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.
Claims3
An image decoding method, comprising:
- obtaining transform coefficients of a current block from a bitstream;
- generating a residual block of the current block based on performing dequantization and inverse transform on the transform coefficients;
- determining a prediction mode of the current block among a plurality of prediction modes;
- generating a prediction block of the current block based on the determined prediction mode;
- reconstructing the current block in a current picture based on the prediction block and the residual block;
- performing first filtering on pixels in the current block including deblocking filtering;
- decoding information about second filtering range of the current block;
- and
- performing second filtering based on the information about second filtering range;
- wherein the information about second filtering range includes information about a maximum value of pixel values in the current picture, and
- wherein the second filtering remaps pixel values within the second filtering range to a new range.
An image encoding method, comprising:
- obtaining transform coefficients of a current block;
- generating a residual block of the current block based on performing dequantization and inverse transform on the transform coefficients;
- determining a prediction mode of the current block among a plurality of prediction modes;
- generating a prediction block of the current block based on the determined prediction mode;
- reconstructing the current block in a current picture based on the prediction block and the residual block;
- performing first filtering on pixels in the current block including deblocking filtering;
- determining information about second filtering range of the current block;
- and
- performing second filtering based on the information about second filtering range;
- wherein the information about second filtering range includes information about a maximum value of pixel values in the current picture, and
- wherein the second filtering remaps pixel values within the second filtering range to a new range.
A method of transmitting a bitstream, comprising:
- generating a bitstream by an image encoding method;
- and
- transmitting the bitstream,
- wherein the image encoding method comprises:
- obtaining transform coefficients of a current block;
- generating a residual block of the current block based on performing dequantization and inverse transform on the transform coefficients;
- determining a prediction mode of the current block among a plurality of prediction modes;
- generating a prediction block of the current block based on the determined prediction mode;
- reconstructing the current block in a current picture based on the prediction block and the residual block;
- performing first filtering on pixels in the current block including deblocking filtering;
- determining information about second filtering range of the current block;
- and
- performing second filtering based on the information about second filtering range;
- wherein the information about second filtering range includes information about a maximum value of pixel values in the current picture, and
- wherein the second filtering remaps pixel values within the second filtering range to a new range.
Dependencies are inferred from the claim text.