Patent ID: 8611610
Filing Date: 2013-12-17
Classification: G06T

Abstract:
1. A method of extracting distance information, the method comprising: projecting a plurality of different lights onto an object; modulating, by a light modulator having a gain, reflected lights reflected from the object into modulated images; detecting, by a photodetector, the modulated images and obtaining from the modulated images a plurality of intensity images respectively corresponding to the plurality of different lights; obtaining a phase delay of each of the reflected lights from the plurality of intensity images; and calculating a distance to the object from the obtained phase delay, wherein the obtaining of the phase delay comprises referring to a lookup table that stores information obtained by measuring the waveforms of the plurality of different lights and the gain of the light modulator, wherein the lookup table associates the phase delay, the waveforms of the lights projected onto the object, and the gain of the light modulator with each other.