Image display control apparatus

Claim 2

An image display control apparatus characterized by comprising: a display unit (16); an image memory (17) capable of storing larger picture element data than the number of picture elements on the screen of said display unit (16); write control means (21) for writing a plurality of groups of picture element data into a plurality of memory locations of said image memory (17); a mapping memory (22) for storing address data for specifying the memory locations for the groups of picture element data in said image memory (17), in order to correspondingly display the picture element data groups on a plurality of display segments in the screen of said display unit (16); means (14, 19) for reading out the address data from said mapping memory (22) in the display order of said display unit (16); and means (23, 24) for reading out from said image memory (17) the picture element data group specified by the address data read out, and for supplying the picture element data read out to said display unit (16).

Claim 3

An image display control apparatus according to claim 1, characterized in that said address data readout means includes means (30) for simultaneously reading out the plurality of address data from said mapping memory (22a), and means (23) for reading out the plurality of picture element data groups from said image memory (17), using the plurality of the read out address data.

Claim 4

An image display control apparatus according to claim 2, characterized in that the memory locations of said mapping memory (22a) store the plurality of address data and the operating data for editing the plurality of address data, and said means (23, 34) for supplying image data to said display unit (16) includes means (34) for editing the plurality of picture element data groups on the basis of the operating data read out from said mapping memory (22a).

Claim 5

An image display control apparatus according to claim 3, characterized in that said editing means includes a plurality of registers (31, 32) for storing the plurality of picture element data groups read out of said image memory (17), an arithmetic operation unit (34) for executing an operation of the plurality of picture element data groups supplied from said registers (31, 32) by using the operating data, to thereby compose picture element data blocks, and a shift register (15) for storing the output from said arithmetic operation unit (34).

Claim 6

An image display control apparatus according to claim 3, characterized in that the operating data stored in the memory locations of said mapping memory (22a) contains masking data including start and end bits to designate an unnecessary part of each of the plurality of picture element data groups.

Claim 7

An image display control apparatus according to claim 1, characterized in that said image memory (17) includes: n image memories (17a, 17b) with address corresponding to X dots for horizontal and Y dots for vertical (X and Y being each integer); means (45) for writing the picture element data of an image composed of (n.X) dots for horizontal and (n.Y) dots for vertical into said image memories (17a, 17b) while said picture element data are divided into staggered n data blocks; means (43, 44) for simultaneously accessing an address (X.y + [x/n]) (where [x/n] is an integer part of x/n) or an address (X.y + [x/n] + 1) in said n image memories on the basis of locations of n picture elements in reading out the picture element data of n dots horizontally and successively arranged from a picture element location (x.y) (where x and y are each integer and expressed by x = 0 to n(x-l) and y = 0 to n(Y-1)); and means (43, 44) for simultaneously accessing an address (X.y + [x/n] + m.X) (where m is an integer and given by m = 0 to n-1) in writing and reading the picture element data of n dots vertically and successively arranged from the picture element location (x.y).

Claim 8

An image display control apparatus according to claim 6, characterized in that said simultaneous access means includes control means (45) for selecting said address (X.y +[x/n]) or said address (X.y + [x/n] + 1) on the basis of the locations of the picture elements in one of the staggered n data blocks.

Claim 9

An image display control apparatus according to claim 6, characterized in that said write means includes picture element interchange means (48, 49) for interchanging the picture element data in their arranged order on the basis of the picture element locations in one of the staggered n data blocks.