Computer graphics processing and selective visual display system – Display driving control circuitry – Controlling the condition of display elements
Patent
1992-08-14
1994-09-13
Herndon, Heather R.
Computer graphics processing and selective visual display system
Display driving control circuitry
Controlling the condition of display elements
395155, 345179, G06F 1562
Patent
active
053476204
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
This invention relates to electronic image processing systems. Specifically, this invention relates to a system and apparatus to accurately simulate digitally the rendering of a printed articulation, stroke, or mark of a donor medium typically used in graphic arts, such as oil paints using a brush, pencils, colored pencils, felt pens, markers, crayons, charcoal erasers, and the like, and to accurately execute grainy or uneven characteristics, if desired, similar to those achieved on receptor media such as watercolor paper surfaces, cotton bond paper, cold and hot press papers, and canvas.
BACKGROUND ART
There are numerous standard computer peripherals available that allow "computer graphics" to be generated electronically. Typically these take the form of vector or raster displays with the input means provided by some form of touch tablet on which the user can draw and see the results of such work in real time on an electronic display.
The use of high resolution optical scanners to generate electronic, continuous tone raster image signals to depict continuous tone originals such as graphic art work and photographs is also well known. Usually the raster image signals are used in electronic plate making equipment to modulate a scanning laser beam, an electronic beam in a cathode ray tube, or the like, to fashion a facsimile of the continuous tone original on an appropriate printing master. The content of the original must be in a final form before the scanner generates the raster signals because limitations in the means to for making changes to the electrical image like touch up work, corrections, or modifications of artwork by an artist.
Normally, an artist changes shading, changes tone levels, corrects or modifies color hue, and erases or smears small defects. An artist also varies the shape of the tip of the implement used to render various artist effects, as well as filling in details, erases regions, and otherwise changes and modifies the artistic work. Such image retouching, when done electronically, is provided by devices which can be manipulated as if it were a brush or other implement by an operator viewing a cathode ray tube or other type display, to make corrections, modifications, or erasures to an electrical raster image during real time interaction between the user and the displayed image.
Such memory devices store the electrical signals representative of an image sought to be corrected or modified. The electrical image is made visible to an observer by providing the electrical signals to a display device. A brush tip image, for example, is created on the display over the visual image. The electrical brush usually includes a pointer device that is manipulated by the user to alter or touch up the continuous tone image. The pointer modifies the tone of the displayed image when it is moved in a brush like fashion and a button the pointer is depressed. Such movement of the pointer causes a like movement of the brush tip image. The motion and button depression allow the user to obtain image changes under the brush tip image with a stroking action which, with significant limitations, approaches that of an artist working on a painting.
In one well known embodiment, the pointer is activated by what is conventionally known as a mouse. The apparatus includes a ball bearing which is rolled over a surface to generate positive signals that move the image of the brush over the visual image on the display. The pointer may also include a plurality of buttons which are used to touch up images by simultaneously rolling the pointer over the surface and depressing one on the buttons to increase tone level of the signals in the memory corresponding to the signals in the region of the brush; to decrease the tone level image signals in the region of the brush; or to vary the size of the image of the brush tip when it depressed along with one of the other buttons. Numerous variations are available, such as hand held pointers, and varying the size or type of implement. Cursor and pointer devices are
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Hall Jeffrey A.
Herndon Heather R.
Smith Mike
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