EP0395267A2
Expired / Lapsed
EP
⏱️ 0.0 years remaining
Motion dependent video signal processing
Assignee: Sony Corp
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Filing: 1990-04-11
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Granted: —
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Expires: 2010-04-11
Abstract
Abstract In, for example, a motion compensated video standards converter wherein blocks in a first field or frame of a video signal are each compared with a plurality of blocks in the following succeeding field or frame of the video signal for deriving motion vectors representing the motion of the content of respective blocks between the first field or frame and the following field or frame, and wherein a respective correlation surface is generated for blocks in the first field or frame, the correlation surface representing the difference between the content of the block in the first field or frame and the content of each block in the following field or frame with which it has been compared, the shape of that part of the correlation surface which represents differences less than a threshold level is determined (21, 28, 33, 37, 38), and the comparison is varied in dependence on the shape.
Inventors
- 👤 Richard Joseph Andrew Avis
- 👤 Clive Henry Gillard
- 👤 Raphael Samad
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-09 20:35
CPC Classifications
H; H04; H04N; H04N7/00; H04N7/01; H04N7/0135; H04N7/014; G; G06; G06T; G06T7/00; G06T7/20; G06T7/223; G06T7/231; H04N7/0125; G06T2207/00; G06T2207/10; G06T2207/10016
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
161 words
A motion compensated video standards converter comprising: means (3, 4) for comparing blocks in a first field or frame of a video signal with a plurality of blocks in the following field or frame of the video signal for deriving motion vectors representing the motion of the content of respective said blocks between said first field or frame and said following field or frame, by generating a respective correlation surface for blocks in said first field or frame, said correlation surface representing the difference between the content of the said block in said first field or frame and the content of each block in said following field or frame with which it has been compared; means (21, 28, 33, 37, 38) to determine the shape of that part of said correlation surface which represents differences less than a threshold level and to vary said comparison in dependence on said shape; and an interpolator (8) controlled in dependence on said motion vectors.
Claim 2
Dependent Claim
161 words
A motion compensated video standards converter comprising: means (3, 4) for comparing blocks in a first field or frame of a video signal with a plurality of blocks in the following field or frame of the video signal for deriving motion vectors representing the motion of the content of respective said blocks between said first field or frame and said following field or frame, by generating a respective correlation surface for blocks in said first field or frame, said correlation surface representing the difference between the content of the said block in said first field or frame and the content of each block in said following field or frame with which it has been compared; means (21, 28, 33, 37, 38) to determine the shape of that part of said correlation surface which represents differences less than a threshold level and to vary said comparison in dependence on said shape; and an interpolator (8) controlled in dependence on said motion vectors.
Claim 3
Dependent Claim
52 words
A converter according to claim 1 wherein said correlation surface is tested to determine whether it indicates a clear minimum in said differences, and said means (21, 28, 33, 37, 38) to determine the shape is inhibited from operation unless said correlation surface does not indicate a clear minimum in said differences.
Claim 4
Dependent Claim
21 words
A converter according to claim 1 or claim 2 wherein said comparison is varied by increasing the size of said blocks.
Claim 5
Dependent Claim
126 words
A converter according to claim 1 or claim 2 wherein said means (21, 28, 33, 37, 38) to determine the shape determines the maximum dimensions of said shape in x and y directions relative to the picture represented by the video signal, and said comparison is varied by causing the size of said blocks to increase in the x direction if the dimension of said shape in the x direction is larger than that in the y direction, to increase in the y direction if the dimension of said shape in the y direction is larger than that in the x direction, and to increase in the x and y directions if the dimensions of said shape in the x and y directions are substantially equal.
Claim 6
Dependent Claim
34 words
A converter according to any one of the preceding claims wherein said comparison is effected by comparing the sums of the luminance levels of the pixels in the respective said blocks to be compared.
Claim 7
Independent Claim
155 words
A method of deriving motion vectors representing motion between successive fields or frames of a video signal, the method including the steps of: comparing blocks in a first field or frame of the video signal with a plurality of blocks in the following field or frame of the video signal for deriving said motion vectors representing the motion of the content of respective said blocks between said first field or frame and said following field or frame, by generating a respective correlation surface for blocks in said first field or frame, said correlation surface representing the difference between the content of the said block in said first field or frame and the content of each block in said following field or frame with which it has been compared; determining the shape of that part of said correlation surface which represents differences less than a threshold level; and varying said comparison in dependence on said shape.
Claim 8
Independent Claim
155 words
A method of deriving motion vectors representing motion between successive fields or frames of a video signal, the method including the steps of: comparing blocks in a first field or frame of the video signal with a plurality of blocks in the following field or frame of the video signal for deriving said motion vectors representing the motion of the content of respective said blocks between said first field or frame and said following field or frame, by generating a respective correlation surface for blocks in said first field or frame, said correlation surface representing the difference between the content of the said block in said first field or frame and the content of each block in said following field or frame with which it has been compared; determining the shape of that part of said correlation surface which represents differences less than a threshold level; and varying said comparison in dependence on said shape.
Claim 9
Dependent Claim
18 words
A method according to claim 6 wherein said comparison is varied by increasing the size of said blocks.
Claim 10
Dependent Claim
115 words
A method according to claim 6 wherein said determining step determines the maximum dimensions of said shape in x and y directions relative to the picture represented by the video signal, and said comparison is varied by causing the size of said blocks to increase in the x direction if the dimension of said shape in the x direction is larger than that in the y direction, to increase in the y direction if the dimension of said shape in the y direction is larger than that in the x direction, and to increase in the x and y directions if the dimensions of said shape in the x and y directions are substantially equal.
Claim 11
Dependent Claim
35 words
A method according to claim 6, claim 7 or claim 8 wherein said comparison is effected by comparing the sums of the luminance levels of the pixels in the respective said blocks to be compared.
References Cited (Backward Citations)
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