This paper reviews the state-of-the art in the field of lock-in ToF cameras, their advantages, their limitations, the existing calibration methods, and the way they are being used, sometimes in combination with other sensors. Even though lockin ToF cameras provide neither higher resolution nor larger ambiguity-free range compared to other range map estimation systems, advantages such as registered depth and intensity data at a high frame rate, compact design, low weight and reduced power consumption have motivated their increasing usage in several research areas, such as computer graphics, machine vision and robotics.


computer vision.

Scientific reference

S. Foix, G. Alenyà and C. Torras. Lock-in time-of-flight (ToF) cameras: a survey. IEEE Sensors Journal, 11(9): 1917-1926, 2011.