Patent EP0437002A2 successfully refreshed from Google Patents.
EP0437002A2
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EP
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Region and texture coding
Assignee: Philips Electronics UK Ltd
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Filing: 1990-12-28
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Granted: —
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Expires: 2010-12-28
Abstract
Abstract A luminance signal (Y) is applied to a segmentation device (2) and subjects the signal to a segmentation algorithm to produce a region image signal which is encoded in a region image encoder (3). The region image signal is also applied to a region post-processor (4) in which an adapted smooth function is added to the region signal. The resulting modified region image signal is subtracted in subtractor (5) from the luminance signal to produce a texture signal which is encoded by a texture image encoder (6). The encoded signals are conveyed via a data channel (9) to respective region (12) and texture (14) image decoders and the recovered region image signal post-processed in a processor (13) in the same manner as with processor (4). The resulting modified region image signal and the recovered texture image signal are added in an adder (15) to produce a reconstructed luminance signal.
Inventors
- 👤 David Moran
- 👤 Octavius John Morris
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-04 23:07
CPC Classifications
G; G06; G06T; G06T9/00; G06T9/20; H; H04; H04N; H04N19/00; H04N19/20
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
140 words
A method of processing a picture signal for conveyance by means of a transmission path or storage medium, said method comprising the steps of:- i) producing a picture signal which corresponds to a picture, ii) subjecting said picture signal to a segmentation algorithm to produce a region signal which identifies edges and closed regions in said picture, iii) producing a modified region signal by post-processing the region signal produced in step (ii), and iv) producing a texture signal which corresponds to the difference between the picture signal produced in step (i) and the modified region signal produced in step (iii). characterised in that the production of said modified region signal comprises the steps of:- v) producing an appropriate smooth function which is adapted to said region signal, and vi) adding the function produced in step (v) to said region signal.
Claim 2
Independent Claim
146 words
A method of recovering a picture signal received in the form of a first component related to the regions of said picture signal and a second component related to the texture of said picture signal, said method comprising the steps of:- i) receiving said region related component and producing a region signal therefrom, ii) receiving said texture related component and producing a texture signal therefrom, iii) producing a modified region signal by post-processing the region signal recovered in step (i), and iv) producing a recovered picture signal by combining said modified region signal produced in step (iii) and said recovered texture signal produced in step (ii), characterised in that the production of said modified region signal comprises the steps of:- v) producing an appropriate smooth function which is adapted to said region signal, and vi) adding the function produced in step (v) to said region signal.
Claim 3
Dependent Claim
27 words
A method as claimed in Claim 1 or 2, characterised in that the gradient of said function is dependent on the step edge size between adjacent regions.
Claim 4
Dependent Claim
64 words
A method as claimed in Claim 3, characterised in that the said smooth function is a polynomial providing the approximation f(x) = ax³ + bx² + cx + d where a, b, c and d are coefficients chosen to provide a spline function f(x) which is adapted to the properties of the region signal and x is the distance from its asociated step edge.
Claim 5
Dependent Claim
27 words
A method as claimed in Claim 1, 2, 3 or 4, characterised in that the gradient of said function is dependent upon the width of a region.
Claim 6
Dependent Claim
125 words
Apparatus for processing a picture signal for conveyance by means of a transmission path or storage medium, said apparatus comprising means for producing a picture signal which corresponds to a picture, means for subjecting said picture signal to a segmentation algorithm to produce a region signal which identifies edges and closed regions in said picture, means for producing a modified region signal by post-processing the region signal, and means for producing a texture signal which corresponds to the difference between the picture signal and the said modified region signal, characterised in that said means for producing said modified region signal comprises means for producing an appropriate smooth function which is adapted to said region signal and means for adding said function to said region signal.
Claim 7
Dependent Claim
130 words
Apparatus for recovering a picture signal received in the form of a first component related to the regions of said picture signal and a second component related to the texture of said picture signal, said apparatus comprising means for receiving said region related component and producing a region signal therefrom, means for receiving said texture related component and producing a texture signal therefrom, means for producing a modified region signal by post-processing the region signal, and means for producing a recovered picture signal by combining said modified region signal and said recovered texture signal, characterised in that said means for producing said modified region signal comprises means for producing an appropriate smooth function which is adapted to said region signal and means for adding said function to said region signal.
Claim 8
Dependent Claim
32 words
Apparatus as claimed in Claim 6 or 7, characterised in that the gradient of said function produced by said function producing means is dependent on the step edge size between adjacent regions.
Claim 9
Dependent Claim
69 words
Apparatus as claimed in Claim 8, characterised in that the said smooth function produced by said function producing means is a polynomial providing the approximation f(x) = ax³ + bx² + cx + d where a, b, c and d are coefficients chosen to provide a spline function f(x) which is adapted to the properties of the region signal and x is the distance from its asociated step edge.
Claim 10
Dependent Claim
32 words
Apparatus as claimed in Claim 6, 7, 8 or 9, characterised in that the gradient of said function produced by said function producing means is dependent upon the width of a region.
References Cited (Backward Citations)
No citation records indexed.
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