies like Depth-from-Focus and Pyramid Scaling for image calibration and scaling, along with anti-spoofing capabilities through ONYXlive. The SDK supports integration with iOS, Android, and HTML5 platforms, performs on-device matching, and compresses images using WSQ. It also provides various image formats and adjusts for scale variations to ensure compatibility with existing systems.