	US 12,260,647 B2
	Measurement method
Takeshi Saitoh, Tokyo (JP)
Assigned to NEC Solution Innovators, Ltd., Tokyo (JP)
Appl. No. 17/781,089
Filed by NEC SOLUTION INNOVATORS, LTD., Tokyo (JP)
PCT Filed Nov. 19, 2020, PCT No. PCT/JP2020/043206 § 371(c)(1), (2) Date May 31, 2022, PCT Pub. No. WO2021/117457, PCT Pub. Date Jun. 17, 2021.
Claims priority of application No. 2019-222718 (JP), filed on Dec. 10, 2019.
Prior Publication US 2023/0005271 A1, Jan. 5, 2023
Int. Cl. G06V 20/52 (2022.01); G06T 7/70 (2017.01)

CPC G06V 20/53 (2022.01) [G06T 7/70 (2017.01); G06T 2207/30196 (2013.01); G06V 2201/07 (2022.01)]

10 Claims

1. A measurement method performed by a computer comprising:

acquiring, from a camera, a plurality of frames of image data;

detecting an umbrella and each of one or more heads in each frame;

generating, on each frame, a rectangle surrounding each detected head and a rectangle surrounding the detected umbrella;

for each head, generating a tracking line connecting the head between the frames;

generating a tracking line connecting the umbrella between the frames;

determining a number of associations satisfying a condition, each association including the umbrella and one of the heads; and

outputting a number of persons in the image data as the number of the associations satisfying the condition.