Method and apparatus for reconstructing 360-degree image according to projection format

A method of encoding an image with an encoding apparatus, comprising:

• determining whether to perform partitioning for a current block included in the image, the current block being partitioned into a plurality of sub-partitions when the partitioning being performed for the current block, the determination being encoded into encoding data for the current block;
• generating a prediction block of the current block included in the image, the prediction block being generated for each of the plurality of sub-partitions when the partitioning being performed for the current block;
• obtaining a residual block based on the prediction block, the residual block being obtained for each of the plurality of sub-partitions when the partitioning being performed for the current block;
• encoding residual coefficients of the residual block;
• including syntax elements for the residual coefficients into encoding data for the current block;
• and
• encoding post processing information into the encoding data,
• wherein the residual coefficients are encoded by performing transformation,
• wherein the post processing information is used for performing a post processing on a reconstructed image, the reconstructed image being an image obtained based on the residual block of the current block, and
• wherein the post processing comprises padding at least one region to the reconstructed image,
• wherein the padding is performed by
• determining at least one equation defined as a function of a width of the image or a height of the image,
• determining a sample inside the reconstructed image based on the equation, and
• using the sample inside the reconstructed image for padding the region, and
• wherein the padding is performed by
• partitioning the reconstructed image into a plurality of partitioning units;
• and
• performing the padding for the each partitioning unit.

A method of transmitting a bitstream, the method comprises:

• determining whether to perform partitioning for a current block included in the image, the current block being partitioned into a plurality of sub-partitions when the partitioning being performed for the current block, the determination being encoded into encoding data for the current block;
• generating a prediction block of the current block included in the image, the prediction block being generated for each of the plurality of sub-partitions when the partitioning being performed for the current block;
• obtaining a residual block based on the prediction block, the residual block being obtained for each of the plurality of sub-partitions when the partitioning being performed for the current block;
• encoding residual coefficients of the residual block;
• including syntax elements for the residual coefficients into encoding data for the current block;
• encoding post processing information into the encoding data;
• and
• transmitting the bitstream including the encoding data,
• wherein the residual coefficients are encoded by performing transformation,
• wherein the post processing information is used for performing a post processing on a reconstructed image, the reconstructed image being an image obtained based on the residual block of the current block, and
• wherein the post processing comprises padding at least one region to the reconstructed image,
• wherein the padding is performed by
• determining at least one equation defined as a function of a width of the image or a height of the image,
• determining a sample inside the reconstructed image based on the equation, and
• using the sample inside the reconstructed image for padding the region, and
• wherein the padding is performed by
• partitioning the reconstructed image into a plurality of partitioning units;
• and
• performing the padding for the each partitioning unit.