Image encoding method/device, image decoding method/device and recording medium having bitstream stored thereon
AssigneeIndustry Academy Cooperation Foundation of Sejong University
InventorsJoo Hee Moon, Dong Jae Won, Sung Won Lim
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Abstract
The present invention provides an image encoding method and an image decoding method. The image decoding method, according to the present invention, comprises the steps of: decoding information associated with a clipping range of a current block; and performing sample adaptive offset (SAO) filtering on the basis of the information associated with the clipping range, wherein the information associated with the clipping range may include information on the maximum and minimum values of a pixel value included in the current block.
Claims11
An image decoding method, comprising:
- decoding band index information of a current block;
- performing first filtering on pixels in the current block, based on the band index information;
- and
- performing in-loop filtering in the current block after the first filtering,
- wherein the in-loop filtering includes a sample adaptive offset (SAO) mode,
- wherein N bands are generated by dividing a range of pixels according to a bit depth,
- wherein the band index information comprises first band index information indicating a band including a maximum value of the pixels among the N bands and second band index information indicating a band including a minimum value of the pixels among the N bands,
- wherein the sample adaptive offset (SAO) mode includes an edge offset mode and a band offset mode, and
- wherein the method further comprises, decoding SAO mode information indicating whether to which one of the edge offset mode and the band offset mode is performed.
An image encoding method, comprising:
- determining at least one band of a current block;
- performing first filtering on pixels in the current block, based on the at least one band;
- performing in-loop filtering in the current block after the first filtering,
- wherein the in-loop filtering includes a sample adaptive offset (SAO) mode, and encoding band index information related to the at least one band,
- wherein N bands are generated by dividing a range of pixels according to a bit depth,
- wherein the band index information comprises first band index information indicating a band including a maximum value of the pixels among the N bands and second band index information indicating a band including a minimum value of the pixels among the N bands,
- wherein the sample adaptive offset (SAO) mode includes an edge offset mode and a band offset mode, and
- wherein the method further comprises, encoding SAO mode information indicating whether to which one of the edge offset mode and the band offset mode is performed.
A non-transitory computer-readable recording medium storing a bitstream generated by an image encoding method, the method comprising:
- determining at least one band of a current block;
- performing first filtering on pixels in the current block based on the at least one band;
- performing in-loop filtering in the current block after the first filtering, wherein the in-loop filtering includes a sample adaptive offset (SAO) mode;
- and
- encoding band index information related to the at least one band,
- wherein N bands are generated by dividing a range of pixels according to a bit depth,
- wherein the band index information comprises first band index information indicating a band including a maximum value of the pixels among the N bands and second band index information indicating a band including a minimum value of the pixels among the N bands,
- wherein the sample adaptive offset (SAO) mode includes an edge offset mode and a band offset mode, and
- wherein the method further comprises, encoding SAO mode information indicating whether to which one of the edge offset mode and the band offset mode is performed.
Dependencies are inferred from the claim text.