Method and apparatus for representing and searching for an object using shape
First Claim
1. A method of representing an object appearing in an image, wherein the object appears in the image with a first two-dimensional outline in a first perspective view, by processing signals corresponding to the image, the method comprising:
- extracting the first two-dimensional outline of the object in the image;
deriving, using a curvature scale space representation, a view descriptor of the first two-dimensional outline of the object in the first perspective view;
identifying the object;
obtaining at least one additional outline of the object in a perspective view different from said first perspective viewderiving, using a curvature scale space representation, at least one additional view descriptor of an outline of the object in a perspective view different from said first perspective view; and
associating the two or more view descriptors to form an object descriptor.
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Accused Products
Abstract
A method is disclosed for representing a sequence of images constituting a moving image by processing signals corresponding to the image. An object appearing in one image is identified in the sequence in a first perspective view, and the same object appearing in another image is identified in the sequence in a second perspective view. A view descriptor of the outline of the object in the first perspective view is derived and at least one additional view descriptor of the outline of the object in another perspective view is also derived. The two or more view descriptors are associated to form a descriptor which is a single indexable entity for the sequence of images.
13 Citations
11 Claims
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1. A method of representing an object appearing in an image, wherein the object appears in the image with a first two-dimensional outline in a first perspective view, by processing signals corresponding to the image, the method comprising:
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extracting the first two-dimensional outline of the object in the image; deriving, using a curvature scale space representation, a view descriptor of the first two-dimensional outline of the object in the first perspective view; identifying the object; obtaining at least one additional outline of the object in a perspective view different from said first perspective view deriving, using a curvature scale space representation, at least one additional view descriptor of an outline of the object in a perspective view different from said first perspective view; and associating the two or more view descriptors to form an object descriptor. - View Dependent Claims (2, 3, 4, 9, 10, 11)
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5. A method of searching for an object in an image by processing signals corresponding to the image, the method comprising:
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inputting a query in the form of at least one two-dimensional outline of an object; deriving a descriptor of the query object; comparing said query descriptor with stored object descriptors for objects in images derived in accordance with a method comprising the steps of deriving a view descriptor of the first outline of the object and deriving at least one additional view descriptor of the outline of the object in a different view; and associating the two or more view descriptors to form an object descriptor, wherein the view descriptors are derived using a curvature scale space representation; and selecting and displaying at least one result corresponding to an image containing an object for which the comparison between the respective descriptor and the query descriptor indicates a degree of similarity between the query and said object. - View Dependent Claims (6, 7, 8)
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Specification