公开(公告)号：US09773192B2

公开(公告)日：2017-09-26

申请号：US14732738

申请日：2015-06-07

Applicant: Apple Inc.

Inventor： Xiaoxing Li ,  Geoffrey T. Anneheim ,  Jianping Zhou ,  Richard D. Seely ,  Marco Zuliani

IPC: G06K9/00 ,  G06K9/62 ,  G06T3/40 ,  G06T7/13 ,  G06T7/246 ,  G06T7/90

CPC classification number: G06K9/6202 ,  G06T3/40 ,  G06T7/13 ,  G06T7/248 ,  G06T7/90 ,  G06T2207/10016 ,  G06T2207/10024

Abstract: Techniques to identify and track a pre-identified region-of-interest (ROI) through a temporal sequence of frames/images are described. In general, a down-sampled color gradient (edge map) of an arbitrary sized ROI from a prior frame may be used to generate a small template. This initial template may be used to identify a region of a new or current frame that may be overscan and used to create a current frame's edge map. By comparing the prior frame's template to the current frame's edge map, a cost value or image may be found and used to identify the current frame's ROI center. The size of the current frame's ROI may be found by varying the size of putative new ROIs and testing for their congruence with the prior frame's template. Subsequent ROI's for subsequent frames may be identified to, effectively, track an arbitrarily sized ROI through a sequence of video frames.