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:
Sep. 26, 2006
Filed:
Feb. 26, 2001
Bernhard K. Schiefer, Pickering, CA;
Jarek Gryz, Toronto, CA;
Jeff Edmonds, Toronto, CA;
Renee J. Miller, Toronto, CA;
Bernhard K. Schiefer, Pickering, CA;
Jarek Gryz, Toronto, CA;
Jeff Edmonds, Toronto, CA;
Renee J. Miller, Toronto, CA;
International Business Machines Corporation, Armonk, NY (US);
Abstract
Determining maximal empty rectangles in a binary matrix includes building values in a staircase data structure for each successive entry in the matrix. The values in the staircase data structure are removed where the values correspond to maximal rectangles having the successive entry in the bottom right corner of the rectangle. The values in the staircase data structure for each successive entry being determinable from values in the staircase data structure for a preceding entry in the matrix. The maximal empty rectangles providing a basis for generating efficient relational join operations on defined relational tables.