The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Jul. 21, 2015
Filed:
Jun. 29, 2012
Chunhui Cui, Hong Kong, HK;
Chun-fu Chen, Tainan, TW;
Ciao-siang Siao, Tainan, TW;
Gwo Giun Lee, Tainan, TW;
Yan Huo, Shenzhen, CN;
Chunhui Cui, Hong Kong, HK;
Chun-Fu Chen, Tainan, TW;
Ciao-Siang Siao, Tainan, TW;
Gwo Giun Lee, Tainan, TW;
Yan Huo, Shenzhen, CN;
Hong Kong Applied Science and Technology Research Institute Company Limited, Shatin, New Territories, HK;
Abstract
This invention discloses a method for object tracking, including determination of an area scaling ratio of the object in a video image sequence. In one embodiment, a centroid of the object is determined. One or more directed straight lines are selected, each passing through the centroid, extending from an end of the object's boundary to an opposite end thereof, and having a direction that is upward. A length scaling ratio for each directed straight line is determined by: determining a motion vector for each selected pixel on the line; computing a scalar component of the motion vector projected onto the line; estimating a change of the line's length according to the scalar components obtained for all pixels; and determining the length scaling ratio according to the change of the line's length. The area scaling ratio is computed based on the length scaling ratios for all directed straight lines.