EP0268360A2
Expired / Lapsed
EP
⏱️ 0.0 years remaining
System for processing video image signals
Assignee: Questech Ltd
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Filing: 1987-09-21
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Granted: —
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Expires: 2007-09-21
Abstract
Abstract A video image processing system for generating so-called "multi-freeze" digital video effects comprises a frame store (14) within which an image signal can be stored for application to a combining circuit (4) together with a background image signal (1) providing a background against which a trail of frozen images is to be displayed. The trail of images is derived by recycling images stored in the memory (14) through a further combining circuit (19) wherein the stored image is combined with incoming image signals applied to both combining means (4,19). Decay and patterning of the frozen images can be effected by circuits (24,25) for attenuating and profiling the key signals accompanying the image signals.
Inventors
- 👤 Nicholas Barton
- 👤 Paul Kevin Burgess
- 👤 Robert Billing
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-10-29 10:55
CPC Classifications
H; H04; H04N; H04N5/00; H04N5/222; H04N5/262; H04N5/2625
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
182 words
A video image processing system characterised in that it comprises means for receiving a first video signal from a signal source intended to provide a background or background image, means for receiving a second video signal from a signal source intended to define a moving image to be depicted against the background provided by the first signal in conjunction with a key signal defining the image area to be occupied by said moving image in each frame of the video image, means for storing information derived from the said second signal and the associated key signal in each field period of the second signal, means for processing said second signal and said key signal prior to storage of said information therefrom in order to combine said information with information correspondingly stored during a previous field period, and further processing means arranged to provide a composite video output signal by combining said first and second signals and the processed and stored second signal and to provide a composite key signal by combining the incoming key signal with the processed and stored key signal.
Claim 2
Dependent Claim
182 words
A video image processing system characterised in that it comprises means for receiving a first video signal from a signal source intended to provide a background or background image, means for receiving a second video signal from a signal source intended to define a moving image to be depicted against the background provided by the first signal in conjunction with a key signal defining the image area to be occupied by said moving image in each frame of the video image, means for storing information derived from the said second signal and the associated key signal in each field period of the second signal, means for processing said second signal and said key signal prior to storage of said information therefrom in order to combine said information with information correspondingly stored during a previous field period, and further processing means arranged to provide a composite video output signal by combining said first and second signals and the processed and stored second signal and to provide a composite key signal by combining the incoming key signal with the processed and stored key signal.
Claim 3
Dependent Claim
36 words
A video image processing system as claimed in claim 1, characterised in that the said first processing means is associated with further means for reducing the value of the processed key signal prior to storage thereof.
Claim 4
Dependent Claim
28 words
A video image processing system as claimed in claim 2, characterised in that said further means is controllable to enable variable attenuation of the said processed key signal.
Claim 5
Dependent Claim
52 words
A video image processing system as claimed in any one of claims 1 to 3, characterised in that a further processor is arranged to modify the processed and stored key signal before it is combined with the incoming key signal in order to introduce further effects into the image to be displayed.
Claim 6
Dependent Claim
30 words
A video image processing system as claimed in claim 4, characterised in that said further processor is arranged to introduce a pettern into the profile of the said key signal.
References Cited (Backward Citations)
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