EP0650293A2
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EP
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Conversion method of the frame frequency of a video signal from 50 Hz to 75 Hz with movement compensation and apparatus for implementing such method
Assignee: SELECO SpA
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Filing: 1994-10-23
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Granted: —
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Expires: 2014-10-23
Abstract
Abstract A method is described for the conversion of the frame frequency of a video signal of progressive scansion from 50 Hz to 75 Hz; the main characteristic of the method consists in the fact that a temporal redistribution of the original frames is provided and an interpolation of an additional frame every two originals. A second important characteristic of the described method consists in the fact that the interpolation provides a movement compensation; a movement vector is associated to every pixel of the frame to be interpolated; the values of the interpolated pixels are produced with an operation of average along the estimated path of movement.
Inventors
- 👤 Marino Balanza
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-09 19:27
CPC Classifications
H; H04; H04N; H04N7/00; H04N7/01; H04N7/0127; H04N7/0132; H04N7/0135; H04N7/014
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
43 words
Method for the conversion of the frame frequency of a video signal of progressive scansion from 50 Hz to 75 Hz, characterised in that a temporal redistribution of the original frames is provided and an interpolation of an additional frame every two originals.
Claim 2
Dependent Claim
94 words
Method for the conversion of the frame frequency of a video signal of progressive scansion from 50 Hz to 75 Hz, according to claim 1, characterised in that said temporal redistribution requires that one of the original frames (Fx) is shown 3,3 milliseconds before the instant occupied in the original sequence, that the other original frame (Fy) is shown 3,3 milliseconds after of the instant that it occupied in the original sequence, and that the additional frame (Fz) is interpolated in a central position between said two original frames displaced in a temporal manner.
Claim 3
Dependent Claim
73 words
Method for the conversion of the frame frequency of a video signal of progressive scansion from 50 Hz to 75 Hz, according to claim 1 or 2, characterised in that the interpolation provides a movement compensation, that a movement vector (V) is associated to each pixel of the frame to be interpolated and that the values of the interpolated pixel are produced with an operation of average along the estimated path of movement.
Claim 4
Dependent Claim
42 words
Method for the conversion of the frame frequency of a video signal of progressive scansion from 50 Hz to 75 Hz, according to claim 3, characterised in that for the interpolation the most probable local subgroup of the possible vectors is considered.
Claim 5
Dependent Claim
50 words
Method for the conversion of the frame frequency of a video signal of progressive scansion from 50 Hz to 75 Hz, according to claim 3, characterised in that a vectors field is generated for the interpolation that is made uniform by means of a median filtering of the vectorial components.
Claim 6
Dependent Claim
68 words
Method for the conversion of the frame frequency of a video signal of progressive scansion from 50 Hz to 75 Hz, according to one or more of the previous claims from 3 to 5, characterised in that when interpolating the pixel in position (x,y) the vector found for the previous pixel (x - 1,y) is utilised as reference and only the 9 vectors adjacent to it are examined.
Claim 7
Dependent Claim
59 words
Method for the conversion of the frame frequency of a video signal of progressive scansion from 50 Hz to 75 Hz, according to one or more of the previous claims from 3 to 5, characterised in that for the interpolation weighted correlation indexes (WCI) are utilized the parameter K of which is given a value between 0,05 and 2.
Claim 8
Dependent Claim
50 words
Method for the conversion of the frame frequency of a video signal of progressive scansion from 50 Hz to 75 Hz, according to one or more of the previous claims from 3 to 5, characterised in that as support window for the interpolation a quincunx of 8 pixel is considered.
Claim 9
Dependent Claim
95 words
Method for the conversion of the frame frequency of a video signal of progressive scansion from 50 Hz to 75 Hz, according to one or more of the previous claims from 3 to 5, characterised in that the management of the memories (M1, M2, M3, M4, M5) necessary for the two frames (Fx, Fy) to be recopied and for the frame (Fz) to be interpolated is carried out based on operations of the read-before-write type or of the write-before-read type in order to optimise the timing of the operations that take place in partial superimposition.
Claim 10
Dependent Claim
36 words
Apparatus for the implementation of the method for the conversion of the frame frequency of a video signal of progressive scansion from 50 Hz to 75 Hz according to one or more of the previous claims.
References Cited (Backward Citations)
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