Patent ID: 11875518
Assignee: NEC CORPORATION
Field: Computer technology (Electrical engineering)
Classification: CPC G | IPC G

Claim 0:
1. An object feature extraction device for analyzing at least one video, the object feature extraction device comprising:
at least one processor; and
at least one memory storing instructions executable by the at least one processor to:
generate frame images from the at least one video;
detect an object from the frame images, yielding in a detection result;
track the object based on the frame images and the detection result, yielding a tracking result;
store the frame images, the detection result, and the tracking result;
calculate, based on the detection result and the tracking result, a quality index for predicting quality of a feature of the object detected at an extraction time before a current time;
calculate a variation index for predicting a degree of variation improvement of the feature;
select, based on both the quality index and the variation index, the object to be subjected to feature extraction at the extraction time, yielding object selection information; and
extract the feature of the object detected from the frame images at the extraction time, based on the frame images at the extraction time, the detection result at the extraction time, and the object selection information.