SCALE ROBUST FEATURE-BASED IDENTIFIERS FOR IMAGE IDENTIFICATION
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Abstract
A method for deriving an image identifier comprises deriving a scale-space representation of an image, and processing the scale-space representation to detect a plurality of feature points having values that are maxima or minima. A representation is derived for a scale-dependent image region associated with one or more of the detected plurality of feature points. In an embodiment, the size of the image region is dependent on the scale associated with the corresponding feature point. An image identifier is derived using the representations derived for the scale-dependent image regions. The image identifiers may be used in a method for comparing images.
93 Citations
74 Claims
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1-38. -38. (canceled)
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39. A method for deriving a representation of an image by processing signals corresponding to the image, the method comprising:
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deriving a scale-space representation of the image; processing the scale-space representation to detect a plurality of feature points having amplitude extrema; for one or more of the detected plurality of feature points, determining a scale-dependent image region associated with the corresponding feature point, and deriving a representation for each determined, scale-dependent image region. - View Dependent Claims (40, 41, 42, 43, 44, 45, 46, 47, 48, 49, 50, 51, 52, 53, 54, 55, 56, 57, 58, 59, 60, 61, 62, 63, 64, 65, 66, 67, 68, 69, 70, 71, 74)
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- 72. Apparatus as claimed in claim 72, comprising a control device for controlling operation thereof.
Specification