Method for realizing high-speed statistic operation processing and image data processing apparatus for embodying the method

摘要

According to this invention, in image data A and B which are respectively constituted by pixel groups ΣAijand ΣBij consisting of N pixels Aij and Bij (N is a positive integer; and j respectively indicate a row position and a column position), and in which density data Adij and Bdij of the pixels are expressed by n(2m)-bit data (n and m are positive integers), designated 2m-bit portion aij of each density data Adijof image data A is divided into upper m-bit portion auijand lower m-bit portion aLij. A histogram processor (16) calculates Σaij•bij between 2m-bit portions aij and bij using a histogram obtained by the upper or lower m-bit portion aUij or aLij and designated 2m-bit portion bijof each density data Bdij of pixel group ΣBij. An average can also be calculated by a calculation section (32) using the histogram. Therefore, a covariance can be calculated at high speed.