Method and apparatus for dynamic loop and post filtering
AssigneeMatsushita Electric Industrial Co., Ltd.
InventorsThiow Keng Tan, Chee Yong Law
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Abstract
This invention teaches a mechanism or method for automatically and dynamically switching between a post filter and a loop filter for a video decoder. This dynamic operation is done automatically based on encoding parameters that are derived from information found in the bit stream being decoded by the video decoder. Based on these parameters, the decoder decides that the frame store should be filled with the unfiltered reconstructed picture or the filtered reconstructed picture. The decision is done on a picture by picture basis. Regardless of the decision, the output display picture is always filtered.
Claims22
A method of improving a picture quality in encoding of digitally compressed video, said method comprising the steps of:
- encoding a sequence of picture information into a coded representation and locally reconstructed pictures by one picture at every one time instance;
- filtering said locally reconstructed picture to obtain a locally filtered picture;
- selecting a local reference picture from a group consisting of said locally reconstructed picture and said locally filtered picture of a same time instance;
- and
- using said local reference picture in order to predict a motion compensation of a next picture in said encoding step.
A method of improving a picture quality in decoding of digitally compressed video, said method comprising the steps of:
- decoding a coded representation into a sequence of reconstructed pictures by one picture at every one time instance;
- filtering said reconstructed picture to obtain a filtered picture;
- selecting a reference picture from a group consisting of said reconstructed picture and said filtered picture of a same time instance;
- and
- using said reference picture in order to predict a motion compensation of a next picture in said decoding step.
A method of improving a picture quality of digitally compressed video, said method comprising the steps of:
- encoding a sequence of picture information into a coded representation by one picture at every one time instance;
- decoding said coded representation into a sequence of reconstructed pictures by one picture at every one time instance;
- filtering said reconstructed picture to obtain a filtered picture;
- selecting a reference picture from a group consisting of said reconstructed picture and said filtered picture of a same time instance;
- and
- using said reference picture in order to predict a motion compensation of a next picture in said decoding step.
A method of improving a picture quality in decoding of digitally compressed video, said method comprising the steps of:
- decoding a coded representation into a sequence of reconstructed pictures by one picture at every one time instance;
- filtering said reconstructed picture to obtain a filtered picture;
- selecting a display picture from a group consisting of said reconstructed picture and said filtered picture of a same time instance;
- sending said display picture to an output of a decoder;
- selecting a reference picture from a group consisting of said reconstructed picture and said filtered picture of a same time instance;
- and
- using said reference picture in order to predict a motion compensation of a next picture in said decoding step.
A method of improving a picture quality in decoding of digitally compressed video, said method comprising the steps of:
- decoding a coded representation into a sequence of reconstructed pictures by one picture at every one time instance;
- filtering said reconstructed picture to obtain a filtered picture;
- selecting a display picture from a group consisting of said reconstructed picture and said filtered picture of a same time instance;
- sending said display picture to an output of a decoder;
- selecting a reference picture from a group consisting of said reconstructed picture and said display picture of a same time instance;
- and
- using said reference picture in order to predict a motion compensation of a next picture in said decoding step.
An apparatus for improving a picture quality in encoding of digitally compressed video, said apparatus comprising:
- an encoding means for encoding a sequence of picture information into a coded representation and locally reconstructed pictures by one picture at every one time instance;
- a means for filtering said locally reconstructed picture to obtain a locally filtered picture;
- a means for selecting a local reference picture from a group consisting of said locally reconstructed picture and said locally filtered picture of a same time instance;
- and
- a means for using said local reference picture in order to predict a motion compensation of a next picture in said encoding means.
An apparatus for improving a picture quality in decoding of digitally compressed video, said apparatus comprising:
- a decoding means for decoding a coded representation into a sequence of reconstructed pictures by one picture at every one time instance;
- a means for filtering said reconstructed picture to obtain a filtered picture;
- a means for selecting a reference picture from a group consisting of said reconstructed picture and said filtered picture of a same time instance;
- and
- a means for using said reference picture in order to predict a motion compensation of a next picture in said decoding means.
An apparatus for improving a picture quality of digitally compressed video, said apparatus comprising:
- an encoding means for encoding a sequence of picture information into a coded representation by one picture at every one time instance;
- a decoding means for decoding said coded representation into a sequence of reconstructed pictures by one picture at every one time instance;
- a means for filtering said reconstructed picture to obtain a filtered picture;
- a means for selecting a reference picture from a group consisting of said reconstructed picture and said filtered picture of a same time instance;
- and
- a means for using said reference picture in order to predict a motion compensation of a next picture in said decoding means.
An apparatus for improving a picture quality in decoding of digitally compressed video, said apparatus comprising:
- a decoding means for decoding a coded representation into a sequence of reconstructed pictures by one picture at every one time instance;
- a means for filtering said reconstructed picture to obtain a filtered picture;
- a means for selecting a display picture from a group consisting of said reconstructed picture and said filtered picture of a same time instance;
- a means for sending said display picture to an output of a decoder;
- a means for selecting a reference picture from a group consisting of said reconstructed picture and said filtered picture of a same time instance;
- and
- a means for using said reference picture in order to predict a motion compensation of a next picture in said decoding means.
An apparatus for improving a picture quality in decoding of digitally compressed video, said apparatus comprising:
- a decoding means for decoding a coded representation into a sequence of reconstructed pictures by one picture at every one time instance;
- a means for filtering said reconstructed picture to obtain a filtered picture;
- a means for selecting a display picture from a group consisting of said reconstructed picture and said filtered picture of a same time instance;
- a means for sending said display picture to an output of a decoder;
- a means for selecting a reference picture from a group consisting of said reconstructed picture and said display picture of a same time instance;
- and
- a means for using said reference picture in order to predict a motion compensation of a next picture in said decoding means.
Dependencies are inferred from the claim text.