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

Claim 7:
8. An object feature extraction method for analyzing at least one video, the object feature extraction method comprising:
generating, by the processor, frame images from the at least one video;
detecting, by the processor, an object from the frame images, yielding a detection result;
tracking, by the processor, the object based on the frame image and the detection result, yielding a tracking result;
storing, by the processor, the frame images, the detection result, and the tracking result;
calculating, by the processor, 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;
calculating, by the processor, a variation index for predicting a degree of variation improvement of the feature;
selecting, by the processor and 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
extracting, by the processor and based on the frame images at the extraction time, the detection result at the extraction time, and the object selection information.