Memory system for storing two-dimensional digitized image signals

Claim 1

A memory system for storing a two dimensional digitized image signal consisting of a plurality of pixels arranged in (2 M +X) columns and (2 N +Y) rows, wherein X and Y do not exceed 2 M-2 and 2 N-1 , respectively, and M and N are positive integers, comprising: means for generating (M+N+2) bits of a virtual address having (M+1) bits of a horizontal address component representing said (2 M +X) columns and (N+1) bits of a vertical address component representing said (2 N +Y) rows; memory means, having storage locations of 2 M+N+1 , for storing the two dimensional digitized image signal, each of the storage locations capable of storing one pixel data therein and addressable by (M+N+1 bits) of a physical address; and mapping means for changing the virtual address to the physical address, wherein said mapping means utilizes a most significant bit of the horizontal address component and that of the vertical address component constituting the virtual address to regionalize the storage locations of said memory means into four regions so as to map the virtual address to the physical address on a region-by-region basis.