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US 6,295,377 B1Granted
Combined spline and block based motion estimation for coding a sequence of video images
AssigneeCompaq Computer Corporation
InventorsFrederic Dufaux, Sing Bing Kang
Life of this patent
Estimating the term…
Abstract
In an coder for producing a bitstream representative of a sequence of video images, a previous image is registered with a current image using spline-based registration to produce estimated motion vectors. The estimated motion vectors are used to match blocks of the previous image and the current image to produce translation vectors. The translation vectors compensate for motion while encoding the sequence as a bitstream.
Claims8
A method for estimating motion in a sequence of images, comprising the steps of;
- registering a previous image with a current image using 2-D splines created by a gradient technique based on pixel intensity to estimate the displacement of grid nodes and to produce estimated motion vectors;
- and
- matching blocks of the previous image and the current image using the estimated motion vectors to establish a search starting point and to reduce a search area to produce translation vectors.
An apparatus for estimating motion in a sequence, of images, comprises:
- means for registering a previous image with a current image using 2-D splines created by a gradient technique based on pixel intensity to estimate the displacement or grid nodes and to produce estimated motion vectors;
- and
- means for matching blocks of the previous image and the current image using the estimated motion vectors to establish a search starting point and to reduce a search area to produce translation vectors.
Dependencies are inferred from the claim text.