Encoding/decoding method and apparatus for intra predicting a coding unit partition
Disclosed is an image decoding method using the correlation between color components to perform into prediction of chrominance components. Here, the image decoding method using the correlation between color components to perform intra prediction of chrominance components comprises the steps of: checking image data and a prediction mode in a bitstream; generating a prediction block according to a reconstructed prediction mode; determining compensation settings according to the size of a current block and the reconstructed prediction mode; compensating the prediction block according to the determined compensation settings; and reconstructing the current block by adding reconstructed image data to the prediction block.
1. An image decoding method performed by an image decoding apparatus, the image decoding method comprising:
determining reference samples for a current sample included in a current block, the reference samples being obtained from one or more neighboring blocks of the current block;
predicting the current sample based on the reference samples to generate a prediction sample for the current sample; and
correcting the prediction sample,
wherein at least one reference sample among the reference samples is determined based on position of the current sample,
wherein the current sample is predicted using interpolation of the reference samples,
wherein the one or more neighboring blocks is selected from a plurality of candidates including a left neighboring block, a top neighboring block and both of the left neighboring block and the top neighboring block based on a non-directional prediction mode of the current block,
wherein the reference samples obtained from both of the left neighboring block and the top neighboring block include a first reference sample located at (w−1,−1) and a second reference sample located at (−1, h−1) in case a top-left sample position of the current block is (0, 0), a width of the current block is w and a height of the current block is h, and
wherein the prediction sample for the current sample is corrected using a setting determined based on the non-directional prediction mode.
2. An image encoding method performed by an image encoding apparatus, the image encoding method comprising:
determining reference samples for a current sample included in a current block, the reference samples being obtained from one or more neighboring blocks of the current block;
predicting the current sample based on the reference samples to generate a prediction sample for the current sample; and
correcting the prediction sample,
wherein at least one reference sample among the reference samples is determined based on position of the current sample,
wherein the current sample is predicted using interpolation of the reference samples,
wherein the one or more neighboring blocks is selected from a plurality of candidates including a left neighboring block, a top neighboring block and both of the left neighboring block and the top neighboring block based on a non-directional prediction mode of the current block,
wherein the reference samples selected from both of the left neighboring block and the top neighboring block include a first reference sample located at (w−1,−1) and a second reference sample located at (−1, h−1) in case a top-left sample position of the current block is (0, 0), a width of the current block is w and a height of the current block is h, and
wherein the prediction sample for the current sample is corrected using a setting determined based on the non-directional prediction mode.
3. A method of generating a bitstream and transmitting the bitstream, the method comprising:
determining reference samples for a current sample included in a current block, the reference samples being obtained from one or more neighboring blocks of the current block;
predicting the current sample based on the reference samples to generate a prediction sample for the current sample;
correcting the prediction samples;
generating the bitstream based on the corrected prediction samples; and
transmitting the bitstream,
wherein at least one reference sample among the reference samples is determined based on position of the current sample,
wherein the current sample is predicted using interpolation of the reference samples,
wherein the one or more neighboring blocks is selected from a plurality of candidates including a left neighboring block, a top neighboring block and both of the left neighboring block and the top neighboring block based on a non-directional prediction mode of the current block,
wherein the reference samples selected from both of the left neighboring block and the top neighboring block include a first reference sample located at (w−1, 1) and a second reference sample located at (−1, h−1) in case a top-left sample position of the current block is (0, 0), a width of the current block is w and a height of the current block is h, and
wherein the prediction sample for the current sample is corrected using a setting determined based on the non-directional prediction mode.