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:
Jun. 06, 1989
Filed:
Jun. 12, 1987
Akira Kasano, Tokyo, JP;
Kabushiki Kaisha Toshiba, Kawasaki, JP;
Abstract
According to this invention, in image data A and B which are respectively constituted by pixel groups .SIGMA.A.sub.ij and .SIGMA.B.sub.ij consisting of N pixels A.sub.ij and B.sub.ij (N is a positive integer; i and j respectively indicate a row position and a column position), and in which density data A.sub.dij and B.sub.dij of the pixels are expressed by n(2m)-bit data (n and m are positive integers), designated 2m-bit portion a.sub.ij of each density data A.sub.dij of image data A is divided into upper m-bit portion a.sub.uij and lower m-bit portion a.sub.Lij. A histogram processor calculates .SIGMA.a.sub.ij .multidot.b.sub.ij between 2m-bit portions a.sub.ij and b.sub.ij using a histogram obtained by the upper or lower m-bit portion a.sub.uij or a.sub.Lij and designated 2m-bit portion b.sub.ij of each density data B.sub.dij of pixel group .SIGMA.B.sub.ij. An average can also be calculated by a calculation section using the histogram. Therefore, a covariance can be calculated at high speed.