Video coding system
First Claim
1. An encoder for performing motion compensated encoding of a sequence of video frames comprising:
- memory means for storing a reference frame; and
motion field estimation means for estimating the motion of picture elements in a current frame using at least the reference frame, wherein the motion field estimation means uses prediction motion coefficients previously estimated for a least one picture element of the current frame in the estimation of motion coefficients for at least one other picture element of the current frame.
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Abstract
A motion estimation method and system for a video coder are disclosed. The system comprises an input for a video image to be coded. It also comprises a hierarchical series of motion estimators of varying complexity, for estimating a motion vector field between the received image and a reference image. The subsequent motion estimator in the series is selected by a control means if a prediction error associated with the motion vector field estimated by the currently selected motion estimator exceeds a predetermined threshold. When available, inherited and predicted motion information is used to improve prediction quality.
74 Citations
21 Claims
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1. An encoder for performing motion compensated encoding of a sequence of video frames comprising:
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memory means for storing a reference frame; and
motion field estimation means for estimating the motion of picture elements in a current frame using at least the reference frame, wherein the motion field estimation means uses prediction motion coefficients previously estimated for a least one picture element of the current frame in the estimation of motion coefficients for at least one other picture element of the current frame. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20)
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21. A method for performing motion compensated encoding of a sequence of video frames comprising the step of:
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storing a reference frame;
estimating the motion of picture elements in a current frame using at least the reference frame; and
using a set of prediction motion coefficients previously estimated for a least one picture element of the current frame in the estimation of a set of motion coefficients for at least one other picture element of the current frame
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Specification