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 Title: |
US4197590:
Method for dynamically viewing image elements stored in a random access memory array
[ Derwent Title ]
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| Country: |
US United States of America
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| Inventor: |
Sukonick, Josef S.; Cupertino, CA
Tilden, Greg J.; San Jose, CA
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| Assignee: |
NuGraphics, Inc., Cupertino, CA
other patents from NUGRAPHICS, INC. (411240) (approx. 2)
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| Published / Filed: |
1980-04-08
/ 1978-01-19
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| Application Number: |
US1978000870822
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| IPC Code: |
Advanced:
G09G 5/34;
G09G 5/39;
G09G 5/391;
G09G 5/393;
G09G 5/42;
Core:
G09G 5/36;
more...
IPC-7:
G06F 3/14;
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| ECLA Code: |
G09G5/34B; G09G5/39; G09G5/391; G09G5/393; G09G5/42; S09G212/00;
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| U.S. Class: |
Current:
715/781;
345/024;
345/441;
Original:
364/900;
340/721;
340/726;
340/731;
340/747;
340/750;
340/792;
340/799;
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| Field of Search: |
364/200 MS File,900 MS File,514,515
340/324 AD,721,723,724,731,726,747,750,792,799
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| Priority Number: |
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| Abstract: |
A computer graphics display system including random access raster memory for storing data to be displayed, a raster memory control unit for writing data into the raster memory, a video control unit for causing such information to be displayed on a CRT display screen, a micro control unit for controlling the function and timing of the raster memory control unit and the video control unit, and a computer adapted for facilitating data exchange between the micro control unit and a host computer. The displayed image can have extremely high complexity with essentially no problem of display flicker. Zoom and pan features allow the use of a very complex stored image in a flexible manner, and a split-screen technique enables an operator to work on a very complex picture at a detail level while still having an overview of the total picture, or any portion thereof, simultaneously presented before him. The split-screen feature also allows the simultaneous display of alphanumeric messages such as prompts, menus, or X-Y readouts added to the graphics display and a small area of the raster memory is usually reserved for this purpose. An XOR feature allows a selective erase that restores lines crossing or concurrent with erased lines. The XOR feature permits part of the drawing to be moved or "dragged" into place without erasing other parts of the drawing.
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| Attorney, Agent or Firm: |
Spensley, Horn, Jubas & Lubitz ;
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| Primary / Asst. Examiners: |
Nusbaum, Mark E.; Heckler, Thomas M.
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| Maintenance Status: |
B1 Re-examined
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| INPADOC Legal Status: |
Show legal status actions
Family Legal Status Report
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| Parent Case: |
This is a division of application Ser. No. 650,372, filed Jan. 19, 1976 now U.S. Pat. No. 4,070,710.
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| Family: |
Show 19 known family members
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First Claim:
Show all 16 claims |
What is claimed is:
1. A method of generating a graphics display having the illusion of smooth panning across an image represented by a plurality of discrete picture elements, said image being larger than that which can be displayed at one time on a video display device, comprising:
- storing in the storage sites of a memory device a set of digital data corresponding to the discrete picture elements of said image, selected subsets of said digital data being readable from said memory to produce a corresponding raster signal displayable by said video display device;
- specifying a first particular portion of said memory storage sites, said first particular portion containing a first subset of digital data corresponding to a first part of said image, said first part being displayable at one time on said video display device;
- selecting a second particular portion of said memory storage sites, said second particular portion containing a second subset of digital data corresponding to a different, second part of said image, said second part also being displayable at one time on said video display device,
- selecting a plurality of other portions of said memory storage sites, said other portions each containing a respective other subset of digital data corresponding to other parts of said image, said other parts being situated at contiguous spaced intervals in said image between said first part and said second part, each of said other parts also being displayable at one time on said video display device,
- initially reading out in raster fashion the first subset of digital data contained in said first portion to develop a first raster signal;
- sequentially reading out the other subsets of digital data in each of the other portions to develop a series of other raster signals;
- then reading out in raster fashion the second subset of digital data contained in said second portion to develop a second raster signal; and
- using said first raster signal, said other raster signals and said second raster signal in the order that they are developed to produce on said video display device a raster display of the data contained in the various selected portions such that the produced display creates the illusion of smooth panning across said image from said first part to said second part.
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| Background / Summary: |
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| Drawing Descriptions: |
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| Description: |
Show description
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| Forward References: |
Show 132 U.S. patent(s) that reference this one
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| Foreign References: |
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Publication |
Date |
IPC Code |
Assignee |
Title |
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JP46016772
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1971-05 |
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JP47039607
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1972-10 |
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JP50009256
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1975-04 |
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| Other Abstract Info: |
DERABS G77-G2016Y
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| Other References: |
Interpretation Systems Incorporated Product Release Document for Video/DMA Interface Unit Model VDI, Jun. 24, 1975.
Noll, "Scanned-Display Computer Graphics", Communications of the ACM, Mar. 1971, vol. 14, No. 3, pp. 143-150.
Cited by 6 patents
Dunn et al., "Parametric Description of a Scan-Display System", Proceedings of Spring Joint Computer Conference, 1969, pp. 187-206.
McCormick et al., "Image Processor for Biomedical Research", Computer Conf. Federation Proceedings, vol. 33, No. 12, Dec. 1974, pp. 2365-2368.
(4 pages)
Cited by 2 patents
Fischer et al., "Raster Graphics for Spatial Applications", Computer Graphics, vol. 9, No. 2, Summer 1975, pp. 1-8.
Aydin Controls Data Sheet for the Model 5214A Display Generator.
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