Title:
MOTION COMPENSATION OF IMAGES
Document Type and Number:
WIPO Patent Application WO2002037420
Kind Code:
A3
Abstract:
Motion compensation of a sequence of image fields (0-5) is carried out in the frequency domain using phase correlation (10) between corresponding picture areas of a pair of time-spaced, input fields (1, 4) to produce a set of motion-vector estimates that are used for filtering the relevant areas of each field (1; 4) of the pair by interpolation (11; 12) with the corresponding area of its preceding and following input-fields (0, 2; 3, 5) of the sequence, to produce a frame-approximation to that field (1; 4) through combination of the individually-filtered areas. The filtering in each case involves respective application (24-26 of weighting coefficients to corresponding spatial-frequency components of the relevant picture areas of three fields, and summation (28) of the weighted components, the coefficients being calculated or selected (27) according to the motion-vector estimate associated with each picture area. Repetition of the phase-correlation step (13) using the frame-approximations refines each motion-vector estimate for repeating the three-field interpolation processes (14, 15) to derive better frame-approximations. Transformation from the frequency to special domain (34) takes place after two or more reiterations, or when convergence is reached for all constituent picture areas.
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Application Number:
PCT/GB2001/004894
Publication Date:
August 01, 2002
Filing Date:
November 05, 2001
Export Citation:
Assignee:
CLAYTON JOHN CHRISTOPHER (GB)
International Classes:
H04N7/01; G06T7/20; H03M7/36; H04N5/14; H04N9/64; H04N5/44; H04N9/78; (IPC1-7): H04N5/21; H04N5/14
Foreign References:
| EP0649250A2 | 1995-04-19 | |||
| US4442454A | 1984-04-10 |
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