Pulse or digital communications – Bandwidth reduction or expansion – Television or motion video signal
Reexamination Certificate
2005-10-11
2005-10-11
Kelley, Chris (Department: 2613)
Pulse or digital communications
Bandwidth reduction or expansion
Television or motion video signal
C375S240120, C375S240240
Reexamination Certificate
active
06954500
ABSTRACT:
The invention relates to the field of two-dimensional sub-band coding techniques, extended to video data by including the temporal domain within the decomposition: in order to deal with objects having large displacements, motion estimation and compensation are added, which may however result in considerable information overhead to the detriment of texture. For a good trade-off between the need of a true motion field and the size of the resulting motion information to be encoded, the invention relates to a method allowing to keep the amount of motion vector information reasonably low and to allocate more bits to texture in non-moving areas. Said method first performs a preliminary analysis which allows to identify parts of the image not requiring a precise description of the motion information, followed by a motion estimation on the basis of this preliminary information. A decision based on the energy of the high frequency temporally filtered subbands is then taken, before the final motion compensation operation, in view of the selection of the most appropriate motion vector.
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“Three-Dimensional Subband Coding of Video”, by C.I. Podilchuk et al., IEEE Transactions on Image Processing, vol. 4, pp. 125-139, Feb. 1995.
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Kelley Chris
Koninklijke Philips Electronics , N.V.
Rekstad Erick
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