A transform coder adaptively configures window sizes for transform coding in a two-pass
process to maximize coding efficiency, while achieving necessary time resolution to avoid …

BACKGROUND In the era of multimedia communications, many technical challenges are
incurred in the processing of digital video, due to its large amount of data involved and …

A set of one and two-dimensional transforms is constructed subject to certain range limited
constraints to provide a computationally efficient transform implementation, such as for use …

A transform coder is described that performs a time-split transform in addition to a discrete
cosine type transform. A time-split transform is selectively performed based on …

Some embodiments provide a method for encoding a first set of pixels in a first image by
reference to a second image in a video sequence. In a first search window within a second …

(57) ABSTRACT A video encoder and corresponding method are provided for encoding
video signal data for animage blockanda particular reference picture index to predict the …

US PATENT DOCUMENTS at low bit rates. The encoder/decoder determines a band struc
ture for spectral holes based on two threshold parameters: a 5,040,217 A 8/1991 …

Motion vectors for encoding a predicted frame relative to a reference frame are determined
from a phase correlation of corresponding regions of the predicted frame and reference …

The detailed description presents innovations in performing motion estimation during digital
video media encoding. In one example embodiment, motion estimation is performed using a …

US PATENT DOCUMENTS 6,014, 181 A 1/2000 Sun 6,081,209 A 6/2000 Schuyler et al.
6,128,047 A 10/2000 Chang et al. 6, 192,081 B1 2/2001 Chiang et al. 6.212, 237 B1 4/2001 …