Competitive Technologies of Pa, Inc.

Hangqiao Sun

Weiping Li

Shipeng Li

A method of encoding and decoding an image includes the following steps: subsampling the image to obtain a plural number of subsampled frames of spatially offset image-representative signals; transforming each of the subsampled frames to obtain a corresponding number of frames of transform coefficient-representative signals; forming vector-representative signals from corresponding coefficient-representative signals of the respective frames of coefficient-representative signals; transforming the vector-representative signals; quantizing the transformed vector-representative signals to obtain encoded signals; transmitting the encoded signals; receiving the transmitted encoded signals; and decoding the encoded signals to obtain a recovered version of the image.

Method and apparatus for encoding and decoding images

A method for decoding an encoded signal that includes an encoded control portion and an encoded video portion, includes the following steps: providing a plurality of inverse transform functions; decoding the encoded signal to recover the control portion; selecting one of the inverse transform functions in accordance with the recovered control portion; and decoding encoded video portion with the selected inverse transform function.

A method is disclosed for adaptive entropy coding and decoding of a stream of indices representative of information, including the following steps: establishing, at both an encoder and a decoder, respective coding tables to have codes corresponding to indices; finding, in the encoder table, codes corresponding to indices of the stream of indices, and sending the found codes to the decoder for recovery of the indices corresponding to the sent codes; determining an overall frequency of occurrence of individual indices in the stream of indices; determining a measure of how currently individual indices have occurred in the stream of indices; and adaptively modifying the encoder and decoder tables in accordance with the measure of how currently individual indices have occurred and the frequency of occurrence.

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Bethlehem, PA, United States of America

Hangqiao Sun