US 6,205,177 B1 · Video coder/decoder

Abstract

Coding and decoding of video images includes the use of multiple reference pictures and determining motion vector and time delay information for the video images. Video images are quantized and transmitted with the motion vector and time delay information from a first station to a second station. A new video image is predicted for display at the second station as function of the motion parameter codes and multiple reference pictures. The invention may be used in connection with a video communication and/or video conferencing system as a long-term memory predictor to improve image-coding efficiencies and motion compensation. The long-term memory prediction extends the spacial displacement utilized in block-based hybrid video coding by a variable time delay. The arrangement and method employ a proposed bit allocation scheme to provide increased coding efficiencies of the video coder. Applications include video reproduction of repetitive sequences, such as when the video camera is shaking or an image portion is repetitively moving between previously-displayed positions.

Claims22

Dependent claims

A method of coding and decoding video images for transmission from a first station to a second station, the method comprising:

providing respective sets of multiple reference pictures at the first and second stations to permit use of up to frames N for prediction, where N is a positive integer that is greater than one;
encoding the video images at the first station;
at the first station, determining motion parameters, including a frame selection parameter and a spatial displacement parameter, for the video images based on at least one of:
a distortion criteria and a data transmission rate;
transmitting the encoded video images and the motion parameters to the second station;
and
predicting a new video image for display at the second station as function of the motion parameters and a group of the N frames.

4 more elements

An arrangement of coding and decoding video images for transmission from a first station to a second station, the method comprising:

respective sets of multiple reference pictures adapted to be accessed at the first and second stations to permit use of up to frames N for prediction, where N is a positive integer that is greater than one;
a computer configured and arranged to encode the video images at the first station;
at the first station, a programmed computing arrangement adapted to determine motion parameters, including a frame selection parameter and a spatial displacement parameter, for the video images based on at least one of a distortion criteria and a data transmission rate, and further adapted to transmit the encoded video images and the motion parameters to the second station;
and
at the second station, a programmed computing arrangement adapted to predict a new video image for display at the second station as a function of the motion parameters and a group of the N frames.

2 more elements

Dependencies are inferred from the claim text.

Video coder/decoder

Life of this patent

Video coder/decoder

Life of this patent

Abstract

Claims22