Apparatus for varying the size and shape of an image in a raster

Details Apparatus for varying the size and shape of an image in a raster Apparatus for varying the size and shape of an image in a raster

1985-02-12

1988-06-28

Curtis, Marshall M.

Communications: electrical

Land vehicle alarms or indicators

Internal alarm or indicator responsive to a condition of the...

340729, 340735, 340747, G09G 116

Patent

active

047542705

ABSTRACT:
A displaying apparatus using a raster scanning type display such as a CRT, wherein vertical and horizontal positions are addressed respectively by an address counter for displaying an image stored in a character memory containing a matrix of horizontal and vertical dot information. Start address data, for locating the position of the image on the display, is loaded into vertical address and horizontal address counters which are then incremented by a carry output from horizontal and vertical adders respectively associated with the horizontal and vertical counters. The adder for the vertical address counter repeats adding operations according to predetermined addend data four times in one horizontal blanking period and twice in one vertical blanking period. The adder for the horizontal address counter repeats adding operations according to predetermined addend data at intervals selected to be a fraction, e.g. 1/4th, the usual horizontal dot interval. By appropriate setting of the addend data, the size of characters and the associated images on a CRT screen can be enlarged or reduced with respect to a nominal size. Moreover, the start address and addend data described above are renewed at the beginning of every horizontal line so that the characters images can be displayed at skewed angles, such as in a perspective view.

REFERENCES:
patent: 3638216 (1972-01-01), Brewster
patent: 3786477 (1974-01-01), Baumgartner
patent: 3958232 (1976-05-01), Hobrough et al.
patent: 4107665 (1978-08-01), Mayer et al.
patent: 4242678 (1980-12-01), Somerville

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