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(12) United States Patent ao) Patent No.: us 6,546,117 Bi
Sun et al. (45) Date of Patent: Apr. 8,2003
(54) VIDEO OBJECT SEGMENTATION USING ACTIVE CONTOUR MODELLING WITH GLOBAL RELAXATION
(75) Inventors: Shijun Sun, Seattle, WA (US);
Yongmin Kim, Seattle, WA (US)
(73) Assignee: University of Washington, Seattle, WA (US)
( * ) Notice: Subject to any disclaimer, the term of this patent is extended or adjusted under 35 U.S.C. 154(b) by 0 days.
(21) Appl. No.: 09/323,501
(22) Filed: Jun. 10, 1999
(51) Int. CI.7 G06K 9/00; G06K 9/62
(52) U.S. CI 382/103; 382/215
(58) Field of Search 382/103, 199,
382/224, 294, 215; 345/442; 600/443
(56) References Cited
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(List continued on next page.)
Primary Examiner—Amelia M. Au
Assistant Examiner—Martin Miller
(74) Attorney, Agent, or Firm—Steven P. Koda
A system for image object tracking and segmentation, includes (i) a modified adaptive resonance theory-2 (M-ART2) model for detecting changes of scenes, (ii) a two-dimensional correlative autopredicitve search (2D CAPS) method for object tracking, (iii) a derivation of contour energy for use in modelling an object edge, and (iv) an active contour model with global relaxation for defining optimal image object boundaries. The modelled object boundary is derived from an edge potential energy calculation and a set of current edge points. For each edge point, several candidate data points are also selected. Rather than calculate an energy value for each potential contours, a solution is achieved by comparing energy differences along a travel path. The selected contour is built in steps. An optimal path is selected from the potential paths.
20 Claims, 9 Drawing Sheets
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