Patent EP0202747A2 successfully refreshed from Google Patents.
EP0202747A2
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EP
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Improvements in or relating to video image creation systems
Assignee: Quantel Ltd
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Filing: 1986-04-07
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Granted: —
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Expires: 2006-04-07
Abstract
Abstract A system for creating video images by 'drawing' on a touch tablet with a stylus. Addresses designated by the stylus are translated by a computer (16) into addresses in a frame delay store (13). The operator may choose an artists implement, the effect of which is to simulated in the image by brush stamp signals representing the distribution power of the implement. Brush stamp signals are provided for a patch of signals round a designated address. During a frame period the brush stamp signals are processed to produce signals representing the effect of overlapping brush stamps for a portion of line drawn in that period. The store is a frame delay store where the stored signals are continuously recycled. During a cycle of the store signals corresponding to the addresses covered by the brush stamps are sequentially up-dated by combining with incoming video signals in proportions determined by the brush signals. This produces the effect on a screen of a line drawn with the chosen implement.
Inventors
- 👤 Barry Donald Ruberry Miles
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-07 01:57
CPC Classifications
G; G06; G06F; G06F3/00; G06F3/01; G06F3/048; G06F3/0484; G06F3/04845; G06T; G06T11/00; G06T11/10
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
127 words
A video image creation system comprising operator controlled means (21) for designating points in a line to be produced on an image, means (16) for providing brush stamp signals, a store (13) for video signals representing the image, means (12) for processing signals from said store with incoming video signals in response to said brush stamp signals, and means (23) for displaying said signals from said store, characterised by, means (19) for generating a patch of signals representing the video effect of successive overlapping brush stamps along said line, means (22) for reading video signals from said store, and said processing means operating to update the signals in said store once per reading cycle thereof in response to video effect signals generated during a preceding cycle period.
Claim 2
Dependent Claim
127 words
A video image creation system comprising operator controlled means (21) for designating points in a line to be produced on an image, means (16) for providing brush stamp signals, a store (13) for video signals representing the image, means (12) for processing signals from said store with incoming video signals in response to said brush stamp signals, and means (23) for displaying said signals from said store, characterised by, means (19) for generating a patch of signals representing the video effect of successive overlapping brush stamps along said line, means (22) for reading video signals from said store, and said processing means operating to update the signals in said store once per reading cycle thereof in response to video effect signals generated during a preceding cycle period.
Claim 3
Dependent Claim
42 words
A system as in claim 1 further characterised in that said operator controllable means comprises a touch tablet and a stylus and said generating means operates to generate a patch of video effect signals in dependence on the pressure on the stylus.
Claim 4
Dependent Claim
22 words
A system as in claim 1 further characterised in that said store is a frame delay store updatable once a frame period.
Claim 5
Dependent Claim
59 words
A system as in claim 3 further characterised in that said means for generating a patch of signals generates signals representing the video effect of successive overlapping brush stamps along the portion of the line designated in a frame period, and said processing means updates the corresponding signals in said store during one cycle of the frame delay store.
Claim 6
Dependent Claim
45 words
A system as in claim 4 characterised in that said processing means updates the corresponding signals by combining, for each address, an incoming video signal with the signal stored at that address in the frame delay store in proportions determined by the video effect signals.
Claim 7
Dependent Claim
27 words
A video image creation system as in claim 3 characterised in that said updating means updates the signals during the refresh cycle of the frame delay store.
Claim 8
Dependent Claim
35 words
A video image creation system as in claim 1 characterised in that said store comprises a random access store and in that said processing means updates the signals during the blanking intervals of the store.
Claim 9
Dependent Claim
103 words
A video image creation system comprising; operator controlled means (21) for designating points on an image to be created, means (16) for generating brush stamp signals for controlling the video effect of signals to be used in the image, and means (13) for storing colour video signals representing an image characterised by, means (25, 26) for multiplying factors related to successive brush stamp signals for a point to generate a signal representing the effect of overlapping brush stamps, said store means being updated at intervals and means (12) for updating the signals in said store at intervals in response to said generated signals.
Claim 10
Dependent Claim
103 words
A video image creation system comprising; operator controlled means (21) for designating points on an image to be created, means (16) for generating brush stamp signals for controlling the video effect of signals to be used in the image, and means (13) for storing colour video signals representing an image characterised by, means (25, 26) for multiplying factors related to successive brush stamp signals for a point to generate a signal representing the effect of overlapping brush stamps, said store means being updated at intervals and means (12) for updating the signals in said store at intervals in response to said generated signals.
Claim 11
Dependent Claim
23 words
A system as in claim 8 further characterised in that said store means is a frame delay store updatable once a frame period.
Claim 12
Dependent Claim
51 words
A system as in claim 8 further characterised by subtractor means (24) for producing a signal representing one minus the generated signal, and said means for updating the signals in said store includes means for combining incoming video signals with stored signals in proportions determined by said signal from said subtractor.
Claim 13
Dependent Claim
145 words
A video image creation system comprising a store for video signals representing image points on the image, means for setting up a signal representing a desired colour, means for producing a sequence of brush stamps defining a stroke in said image, each brush stamp comprising a plurality of distribution signals representing the distribution of said colour in said image at a patch of image points, the brush stamps defining a stroke including overlapping stamps so that a plurality of signals represent distributions of said colour to individual points in said image, characterised by, means for combining the distribution signals for individual image points to produce video effect signals for the respective points, and means for updating the video signal in said store for particular image points in response to the stored video signal for the point, said colour signal and the respective video effect signal.
Claim 14
Dependent Claim
145 words
A video image creation system comprising a store for video signals representing image points on the image, means for setting up a signal representing a desired colour, means for producing a sequence of brush stamps defining a stroke in said image, each brush stamp comprising a plurality of distribution signals representing the distribution of said colour in said image at a patch of image points, the brush stamps defining a stroke including overlapping stamps so that a plurality of signals represent distributions of said colour to individual points in said image, characterised by, means for combining the distribution signals for individual image points to produce video effect signals for the respective points, and means for updating the video signal in said store for particular image points in response to the stored video signal for the point, said colour signal and the respective video effect signal.
References Cited (Backward Citations)
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