Methods and apparatuses for encoding and decoding image using adaptive filtering
AssigneeSamsung Electronics Co., Ltd.
InventorsByeong-doo CHOI, Dae-sung CHO, Seung-soo JEONG
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Abstract
Provided are methods and apparatuses for encoding and decoding an image by using adaptive filtering. The method of encoding an image by using adaptive filtering includes: determining a filter to be applied to a reference frame used for prediction encoding of a current block to be encoded, by adaptively changing a size and filter coefficients of the filter; filtering the reference frame by using the determined filter; prediction encoding the current block by using the filtered reference frame; and outputting data of the prediction encoded current block and information about the filter.
Claims22
A method of encoding an image by using adaptive filtering, the method comprising:
- determining a filter by adaptively changing a size and filter coefficients of the filter, the filter to be applied to a reference frame used for prediction encoding of a current block to be encoded;
- filtering the reference frame by using the determined filter;
- prediction encoding the current block by using the filtered reference frame;
- and
- outputting the prediction encoded current block and information about the filter.
A method of decoding an image by using adaptive filtering, the method comprising:
- extracting, by parsing a received bitstream, data of a differential signal between a current block to be decoded and a corresponding block of a reference frame, and information about a filter applied to the reference frame;
- determining a filter to be applied to the reference frame by adaptively changing a size and filter coefficients of the filter based on the extracted information about the filter;
- filtering the reference frame by using the determined filter;
- generating a prediction signal of the current block by using the filtered reference frame;
- and
- restoring the current block by adding the differential signal and the prediction signal of the current block.
An apparatus for encoding an image by using adaptive filtering, the apparatus comprising:
- a filtering unit which determines a filter to be applied to a reference frame by adaptively changing a size and filter coefficients of the filter and filtering the reference frame by using the determined filter, the reference frame used for prediction encoding of a current block to be encoded;
- a prediction encoder which prediction encodes the current block by using the filtered reference frame;
- and
- an output unit which outputs the prediction encoded data of the current block and information about the filter.
An apparatus for decoding an image by using adaptive filtering, the apparatus comprising:
- a data extractor which extracts, by parsing a received bitstream, data of a differential signal between a current block to be decoded and a corresponding block of a reference frame, and information about a filter applied to the reference frame;
- a filtering unit which determines a filter to be applied to the reference frame by adaptively changing a size and filter coefficients of the filter based on the extracted information about the filter, and filtering the reference frame by using the determined filter;
- a predictor which generates a prediction signal of the current block by using the filtered reference frame;
- and
- a restoring unit which restores the current block by adding the differential signal and the prediction signal of the current block.
Dependencies are inferred from the claim text.