Image data encoding/decoding method and apparatus
Disclosed are methods and apparatuses for decoding an image. A method includes receiving a bitstream obtained by encoding the image; dividing a first coding block into a plurality of second coding blocks; generating a prediction block of a second coding block based on syntax information obtained from the bitstream; and reconstructing the second coding block based on the prediction block and a residual block of the second coding block, the residual block being obtained by performing a dequantization and an inverse-transform on quantized transform coefficients from the bitstream. The first coding block has a recursive division structure. The first coding block is divided based on at least one of a quad tree division, a binary tree division or a triple tree division.
1 . A method of decoding an image with a decoding apparatus, comprising:
receiving a bitstream in which the image is encoded;
obtaining division information for the image from the bitstream;
dividing, based on the division information, the image to obtain a current block;
identifying at least one reference sample adjacent to the current block included in the image;
performing prediction for a current block based on the at least one reference sample to generate a prediction block;
generating a residual block for the current block;
reconstructing the current block based on the prediction block and the residual block;
obtaining the reconstructed image based on the reconstructed current block; and
performing a data processing on the reconstructed image based on data processing information included in the bitstream,
wherein the image is divided by tree-based division including a quad-tree division, a binary tree division and a triple-tree division,
wherein the data processing comprises padding at least one region to the reconstructed image,
wherein the padding is performed by selecting one among a plurality of padding methods, and
wherein the plurality of padding methods comprises a first padding method which uses a same sample value for the region to be padded, the same sample value is determined based on information included in the data processing information, and a second padding method which uses a sample inside the reconstructed image for the region to be padded, the sample inside the reconstructed image is identified based on at least one equation using a size of the reconstructed image.
2 . A method of encoding an image with an encoding apparatus, comprising:
dividing the image to obtain a current block, division information for the image being encoded into a bitstream;
identifying at least one reference sample adjacent to the current block included in the image;
performing prediction for a current block based on the at least one reference sample to generate a prediction block;
generating a residual block based on the prediction block;
encoding the current block based on the residual block into the bitstream; and
encoding data processing information into the bitstream,
wherein the image is divided by tree-based division including a quad-tree division, a binary tree division and a triple-tree division,
wherein the data processing information is used for performing a data processing on a reconstructed image, the reconstructed image being an image obtained by decoding the bitstream,
wherein the data processing comprises padding at least one region to the reconstructed image,
wherein the padding is performed by selecting one among a plurality of padding methods, and
wherein the plurality of padding methods comprises a first padding method which uses a same sample value for the region to be padded, the same sample value is determined based on information included in the data processing information, and a second padding method which uses a sample inside the reconstructed image for the region to be padded, the sample inside the reconstructed image is identified based on at least one equation using a size of the reconstructed image.
3 . A method of transmitting a bitstream which is generated by a method of encoding an image, the method of encoding comprises:
dividing the image to obtain a current block, division information for the image being encoded into the bitstream;
identifying at least one reference sample adjacent to the current block included in the image;
performing prediction for a current block based on the at least one reference sample to generate a prediction block;
generating a residual block based on the prediction block;
encoding the current block based on the residual block into the bitstream;
encoding data processing information into the bitstream; and
transmitting the bitstream,
wherein the image is divided by tree-based division including a quad-tree division, a binary tree division and a triple-tree division,
wherein the data processing information is used for performing a data processing on a reconstructed image, the reconstructed image being an image obtained by decoding the bitstream,
wherein the data processing comprises padding at least one region to the reconstructed image,
wherein the padding is performed by selecting one among a plurality of padding methods, and
wherein the plurality of padding methods comprises a first padding method which uses a same sample value for the region to be padded, the same sample value is determined based on information included in the data processing information, and a second padding method which uses a sample inside the reconstructed image for the region to be padded, the sample inside the reconstructed image is identified based on at least one equation using a size of the reconstructed image.