Encoding and decoding with refinement of the reconstructed picture
AssigneeInterDigital VC Holdings, Inc.
InventorsEdouard Francois, Christophe Chevance, Franck Hiron
Life of this patent
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Abstract
An encoding method for a picture part encoded in a bitstream and reconstructed can involve refinement data encoded in the bitstream and determined based on at least one comparison of a version of a rate distortion cost computed using a data coding cost, a distortion between an original version of the picture part and a reconstructed picture part, and at least one other version involving one or more combinations of with or without a refinement by the refinement data, or a refinement either in or out of the decoding loop, or with or without a mapping or an inverse mapping.
Claims18
A method for encoding video data based on a prediction loop based encoding process comprising:
- applying a mapping to a picture part using a mapping function to obtain a mapped picture part;
- encoding the mapped picture part based on a reference picture to provide an encoded picture part;
- reconstructing and in-loop filtering in the prediction loop the encoded picture part to provide a filtered reconstructed picture part;
- applying an inverse of the mapping function to the filtered reconstructed picture part to obtain an inverse mapped filtered reconstructed picture part;
- determining a refinement based on the inverse mapped filtered reconstructed picture part;
- encoding data representing the refinement in the form of parameters representative of a piece wise linear model to provide encoded refinement data;
- and
- providing video data including the encoded picture part and the encoded refinement data.
An apparatus comprising:
- one or more processors configured to encode video data based on a prediction loop based encoding process comprising:
- applying a mapping to a picture part using a mapping function to obtain a mapped picture part;
- encoding the mapped picture part based on a reference picture to provide an encoded picture part;
- reconstructing and in-loop filtering in the prediction loop the encoded picture part to provide a filtered reconstructed picture part;
- applying an inverse of the mapping function to the filtered reconstructed picture part to obtain an inverse mapped filtered reconstructed picture part;
- determining a refinement based on the inverse mapped filtered reconstructed picture part;
- encoding data representing the refinement in the form of parameters representative of a piece wise linear model to provide encoded refinement data;
- and
- providing video data including the encoded picture part and the encoded refinement data.
A method for decoding video data based on a prediction loop based decoding process comprising:
- decoding video data to obtain a picture part and refinement data in the form of parameters representative of a piece wise linear model;
- in-loop filtering the picture part in the prediction loop to provide a filtered picture part;
- applying an inverse mapping using an inverse mapping function to the filtered picture part to obtain an inverse mapped filtered picture part;
- determining a refinement based on the inverse mapped filtered picture part and on the refinement data;
- applying the refinement to the filtered picture part to provide a refined picture part;
- and
- applying the inverse mapping to the refined picture part.
An apparatus comprising:
- one or more processors configured to decode video data based on a prediction loop based decoding process comprising:
- decoding video data to obtain a picture part and refinement data in the form of parameters representative of a piece wise linear model;
- in-loop filtering the picture part in the prediction loop to provide a filtered picture part;
- applying an inverse mapping using an inverse mapping function to the filtered picture part to obtain an inverse mapped filtered picture part;
- determining a refinement based on the inverse mapped filtered picture part and on the refinement data;
- applying the refinement to the filtered picture part to provide a refined picture part;
- and
- applying the inverse mapping to the refined picture part.
Dependencies are inferred from the claim text.