METHOD OF DEPTH IMAGE SIGNAL PROCESSING, DEPTH SENSOR OF THE SAME AND IMAGE SENSING SYSTEM OF THE SAME

摘要

PURPOSE: A depth image signal processing method, a depth sensor using the same, and an image sensing system including the same are provided to reduce power consumed for deriving depth information of a phase difference by outputting the depth information of the phase difference between an emitted optical signal and a reflected optical signal. CONSTITUTION: An image sensing system senses a first optical signal and a second optical signal(S10). The system designates one of eight phase areas as a sample area(S20). The system indicates remaining phase areas as a matching function based on the sample area. The system searches the phase areas for a phase difference between the first optical signal and the second optical signal and phase areas corresponding to polarity(S30). The system obtains a regression value from a difference value between the first and the second optical signals(S40). The system derives the phase difference of the first and the second optical signals from the regression value(S50). [Reference numerals] (AA) Start; (BB) End; (S10) Sensing a first optical signal emitted to a target object and a second optical signal received from the target object; (S20) Indicating each remaining phase area as a matching function based on a sampled area by designating one of eight phase areas as the sampled area; (S30) Searching for a phase area corresponding to the polarity and a phase difference of the first and the second optical signals; (S40) Calculating a regression value from a difference value between the first optical signal and the optical signal through a preset regression model implementing an inverse-sine function; (S50) Outputting a phase difference between the first and the second optical signals from the regression value based on the matching function corresponding to the searched phase area