Method for efficient coding of shape descriptor parameters
First Claim
Patent Images
1. A method of representing an object appearing in an image or sequence of images, by processing signals corresponding to the image or images, the method comprising:
- deriving a plurality of sets of co-ordinate values representing the shape of the object; and
quantising the co-ordinate values to derive a coded representation of the shape, wherein, for a first set of coordinate values having a value for a given co-ordinate less than the corresponding co-ordinate value in a second set of co-ordinate values, the number of bits allocated to the quantised representation of the given coordinate value for the first set of values is less than the number of bits allocated to the quantised representation of the corresponding co-ordinate value for the second set of values.
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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 sets of co-ordinate values representing the shape of the object and quantising the co-ordinate values to derive a coded representation of the shape, and further comprises quantising a first co-ordinate value over a first quantisation range and quantising a smaller co-ordinate value over a smaller range.
8 Citations
15 Claims
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1. A method of representing an object appearing in an image or sequence of images, by processing signals corresponding to the image or images, the method comprising:
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deriving a plurality of sets of co-ordinate values representing the shape of the object; and quantising the co-ordinate values to derive a coded representation of the shape, wherein, for a first set of coordinate values having a value for a given co-ordinate less than the corresponding co-ordinate value in a second set of co-ordinate values, the number of bits allocated to the quantised representation of the given coordinate value for the first set of values is less than the number of bits allocated to the quantised representation of the corresponding co-ordinate value for the second set of values. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
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13. An apparatus for representing an object appearing in an image or sequence of images, comprising:
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means for deriving a plurality of sets of co-ordinate values representing the shape of the object; and means for quantising the co-ordinate values to derive a coded representation of the shape; wherein, for a first set of coordinate values having a value for a given co-ordinate less than the corresponding co-ordinate value in a second set of co-ordinate values, the number of bits allocated to the quantised representation of the given coordinate value for the first set of values is less than the number of bits allocated to the quantised representation of the corresponding co-ordinate value for the second set of values.
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14. An apparatus searching for an object in an image or sequence of images, comprising:
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means for inputting a query object; means for deriving a representation of the query object; means for deriving a plurality of sets of co-ordinate values representing the shape of the object; means for quantising the co-ordinate values to derive a coded representation of the shape, wherein, for a first set of coordinate values having a value for a given co-ordinate less than the corresponding co-ordinate value in a second set of co-ordinate values, the number of bits allocated to the quantised representation of the given coordinate value for the first set of values is less than the number of bits allocated to the quantised representation of the corresponding co-ordinate value for the second set of values; means for comparing the representation of the query object with the coded representation of the shape; means for selecting and displaying those objects for which the representations indicate a degree of similarity to the query.
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15. A computer readable medium having stored thereon computer executable program for representing an object appearing in an image or sequence of images, by processing signals corresponding to the image or images, the program when executed causes a computer to perform the steps of:
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deriving a plurality of sets of co-ordinate values representing the shape of the object; and quantising the co-ordinate values to derive a coded representation of the shape, wherein, for a first set of co-ordinate values having a value for a given co-ordinate less than the corresponding co-ordinate value in a second set of co-ordinate values, the number of bits allocated to the quantised representation of the given co-ordinate value for the first set of values is less than the number of bits allocated to the quantised representation of the corresponding co-ordinate value for the second set of values.
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Specification