US 11,818,361 B2
Data compression apparatus, data compression method, and program
Masaru Takagi, Musashino (JP); Kazuya Matsuo, Musashino (JP); Lidwina Ayu Andarini, Musashino (JP); Jun Shioda, Musashino (JP); Ryota Nakada, Musashino (JP); Koya Mori, Musashino (JP); Tomohiro Inoue, Musashino (JP); and Masahiro Yoshida, Musashino (JP)
Assigned to NIPPON TELEGRAPH AND TELEPHONE CORPORATION, Tokyo (JP)
Appl. No. 17/438,224
Filed by NIPPON TELEGRAPH AND TELEPHONE CORPORATION, Tokyo (JP)
PCT Filed Dec. 17, 2019, PCT No. PCT/JP2019/049407
§ 371(c)(1), (2) Date Sep. 10, 2021,
PCT Pub. No. WO2020/183839, PCT Pub. Date Sep. 17, 2020.
Claims priority of application No. 2019-046833 (JP), filed on Mar. 14, 2019.
Prior Publication US 2022/0191511 A1, Jun. 16, 2022
Int. Cl. H04N 19/159 (2014.01); H04N 19/186 (2014.01)
CPC H04N 19/159 (2014.11) [H04N 19/186 (2014.11)] 9 Claims
OG exemplary drawing
 
1. A data compression apparatus comprising: a processor configured to:
acquire point cloud data including sets each including a direction and a distance from a ranging sensor;
generate a bitmap image based on directions and distances in the sets; and
apply a predetermined image compression technique to the bitmap image,
convert the directions and the distances in the sets into color signals, and
generate the bitmap image by mapping the color signals into a two-dimensional data structure in accordance with the directions,
generate a first bitmap image based on upper bits of the color signals and generate a second bitmap image based on lower bits of the color signals,
wherein the predetermined image compression technique includes a first image compression technique and a second image compression technique different from the first image compression technique, and
apply the first image compression technique to the first bitmap image and apply the second image compression technique to the second bitmap image.