Video image generator
First Claim
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1. Apparatus for producing a video background image formed of a plurality of raster-oriented horizontal lines in successive scan frames with apparent motion provided in response to motion control signals comprising:
- pattern generator means for providing a plurality of background patterns which are produced sequentially frame by frame to provide a visual appearance of forward movement, said pattern generator means including a line pattern memory for storing at addressable locations line patterns for producing said horizontal lines to form said background patterns, and a pattern sequence memory coupled to said line pattern memory for storing a plurality of pattern sequences which select said line patterns in said line pattern memory to produce said background patterns, each said pattern sequence providing a line pattern address for each said horizontal line of said background image, and vertical control means coupled to said pattern sequence memory and responsive to said motion control signals for selecting a one of said stored plurality of pattern sequences and for controlling the rate of selection of said stored pattern sequences whereby said background patterns are produced sequentially to change the rate of apparent forward movement.
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Abstract
A video image generator for producing a background image giving the visual appearance of an ocean on a raster type video screen. The image generating circuitry includes means for producing background patterns in successive scan frames of the raster to provide a visual appearance of forward movement. Apparent lateral movement is also provided by shifting the image horizontally. Such visual movement is provided in response to motion control signals associated with video games or the like.
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Citations
9 Claims
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1. Apparatus for producing a video background image formed of a plurality of raster-oriented horizontal lines in successive scan frames with apparent motion provided in response to motion control signals comprising:
pattern generator means for providing a plurality of background patterns which are produced sequentially frame by frame to provide a visual appearance of forward movement, said pattern generator means including a line pattern memory for storing at addressable locations line patterns for producing said horizontal lines to form said background patterns, and a pattern sequence memory coupled to said line pattern memory for storing a plurality of pattern sequences which select said line patterns in said line pattern memory to produce said background patterns, each said pattern sequence providing a line pattern address for each said horizontal line of said background image, and vertical control means coupled to said pattern sequence memory and responsive to said motion control signals for selecting a one of said stored plurality of pattern sequences and for controlling the rate of selection of said stored pattern sequences whereby said background patterns are produced sequentially to change the rate of apparent forward movement. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. Apparatus for producing a video background image on a display screen of the type having an image-forming beam that traverses said screen to form a plurality of successive horizontal lines and for providing said video background image with a visual appearance of perspective comprising:
means for storing a plurality of line patterns for providing repetitive variations of video chrominance and/or luminance, means for selecting at least one of said line patterns for each said horizontal line, means for generating said selected line patterns for each of said horizontal lines, and size control means for controlling the time duration of said repetitive variation for each of said horizontal lines, said size control means providing smaller variations on horizontal lines appearing nearest the top of the background image and progressively larger variations on the horizontal lines appearing below said top line to provide a visual appearance of perspective.
Specification