Facsimile and static presentation processing – Facsimile – Specific signal processing circuitry
Patent
1991-05-03
1993-06-15
Groody, James J.
Facsimile and static presentation processing
Facsimile
Specific signal processing circuitry
358160, H04N 5262
Patent
active
052204286
DESCRIPTION:
BRIEF SUMMARY
This invention relates to a method and apparatus for use with a digital video effects system to allow a variety of curved surface effects to be produced.
Existing systems to produce curved effects suffer from some or all of the following defects. Firstly they produce poor quality interpolation and edges, secondly they cannot expand the picture without loss of definition and thirdly they require excessive quantities of computation in order to produce a simple effect.
It is an object of the present invention to provide a means by which at least some of these disadvantages are overcome or at least reduced.
The invention accordingly provides a method for processing stored video images to reproduce image information from one image frame of a video signal so that it appears within another image frame of a video signal as if transposed onto a curved surface, comprising the steps of generating a first set of co-ordinate signals the values of which represent the co-ordinate positions of image information within a store containing the picture information of said one image frame, transforming the values of said first set of co-ordinate signals according to functions defining the desired curved surface in order to derive a second set of co-ordinate signals the values of which represent the co-ordinate positions within said other image frame at which the said curved surface will appear, addressing a data store with said second set of co-ordinate signals whilst writing into said data store the values of said first set of co-ordinate signals whereby at each co-ordinate address of the store defined by values of said second set of signals there are stored the corresponding values of the first set of signals, and addressing said data store with a third set of co-ordinate signals the values of which correspond to the co-ordinate positions of picture information to appear in said other image frame whilst addressing the store containing the picture information of said one image frame with the corresponding co-ordinate signals read from the data store, whereby the picture information of the one image frame is combined with the picture information of the other image frame to appear in the appropriate position.
The invention further provides a system for enabling stored video images to be processed to reproduce image information from one image frame of a video signal so that it appears within another image frame of a video signal as if transposed onto a curved surface, comprising means for generating a first set of co-ordinate signals the values of which represent the co-ordinate positions of image information within a store containing the picture information of said one image frame, means for transforming the values of said first set of co-ordinate signals according to functions defining the desired curved surface in order to derive a second set of co-ordinate signals the values of which represent the co-ordinate positions within said other image frame at which the said curved surface will appear, a data store, means for addressing said data store with said second set of co-ordinate signals, means for writing into said data store the values of said first set of co-ordinate signals whereby at each co-ordinate address of the store defined by values of said second set of signals there are stored the corresponding values of the first set of signals, and means for addressing said data store with a third set of co-ordinate signals the values of which correspond to the co-ordinate positions of picture information to appear in said other image frame, to derive corresponding values of said first set of co-ordinate signals from the data store for addressing said store containing the picture information to be processed.
In accordance with the invention, the said data store therefore acts as an intermediate address store in which are stored, in "curved order" not the picture information to be reproduced upon the curved surface, but values defining the co-ordinate positions of such information within an original frame store. Since this inter
REFERENCES:
patent: 4667236 (1987-05-01), Dresdner
patent: 4875097 (1989-10-01), Jackson
patent: 4922345 (1990-05-01), Barton et al.
Barton Nicholas
Billing Robert
Burgess Glenton B.
Groody James J.
Questech Limited
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