KR20140072936A - Apparatus and methods of sample adpative offset in enhancement-layer using parameters of sample adaptive offset in base-layer - Google Patents

Abstract

The present invention relates to a method and apparatus for applying and correcting sample adaptive offsets of an enhancement layer / viewpoint using a sample adaptive offset parameter of a reference layer / viewpoint in order to improve image encoding efficiency in a layer / will be.

Description

[0001] The present invention relates to a sample adaptive offset apparatus and method for improving layer using a sample adaptive offset parameter of a reference layer. ≪ RTI ID = 0.0 > [0002] < / RTI &

The present invention relates to a method and apparatus for extracting and / or transmitting parameters between various spatial and temporal resolutions and image qualities with respect to a video encoding and decoding method and apparatus.

Conventionally, video coding generally codes and decodes one resolution and bit rate suitable for an application. Due to the development of multimedia, scalable video coding (SVC), which is a video coding technology that supports various resolution and image quality according to various resolution and application environment, and multi view video Standardization and research on multi-view video coding (MVC) are underway. Such SVC and MVC are referred to as extended video part / decryption.

Enhanced video coding / decoding has been standardized as an extension of H.264 / AVC and is expected to be standardized as an extension of high efficiency video coding (HEVC) currently being standardized for next generation video coding.

The SVC can refer to and decode images with one or more space-time resolution and image quality, and MVC can refer to and decode images at one or more viewpoints. At this time, the unit of decoding / decoding for one image is referred to as a layer. The conventional video coding refers to the information added / decoded from one image, but the extended video coding / decoding performs the coding / decoding by referencing not only the image of the current layer but also the images of different temporal / spatial resolution and image quality or different viewpoints .

Research is underway on how to use or calibrate information at the reference layer / viewpoint at the enhancement layer / viewpoint when referring to the layer / viewpoint.

The present invention is for enhancing the coding efficiency by coding information by referring to the information of the reference layer in the enhancement layer / view portion in the layer / time reference structure. Improving encoding efficiency of an enhancement layer / viewpoint, thereby providing a service with the same image quality at a lower cost and providing a service with a higher image quality at the same bit rate. It is also an object of the present invention to improve coding efficiency by referring to information of a reference layer / viewpoint.

In order to solve the above problems, an enhancement layer / view sample adaptive offset apparatus using a sample adaptive offset parameter of a reference layer / viewpoint according to an embodiment of the present invention includes a reference layer / view decoder and an enhancement layer / view decoder do. The reference layer / view decoder includes an apparatus of a general video decoder such as an entropy decoding unit, an inverse quantization unit, an inverse transform unit, a motion compensation unit, an intra prediction unit, a loop filter unit, and a reconstructed image buffer. In addition to the entropy decoding unit, the inverse quantization unit, the inverse transform unit, the motion compensation unit, the intra prediction unit, the loop filter unit, and the restored image buffer, the enhancement layer / And an image generation unit. A reference layer / view sample adaptive offset parameter extractor, a reference layer / view sample adaptive offset applicator, and an enhancement layer / view sample adaptive offset compensator are also included.

In order to solve the above problems, an improved adaptive layer offset / sample adaptive offset method using a sample adaptive offset parameter of a reference layer / viewpoint according to an embodiment of the present invention includes extracting a sample adaptive offset parameter of a reference layer / , Determining whether to apply a sample adaptive offset parameter of the reference layer / viewpoint at the enhancement layer / viewpoint, applying a sample adaptive offset parameter of the reference layer / viewpoint, correcting the enhancement layer / view sample adaptive offset .

According to the embodiment of the present invention, enhancement layer / viewpoint image enhancement layer / viewpoint enhancement layer / viewpoint enhancement layer / viewpoint enhancement layer / viewpoint enhancement layer / view enhancement layer enhancement / . The advantage of using the sample adaptive offset parameter of the reference layer / view at the enhancement layer / viewpoint is to reduce the sample adaptive offset parameter of the enhancement layer / view being transmitted.

1 is a block diagram of an extended decoder including a reference layer / viewpoint and an enhancement layer / viewpoint.
2 is a block diagram of an extended decoder including a reference layer / viewpoint and an enhancement layer / viewpoint according to an embodiment of the present invention.
FIG. 3 is a diagram illustrating an example of a sample adaptive offset parameter extracting unit of a reference layer / viewpoint and a sample adaptive offset performing unit of an enhancement layer / viewpoint according to an embodiment of the present invention.
4 is a flowchart illustrating a sample adaptive offset parameter extracting unit and an enhancement layer / view sample adaptive offset performing unit of a reference layer / view according to an embodiment of the present invention.
5 illustrates an example of a sample adaptive offset parameter extractor of a reference layer / viewpoint, a sample adaptive offset parameter adjuster of a reference layer / viewpoint, and a sample adaptive offset performer of an enhancement layer / viewpoint according to an embodiment of the present invention FIG.
6 is a flowchart of a sample adaptive offset parameter extracting unit of a reference layer / viewpoint, a sample adaptive offset parameter adjusting unit of a reference layer / viewpoint, and a sample adaptive offset performing unit of an enhancement layer / viewpoint according to an embodiment of the present invention FIG.

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. In the following description of the embodiments of the present invention, a detailed description of known functions and configurations incorporated herein will be omitted when it may make the subject matter of the present disclosure rather unclear.

It is to be understood that when an element is referred to as being "connected" or "connected" to another element, it may be directly connected or connected to the other element, . In addition, the description of "including" a specific configuration in the present invention does not exclude a configuration other than the configuration, and means that additional configurations can be included in the practice of the present invention or the technical scope of the present invention.

The terms first, second, etc. may be used to describe various components, but the components should not be limited by the terms. The terms are used only for the purpose of distinguishing one component from another. For example, without departing from the scope of the present invention, the first component may be referred to as a second component, and similarly, the second component may also be referred to as a first component.

In addition, the components shown in the embodiments of the present invention are shown independently to represent different characteristic functions, which does not mean that each component is composed of separate hardware or software constituent units. That is, each constituent unit is included in each constituent unit for convenience of explanation, and at least two constituent units of the constituent units may be combined to form one constituent unit, or one constituent unit may be divided into a plurality of constituent units to perform a function. The integrated embodiments and separate embodiments of the components are also included within the scope of the present invention, unless they depart from the essence of the present invention.

In addition, some of the components are not essential components to perform essential functions in the present invention, but may be optional components only to improve performance. The present invention can be implemented only with components essential for realizing the essence of the present invention, except for the components used for the performance improvement, and can be implemented by only including the essential components except the optional components used for performance improvement Are also included in the scope of the present invention.

1 is a block diagram of an extended decoder including a reference layer / viewpoint and an enhancement layer / viewpoint. The enhancement decoder includes a reference layer / viewpoint 100 and an enhancement layer / viewpoint 110. The reference layer / viewpoint 100 and the enhancement layer / viewpoint 110 may be one or more. The reference layer / view decoder 100 has an entropy encoding unit 101, an inverse quantization unit 102, an inverse transformation unit 103, a motion compensation unit 104, A buffer 105, a loop filter 106, a restored image buffer 107, and the like.

2 is a block diagram of an extended decoder of the present invention. The parameter extracting unit 200 extracts the reference layer / view parameter decoded by the reference layer / view entropy decoding unit 201. The parameter of the reference layer / view extracted by the parameter extracting unit 200 is added to the input of the enhancement layer / view entropy decoding unit 202. At this time, in the enhancement layer / view entropy decoding unit 202, parameters of the reference layer / viewpoint may be used as they are, or parameters may be partially or entirely adjusted via the parameter adjustment unit 203. Parameters that have passed through the parameter adjustment unit 203 or not are input to the enhancement layer / view loop filter unit 204 to perform an enhancement layer / view loop filter.

FIG. 3 is a diagram illustrating an example of a sample adaptive offset parameter extracting unit of a reference layer / viewpoint and a sample adaptive offset performing unit of an enhancement layer / viewpoint according to an embodiment of the present invention. The reference layer / time SAO parameter extraction unit 301 extracts the SAO parameter of the reference layer / viewpoint and transmits it to the input of the enhancement layer / viewpoint SAO performing unit 302 to perform the enhancement layer / view SAO.

4 is a flowchart of a sample adaptive offset parameter extracting unit and an enhancement layer / view sample adaptive offset performing unit of a reference layer / view according to an embodiment of the present invention. When reference layer / view information is not referred to in the reference layer / view information determination process 401, enhancement layer / view SAO parameter information acquisition process 402 is performed. When the reference layer / view information is referenced in the reference layer 401, the reference layer / view SAO parameter information is obtained 403. Thereafter, the enhancement layer / view SAO operation 404 is entered.

5 illustrates an example of a sample adaptive offset parameter extractor of a reference layer / viewpoint, a sample adaptive offset parameter adjuster of a reference layer / viewpoint, and a sample adaptive offset performer of an enhancement layer / viewpoint according to an embodiment of the present invention FIG. The reference layer / view SAO parameter extractor 501 extracts the SAO parameter of the reference layer / viewpoint and performs a partial or entire adjustment on the SAO parameter in the SAO parameter adjuster 502. The SAO parameter output from the SAO parameter adjustment unit 502 is transmitted to the input of the enhancement layer / view SAO performance unit 502 to perform enhancement layer / view SAO.

6 is a flowchart of a sample adaptive offset parameter extracting unit of a reference layer / viewpoint, a sample adaptive offset parameter adjuster of a reference layer / viewpoint, and a sample adaptive offset performing unit of an enhancement layer / viewpoint according to an embodiment of the present invention FIG. The reference layer / viewpoint information is obtained through reference determination 601, and the enhancement layer / viewpoint SAO parameter information is obtained 602 without reference to the reference layer / viewpoint information. When the reference layer / view information is referred to in the reference layer / view information determination 601, the extracted SAO parameter after the reference layer / view SAO parameter information extraction 603 is extracted from the reference layer SAO parameter information adjustment 604), and performs adjustment for a part or all of the parameters. Thereafter, the enhancement layer / view SAO operation 605 is performed.

Claims (1)

In order to improve the image coding efficiency in the image / decoder using the hierarchical / inter-view reference structure, the sample adaptive offset parameter of the reference layer / viewpoint is used to apply and correct the sample adaptive offset of the enhancement layer / viewpoint Method and apparatus.

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