KR20170033475A - Method and appratus for adaptive reference structure determination - Google Patents

Abstract

The present invention detects a scene change when a prediction is performed in a video encoder, and efficiently performs coding by improving coding speed and improving image quality by changing an adaptive reference structure.

Description

[0001] METHOD AND APPARATUS FOR ADAPTIVE REFERENCE STRUCTURE DETERMINATION [0002]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an image encoding and decoding technique, and more particularly, to a method and apparatus for improving a coding efficiency by changing a reference structure according to a scene change in a video encoder.

Recently, demand for high-resolution video services such as Full High Definition (FHD) and Ultra High Definition (UHD) has increased and demand for high-quality video services has increased. The Joint Collaborative Team on Video Coding (JCT-VC) was established in ISO / IEC MPEG (Moving Picture Expert Group) and ITU-T VCEG (Video Coding Expert Group) to improve the compression efficiency of H.264 / AVX more than twice (High Efficiency Video Coding), which is a new compression standard. In January 2013, development of standard technology for HEVC version 1 was completed, and then development of HEVC extension range (range extension) standard for various color formats and bit depth support is underway.

It is an object of the present invention to provide a method and apparatus for adaptively changing a configuration of a reference picture list, which is performed for encoding an input image, and encoding the reference picture list.

It is also an object of some embodiments of the present invention to provide a method and apparatus for analyzing an input image using a scene change detector for detecting a scene change of an input image.

It is to be understood, however, that the technical scope of the present invention is not limited to the above-described technical problems, and other technical problems may exist.

According to an aspect of the present invention, there is provided a video encoding apparatus including a scene change detector for detecting scene change of an input video.

In addition, the image encoding apparatus according to an embodiment of the present invention includes a reference structure changing unit for constructing a reference picture list through adaptation of a reference structure according to occurrence of a scene change.

According to another aspect of the present invention, there is provided a method of encoding an image, the method comprising: detecting scene change for an input image; And constructing a reference picture list by changing a reference structure according to the detected scene change image.

According to the above-mentioned object of the present invention, it is possible to improve the coding speed and the picture quality in the encoder, thereby increasing the efficiency of the encoder.

FIG. 1 is a block diagram of an image encoding apparatus according to an exemplary embodiment of the present invention. Referring to FIG.
2 is a schematic flowchart of an image encoder according to an embodiment of the present invention.
3 is a block diagram illustrating a scene change detector in accordance with an embodiment of the present invention.
4 is a diagram illustrating a reference structure of a general encoder according to an embodiment of the present invention.
5 is a diagram illustrating a reference structure changing method according to an embodiment of the present invention.

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings, which will be readily apparent to those skilled in the art. The present invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. In order to clearly illustrate the present invention, parts not related to the description are omitted, and similar parts are denoted by like reference characters throughout the specification.

Throughout the specification, when a part is connected to another part, it includes not only a direct connection but also a case where the part is electrically connected with another part in between. In addition, when a part includes an element, it does not exclude other elements unless specifically stated otherwise, but may include other elements.

Throughout this specification, when a section includes a constituent element, it is to be understood that the same shall not be construed as excluding other elements unless specifically stated to the contrary. The term (or step) or step of (~) used in the specification throughout does not imply a step for.

Also, 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.

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 described by arranging each constituent unit for convenience of explanation, and at least two constituent units of each constituent unit 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 the separate embodiments of each of these components are also included in the scope of the present invention without departing from the essence of the present invention.

First, the terms used in the present application will be briefly described as follows.

The video encoding apparatus may be a personal computer (PC), a notebook computer, a portable multimedia player (PMP), a wireless communication terminal, a smart phone, , A server included in a server terminal such as a TV server and a service server, and may be a user terminal such as various devices, a communication device such as a communication modem for performing communication with a wired or wireless communication network, A memory for storing various programs for in-screen prediction and data, and a microprocessor for executing and controlling programs and the like.

A moving picture can be generally composed of a series of pictures, and each picture can be divided into a coding unit such as a block. In addition, the term " picture " described below has an equivalent meaning such as an image, a frame,  It will be understood by those skilled in the art that the present invention can be used in place of other terms having the same meaning as described above.

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings. In the description of the present invention, the same elements will not be described in detail.

1 is a block diagram illustrating an encoding apparatus according to an embodiment of the present invention.

1, the encoding apparatus 100 includes a scene change detection unit 101, a reference structure change unit 102, an intra prediction unit 103, an inter picture prediction unit 104, a conversion unit 105, An inverse quantization unit 108, an inverse transform unit 109, a deblocking unit 110, a sample adaptive offset unit 111, a reference image buffer 112, .

2 is a flowchart illustrating the execution of the scene change detection unit 201 and the reference structure change unit 203 in the image encoding apparatus 100 according to the embodiment of the present invention. (201), and the reference structure (202) can be adaptively changed (203) according to whether or not the scene change is performed within the SOP (Structure Of Picture).

FIG. 3 is a block diagram illustrating an exemplary embodiment of a scene change detector 300 for performing an action of an input image storage unit 301, a scene change determination unit 302, and a scene change display unit 303 for scene change detection. It is a block diagram.

The scene change detection unit 101 may store (301) a certain amount of pictures in a buffer (302) and may detect a scene change (302), and display the pictures in which a scene change occurred when a scene change is detected within the SOP (303).

4 is a diagram illustrating a reference structure for performing inter-picture prediction of a general encoding apparatus according to an embodiment of the present invention.

The general encoding apparatus refers to only an I frame for performing the intra picture prediction unit 103 and one picture that has already been encoded without using a reference picture and outputs a P frame for performing the inter picture prediction unit 104 and two pictures Frame prediction unit 104 with reference to the B-frame.

According to FIG. 4, a general encoder uses inter picture prediction coding using temporal correlation properties.

FIG. 5 is a diagram illustrating a change of a reference structure according to a scene change in an encoding apparatus according to an embodiment of the present invention.

5A, when the encoding apparatus 100 detects a scene change in the fourth picture (101), the reference structure is changed so that reference to the previous picture is not performed based on the picture in which the scene change has occurred .

5B, when the scene change is detected in the fifth picture in the encoding apparatus 100 (101), the reference picture list is set such that the reference to the previous picture is not performed on the basis of the picture in which the scene change has occurred Specifically, unlike a general encoding apparatus, the reference structure can be changed so that reference to a previous picture is not performed based on a picture in which a scene change has occurred.

Not applicable.

Claims (2)

A video encoding apparatus comprising:
A scene change detection unit for detecting whether or not a scene change occurs;
A scene change picture display unit for displaying a scene change state of the detected scene change picture;
A reference structure changing unit for changing a reference structure for an image in which the scene change occurs;
And constructing a reference picture list using the scene change information. The method according to claim 1,
And performing a reference structure change using the scene change information.

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