US 12,008,765 B2
Candidate region estimation device, candidate region estimation method, and program
Yukito Watanabe, Tokyo (JP); Shuhei Tarashima, Tokyo (JP); Takashi Hosono, Tokyo (JP); Jun Shimamura, Tokyo (JP); and Tetsuya Kinebuchi, Tokyo (JP)
Assigned to NIPPON TELEGRAPH AND TELEPHONE CORPORATION, Tokyo (JP)
Appl. No. 17/265,166
Filed by NIPPON TELEGRAPH AND TELEPHONE CORPORATION, Tokyo (JP)
PCT Filed Aug. 1, 2019, PCT No. PCT/JP2019/030292
§ 371(c)(1), (2) Date Feb. 1, 2021,
PCT Pub. No. WO2020/027282, PCT Pub. Date Feb. 6, 2020.
Claims priority of application No. 2018-145608 (JP), filed on Aug. 2, 2018.
Prior Publication US 2021/0304415 A1, Sep. 30, 2021
Int. Cl. G06T 7/12 (2017.01); G06T 7/11 (2017.01); G06T 7/136 (2017.01)
CPC G06T 7/12 (2017.01) [G06T 7/11 (2017.01); G06T 7/136 (2017.01)] 20 Claims
OG exemplary drawing
 
1. A candidate region estimation apparatus configured to, for each of a plurality of target objects, estimate a candidate region that is a candidate for a region including said each target object, in an image including the plurality of target objects, the candidate region estimation apparatus comprising a processor configured to:
receive input of the image and region information indicating a region including at least one of the plurality of target objects included in the image;
detect boundary lines in the image using a Canny method and a plurality of types of predetermined parameters;
determine a parameter to be used when detecting boundary lines in the image, based on a ratio between a density of boundary lines included in the image and a density of boundary lines in a region indicated by the region information;
detect a boundary line in the image using the parameter; and
estimate for each of the plurality of target objects included in the image, the candidate region of said each target based on the boundary lines detected by the boundary line detector.