Picture coding apparatus and method thereof
AssigneeSony Corporation
InventorsTetsujiro Kondo, Yasuhiro Fujimori, Kunio Kawaguchi
Life of this patent
Estimating the term…
Abstract
In a picture coding apparatus and a picture coding method, when a picture data is hierarchically coded, compression efficiency can be improved, and the deterioration of picture quality can be reduced. When a picture data is hierarchically coded by utilizing a recursive hierarchical representation, adaptive division of block is performed corresponding to the characteristic of the picture data and then coding is performed, and thus obtained hierarchical coded data is transmitted, so that the block of the lower hierarchy can be adaptively divided, thereby the information quantity such as a plane portion of picture can be reduced.
Claims51
A hierarchical picture coding apparatus for coding a plurality of hierarchical data having a plurality of different resolutions, comprising:
- a circuit for generating a plurality of hierarchical data having a plurality of different resolutions;
- a circuit for detecting an activity of a predetermined block of each hierarchical data, controlling a division of a block corresponding to said predetermined block based on said activity, and generating a flag showing said control of the division;
- a circuit for determining a threshold value, which is a determination standard of said activity, in order to control the amount of generation information to a target value;
- and
- a circuit for coding said each hierarchical data;
- wherein said division controlling circuit controls the division of a block corresponding to said predetermined block by comparing said activity with said threshold value.
A hierarchical picture coding method for coding a plurality of hierarchical data having a plurality of different resolutions, said method comprising the steps of:
- generating a plurality of hierarchical data having a plurality of different resolutions;
- detecting an activity of a predetermined block of each hierarchical data, controlling a division of a block corresponding to said predetermined block based on said activity, and generating a flag showing said control of the division;
- determining a threshold value, which is a determination standard of said activity, in order to control the amount of generation information to a target value;
- and
- coding said each hierarchical data;
- wherein the division controlling step controls the division of a block corresponding to said predetermined block by comparing said activity with said threshold value.
A hierarchical picture coding method for coding a plurality of hierarchical data having a plurality of different resolutions, and transmitting the coded data, comprising the steps of:
- generating a plurality of hierarchical data having a plurality of different resolutions;
- detecting an activity of a predetermined block of each hierarchical data, controlling a division of a block corresponding to said predetermined block based on said activity, and generating a flag showing said control of the division;
- determining a threshold value, which is a determination standard of said activity, in order to control the amount of generation information to a target value;
- coding said each hierarchical data so as to generate a coded data;
- and
- transmitting said coded data;
- wherein said division controlling step controls the division of a block corresponding to said predetermined block by comparing said activity with said threshold value;
- and
- wherein said transmitting step transmits said coded data along with said flag.
Dependencies are inferred from the claim text.