Graphic display apparatus having boundary detection target regio

Details Graphic display apparatus having boundary detection target regio Graphic display apparatus having boundary detection target regio

1986-09-24

1989-04-18

Harkcom, Gary V.

Boots, shoes, and leggings

340734, 340747, G06F 1572

Patent

active

048232823

ABSTRACT:
A boundary detection target region designating circuit includes a maximum value register in which a predetermined minimum value is initially set, and a minimum value register in which a predetermined maximum value is initially set. The content of the maximum value register is compared with a vertex coordinate of a boundary written in a boundary detection memory by a first comparator. If it is detected that the vertex coordinate is larger than the content of the maximum value register, the content of the maximum value register is updated to be the vertex coordinate by a first updating means. The content of the minimum value register is compared with the vertex coordinate by a second comparator. If it is detected that the vertex coordinate is smaller than the content of the minimum value register, the content of the minimum value register is updated to be the vertex coordinate by a second updating means. After a boundary write operation into the boundary detection memory is completed, maximum and minimum coordinates of a minimum rectangular region including all the boundaries of blanked-out regions are indicated by the maximum and minimum value registers.

REFERENCES:
patent: 4441104 (1984-04-01), Finney, II
patent: 4594673 (1986-06-01), Holly
patent: 4622545 (1986-11-01), Atkinson
patent: 4633415 (1986-12-01), Vink et al.
patent: 4642626 (1987-02-01), Bruce
patent: 4642790 (1987-02-01), Minshull et al.
patent: 4663617 (1987-05-01), Stockwell

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