METHOD, APPARATUS, COMPUTER PROGRAM, COMPUTER SYSTEM, AND COMPUTER-READABLE STORAGE MEDIUM FOR REPRESENTING AND SEARCHING FOR AN OBJECT IN AN IMAGE
First Claim
1. A method of representing an object appearing in an image or a sequence of images, by processing signals corresponding to the image or images, the method comprising deriving a curvature scale space (CSS) representation of an outline of an object starting from an arbitrary point on the outline, by smoothing the outline in a plurality of stages using a smoothing parameter, resulting in a plurality of outline curves, using values for points of inflection of each outline curve to derive curves characteristic of the original outline, and selecting first co-ordinates of peaks of said characteristic curves, which correspond to the smoothing parameter, and corresponding second co-ordinate values representing the positions on the outline corresponding to the peaks, the method comprising shifting one of the second co-ordinate values to zero, and shifting all the second co-ordinate values corresponding to said peaks by an amount equivalent to the original co-ordinate value of the co-ordinate value shifted to zero.
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Accused Products
Abstract
A method of representing an object appearing in a still or video image, by processing signals corresponding to the image, comprises deriving a plurality of numerical values associated with features appearing on the outline of an object starting from an arbitrary point on the outline and applying a predetermined ordering to said values to arrive at a representative of the outline.
12 Citations
12 Claims
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1. A method of representing an object appearing in an image or a sequence of images, by processing signals corresponding to the image or images, the method comprising deriving a curvature scale space (CSS) representation of an outline of an object starting from an arbitrary point on the outline, by smoothing the outline in a plurality of stages using a smoothing parameter, resulting in a plurality of outline curves, using values for points of inflection of each outline curve to derive curves characteristic of the original outline, and selecting first co-ordinates of peaks of said characteristic curves, which correspond to the smoothing parameter, and corresponding second co-ordinate values representing the positions on the outline corresponding to the peaks,
the method comprising shifting one of the second co-ordinate values to zero, and shifting all the second co-ordinate values corresponding to said peaks by an amount equivalent to the original co-ordinate value of the co-ordinate value shifted to zero.
Specification