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US 10,477,252 B2Granted
Method and apparatus for employing dynamic range mapping information for HDR image decoder considering backward compatibility
AssigneeKwangwoon University Industry-Academic Collaboration Foundation
InventorsDonggyu Sim, Seanae Park, Yongjo Ahn, Jonghyun Ma, Jeongyun Lim
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Abstract
The present invention enables efficient decoding by using DR mapping information between a base layer and an enhancement layer in various manners in an HDR decoder considering backward compatibility.
Claims2
A method of decoding an image, the method comprising:
- analyzing an image characteristic of a current image by using one or more pixels of the current block and one or more pixels of a neighboring block;
- determining mapping information based on the analyzed image characteristic;
- and
- decoding the current image based on the mapping information,
- wherein the mapping information is determined for each of a plurality of intervals, the plurality of intervals being obtained by dividing a luminance range for the current image equally or inequally, and
- the determining the mapping information comprises
- identifying an interval for the current image from among the plurality of intervals based on the analyzed image characteristic,
- obtaining modification information corresponding to the identified interval, and
- modifying the mapping information by adding the mapping information and the modification information,
- wherein whether to modify the mapping information is determined based on a flag transmitted from an image encoding apparatus,
- wherein the modification information is included in a sequence parameter set (SPS) in a bitstream received from an image encoding apparatus,
- wherein the modification information is received for an interval which needs to be modified, and
- wherein the modification information comprises information on a position of the interval which needs to be modified and a modification value needed for the modification.
10 more elements
A method of encoding an image, the method comprising:
- analyzing an image characteristic of a current image by using one or more pixels of the current block and one or more pixels of a neighboring block;
- determining mapping information based on the analyzed image characteristic;
- and
- encoding the current image based on the mapping information,
- wherein the mapping information is determined for each of a plurality of intervals, the plurality of intervals being obtained by dividing a luminance range for the current image equally or inequally, and
- the determining the mapping information comprises
- identifying an interval for the current image from among the plurality of intervals based on the analyzed image characteristic,
- obtaining modification information corresponding to the identified interval, and
- modifying the mapping information by adding the mapping information and the modification information,
- wherein a flag used to determine whether to modify the mapping information is encoded by an image encoding apparatus,
- wherein the modification information is encoded into a sequence parameter set (SPS) by an image encoding apparatus,
- wherein the modification information is encoded received for an interval which needs to be modified, and
- wherein the modification information comprises information on a position of the interval which needs to be modified and a modification value needed for the modification.
10 more elements
Dependencies are inferred from the claim text.