Patent ID: 11869199
Assignee: OMRON CORPORATION
Field: Audio-visual technology (Electrical engineering)
Classification: CPC G  H | IPC G

Claim 0:
1. An object tracking device that tracks an object present in a to-be-tracked area by using a fisheye image obtained by a fisheye camera installed above the to-be-tracked area, the object tracking device comprising:
a storage storing in advance a reference for a movement amount of the object between frames for each position or area on the fisheye image;
a processor executing a process that causes the object tracking device to:
determine, based on a position of the object in a first frame image and the reference for a movement amount associated with the position of the object in the first frame image, a position of a search area in a second frame image subsequent to the first frame image; and
search the search area in the second frame image for the object to specify a position of the object in the second frame image,
wherein the storage stores in advance a reference for a degree of distortion of an image for each position or area on the fisheye image,
wherein the position of the search area in the second frame image is determined based on the position of the object in the first frame image, the reference for a movement amount associated with the position of the object in the first frame image, a movement direction of the object, and the reference for a degree of distortion associated with the position of the object in the first frame image, and
wherein a position of the search area in a direction identical to the movement direction of the object is determined based on the position of the object in the first frame image, a position of the object in a frame image previous to the first frame image, and the reference for a movement amount, and a position of the search area in a direction orthogonal to the movement direction of the object is determined based on the position of the search area in the direction identical to the movement direction of the object and the reference for a degree of distortion.