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US 12,598,298 B2Granted
Method and apparatus for reconstructing 360-degree image according to projection format
AssigneeB1 Institute of Image Technology, Inc.
InventorKi Baek Kim
Life of this patent
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Abstract
Disclosed are methods and apparatuses for image data encoding/decoding. A method for decoding a 360-degree image includes the steps of: receiving a bitstream obtained by encoding a 360-degree image; generating a prediction image by making reference to syntax information obtained from the received bitstream; adding the generated prediction image to a residual image obtained by dequantizing and inverse-transforming the bitstream, so as to obtain a decoded image; and reconstructing the decoded image into a 360-degree image according to a projection format. Therefore, the performance of image data compression can be improved.
Claims5
A method of decoding an image with a decoding apparatus, comprising:
- receiving encoding data for a current block included in the image;
- determining, based on the encoding data, whether to perform type-based partitioning for the current block, the current block being partitioned into a plurality of sub-partitions when the type-based partitioning being performed for the current block;
- parsing syntax elements for a residual block of the current block from the encoding data;
- obtaining residual coefficients of the residual block based on the syntax elements for the residual block;
- obtaining the residual block based on the residual coefficients of the residual block, the residual block being obtained for each of the plurality of sub-partitions when the type-based partitioning being performed for the current block;
- generating a prediction block for the current block, the prediction block being generated for each of the plurality of sub-partitions when the type-based partitioning being performed for the current block;
- reconstructing the current block based on the residual block and the prediction block to reconstruct the image;
- performing in-loop filtering including a deblocking filtering for the reconstructed image;
- and
- performing a post processing on the in-loop filtered reconstructed image based on post processing information included in the encoding data,
- wherein the residual coefficients are obtained by performing inverse-quantization,
- wherein the post processing comprises padding at least one region to the in-loop filtered reconstructed image,
- wherein the padding is performed by
- determining at least one equation which uses a width of the image or a height of the image,
- determining a sample inside the in-loop filtered reconstructed image based on the equation, and
- using the sample inside the in-loop filtered reconstructed image for padding the region.
13 more elements
A method of encoding an image with an encoding apparatus, comprising:
- determining whether to perform type-based partitioning for a current block included in the image, the current block being partitioned into a plurality of sub-partitions when the type-based 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 type-based 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 type-based 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 quantization,
- wherein the post processing information is used for performing a post processing on an in-loop filtered reconstructed image, the in-loop filtered reconstructed image being obtained by performing in-loop filtering on a reconstructed image which is obtained based on the residual block of the current block, and
- wherein the post processing comprises padding at least one region to the in-loop filtered reconstructed image,
- wherein the padding is performed by
- determining at least one equation which uses a width of the image or a height of the image,
- determining a sample inside the in-loop filtered reconstructed image based on the equation, and
- using the sample inside the in-loop filtered reconstructed image for padding the region.
11 more elements
A non-transitory computer readable recoding medium storing encoding data which is generated by a method of encoding an image, the method of encoding comprises:
- determining whether to perform type-based partitioning for a current block included in the image, the current block being partitioned into a plurality of sub-partitions when the type-based 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 type-based 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 type-based 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 quantization,
- wherein the post processing information is used for performing a post processing on an in-loop filtered reconstructed image, the in-loop filtered reconstructed image being obtained by performing in-loop filtering on a reconstructed image which is obtained based on the residual block of the current block, and
- wherein the post processing comprises padding at least one region to the in-loop filtered reconstructed image,
- wherein the padding is performed by
- determining at least one equation which uses a width of the image or a height of the image,
- determining a sample inside the in-loop filtered reconstructed image based on the equation, and
- using the sample inside the in-loop filtered reconstructed image for padding the region.
11 more elements
A method of transmitting a bitstream, the method comprises:
- determining whether to perform type-based partitioning for a current block included in the image, the current block being partitioned into a plurality of sub-partitions when the type-based 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 type-based 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 type-based 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 quantization,
- wherein the post processing information is used for performing a post processing on an in-loop filtered reconstructed image, the in-loop filtered reconstructed image being obtained by performing in-loop filtering on a reconstructed image which is obtained based on the residual block of the current block, and
- wherein the post processing comprises padding at least one region to the in-loop filtered reconstructed image,
- wherein the padding is performed by
- determining at least one equation which uses a width of the image or a height of the image,
- determining a sample inside the in-loop filtered reconstructed image based on the equation, and
- using the sample inside the in-loop filtered reconstructed image for padding the region.
12 more elements
Dependencies are inferred from the claim text.