Local zoom for raster scan displays

Details Local zoom for raster scan displays Local zoom for raster scan displays

1984-06-22

1985-10-08

Curtis, Marshall M.

Communications: electrical

Land vehicle alarms or indicators

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

340724, 340750, G09G 116

Patent

active

045463492

ABSTRACT:
Apparatus for selectively extracting, magnifying and juxtapositioning selected areas of a raster scan image relative to the primary image so as to permit an observer to better view selected areas of the primary image while still viewing the entire primary image. The apparatus essentially comprises means for sampling x and y radar address data and related video data, means for independently and selectively scaling and offsetting the address data for a primary image memory and for a local zoom memory and means for selecting the areas of the primary image that are to be magnified. The selected areas of the primary image are displayed at a rate defined by a zoom magnification factor, scaled and offset independent of the primary image--but relative to the local zoom area, and displayed by extracting the data from the local zoom memory, rather than the primary image memory, as the display raster scans the areas of the screen where the zoom image is to be displayed.

REFERENCES:
patent: 3437873 (1969-04-01), Eggert
patent: 4091374 (1978-05-01), Muller
patent: 4107662 (1978-08-01), Endo et al.
patent: 4197590 (1980-04-01), Sukonick
patent: 4257044 (1981-03-01), Fukuoka

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