Video coding/decoding arrangement and method therefor
First Claim
1. 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;
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 as a function of 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.
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Accused Products
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 spatial 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.
175 Citations
8 Claims
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1. A method of coding and decoding video images for transmission from a first station to a second station, the method comprising:
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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;
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 as a function of 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. - View Dependent Claims (2, 3, 4, 5, 6)
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7. An arrangement for coding and decoding video images for transmission from a first station to a second station, the method comprising:
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memories for storing 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;
an encoder responsive to video images provided at the first station and arranged to generate encoded video images;
means for determining motion parameters, including a frame selection parameter and a spatial displacement parameter, for the video images as a function of at least one of;
a distortion criteria and a data transmission rate; and
means, responsive to the encoded video images and the motion parameters, for predicting a new video image for display at the second station as function of the motion parameters and a group of the N frames. - View Dependent Claims (8)
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Specification