Method and apparatus for accessing horizontal sequences, vertica

Details Method and apparatus for accessing horizontal sequences, vertica Method and apparatus for accessing horizontal sequences, vertica

1975-03-03

1976-11-30

Boudreau, Leo H.

Communications: electrical

Digital comparator systems

3401725, G06F 1520

Patent

active

039952533

ABSTRACT:
A conventional word organized random access memory is modified for image processing operations so that the pq image points of any 1 .times. pq, pq .times. 1 or pxq subarray of an rp .times. sq or smaller image array stored in the memory can be extracted or updated in a single memory cycle. The invention contemplates 2 pq memory modules labeled from 0 to 2pq-1 for storing the image points, each module being capable of storing rs/2 points in distinguishable cells, only one cell of which is randomly accessible in a single instant of time. The invention further contemplates accessing circuitry for causing each image point I(i,j) of an image array to be routed to or from a memory module M(i,j) according to the relation M(i,j)=pq[(i/p)//2]+ (iq+i/2p+j)//pq, where the notations "/" and "//" denote, respectively, the quotient and the remainder resulting from integer division. The accessing circuitry additionally causes image point I(i,j) to be stored into or retrieved from a cell location A(i,j) of module M(i,j) according to the relation A(i,j)=(i/2p)s+(j/q).

REFERENCES:
patent: 3492646 (1970-01-01), Bene et al.
patent: 3889234 (1975-06-01), Makihara et al.
patent: 3899771 (1975-08-01), Saraga et al.
patent: 3938102 (1976-02-01), Morrin et al.
Lewitan, "N Tables In One," IBM Tech. Disclosure Bulletin, vol. 13, No. 8, Jan., 1971, pp. 2182-2183.

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