Abstract: The present disclosure relates to a method and system for time-of-flight detection. There may be two or more photodetectors in a photodetector circuit that capture photon activity. There is logic that processes the responses of the photodetectors and returns the leading edge of the arrival of the first photon and the leading edge of the arrival of the last photon, if at least two photons are received during an overlapping pulse width.

Abstract: A virtual training system and method are disclose. The system includes two-dimensional (2D) and three-dimensional (3D) image sensors, a biometric data sensor, a processor, and an output device. The 2D image sensor senses a 2D image of a user, and the 3D image sensor senses a 3D image of the user including a movement of the user. The biometric data sensor senses at least one biometric characteristic of the user. The processor generates feedback information in real time during a session relating to movement of the user compared to a standard form movement, which may be an exercise movement, a dance movement, a martial arts movement, or a physical therapy movement. Feedback is provided by the output device as an image of the user captured by at least one of the 2D image sensor and the 3D image sensor overlayed on an instructor avatar, which illustrates the standard form movement.