US 12,293,531 B2
Depth sensing system and depth sensing method
Wu-Feng Chen, Tainan (TW); Ching-Wen Wang, Tainan (TW); Cheng Che Tsai, Tainan (TW); and Hsueh-Tsung Lu, Tainan (TW)
Assigned to HIMAX TECHNOLOGIES LIMITED, Tainan (TW)
Filed by HIMAX TECHNOLOGIES LIMITED, Tainan (TW)
Filed on Jan. 10, 2023, as Appl. No. 18/152,741.
Prior Publication US 2024/0233152 A1, Jul. 11, 2024
Int. Cl. G06K 9/00 (2022.01); G06T 7/50 (2017.01); H04N 25/705 (2023.01)
CPC G06T 7/50 (2017.01) [H04N 25/705 (2023.01)] 20 Claims
OG exemplary drawing
 
1. A depth sensing method, comprising:
obtaining a sensed target data set via a depth sensing module, wherein the sensed target data set comprises pixel data and corresponding range data, the pixel data comprise a position value corresponding to a pixel of optical center of the depth sensing module and a measuring position value corresponding to a measuring pixel of the depth sensing module, and the range data comprise a range value corresponding to the pixel of optical center and a range value corresponding to the measuring pixel;
calculating a period number corresponding to the measuring pixel, wherein calculating the period number of the sensed target data set comprising:
calculating a spatial ratio in accordance with the position value of the pixel of optical center, the measuring position value of the measuring pixel, and a focal length of the depth sensing module;
calculating a basic range in accordance with the spatial ratio and an unit depth, wherein the unit depth is the range value of the pixel of optical center; and
calculating the period number corresponding to the measuring pixel in accordance with the range value of the measuring pixel, the basic range and a period distance of a single-frequency modulated light, wherein the period number in an integer greater than or equal to zero; and
calculating an actual range value or an actual depth of the measuring pixel in accordance with the period number.