The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Apr. 21, 2009
Filed:
Mar. 22, 2006
Lars Engebretsen, Zurich, CH;
Lars Engebretsen, Zurich, CH;
Google Inc., Mountain View, CA (US);
Abstract
One embodiment of the present invention provides a system that produces an object signature for an object, wherein the object comprises a set of features. During operation, the system first initializes a k-dimensional state vector {s, s, . . . , s}containing floating-point numbers. Next, for each occurrence of each feature in the object, the system (1) computes a random-number seed from the feature; (2) generates k pseudo-random floating-point numbers {X, X, . . . , X} using the random-number seed, wherein each X(iε[1, k]) is generated in accordance with an α-stable distribution, wherein 1≦α<2; and (3) updates each floating-point number sin the k-dimensional state vector using an associated pseudo-random floating-point number X. The system then produces the object signature for the object by condensing the k-dimensional state vector. Note that using an α-stable distribution with 1≦α<2 to generate the k pseudo-random floating-point numbers for each feature reduces the influence of multiple occurrences of a given feature on the object signature.