Image encoding/decoding method and device therefor

A technology of image and coded image, applied in image communication, digital video signal modification, electrical components, etc., can solve the problems of memory storage, memory access rate and processing capacity growth, and achieve the effect of reducing the amount of data

Active Publication Date: 2019-12-27
LG ELECTRONICS INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

To handle such content would result in a dramatic increase in memory storage, memory access rates, and processing power

Method used

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  • Image encoding/decoding method and device therefor
  • Image encoding/decoding method and device therefor
  • Image encoding/decoding method and device therefor

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0152] In an embodiment of the present disclosure, an encoder / decoder may hierarchically configure a scanning order of transform coefficients. In other words, the encoder / decoder may divide the transform block (or residual block or scan processing block) into coefficient groups, and then perform scanning in units of the divided coefficient groups. Groups of coefficients may be referred to as sub-blocks, sub-groups, sub-groups of coefficients, and the like.

[0153] The encoder / decoder may scan the transform coefficients in each coefficient group while scanning the transform coefficients in units of coefficient groups divided from the transform block according to the scanning order. For example, a coefficient group may be a block with a size of 4x4. will refer to the following Figure 7 Describe it.

[0154] Figure 7 is a diagram illustrating a method for scanning transform coefficients in units of coefficient groups as an embodiment to which the present disclosure is appl...

Embodiment 2

[0214] In an embodiment of the present disclosure, the encoder / decoder may determine the scanning order of each coefficient in the coefficient group based on the size or shape of the coefficient group. That is, the encoder / decoder may determine the scan order of the coefficients in the coefficient group of Equation 2 above according to the size or shape of the block.

[0215] Figure 12 and Figure 13 is a diagram illustrating a scan order depending on the position of transform coefficients in a block according to an embodiment of the present disclosure.

[0216] refer to Figure 12 , the encoder / decoder can scan the coefficients in the order of increasing d values ​​in diagonal scan order. Here, d represents the distance of the corresponding coefficient based on the upper left coefficient. The encoder / decoder may scan coefficients at positions having the same d value from the lower left side to the upper right side.

[0217] Here, the value of d can be determined as d=dx...

Embodiment 3

[0262] In an embodiment of the present disclosure, a method for determining a scan order of coefficient groups is proposed. For example, an encoder / decoder can determine for Figure 9 (c) constitute CG 1 The scan order of the four coefficient groups of (1,1).

[0263] The encoder / decoder can scan scan groups in a diagonal scan order, such as Figure 9 As shown in (c). In addition, the encoder / decoder may apply the scan method described in Examples 1 and 2 above when determining the scan order between coefficient groups, and apply the scan order with a random order.

[0264] Figure 18 is a diagram illustrating a method for determining a scanning order of coefficient groups as an embodiment to which the present disclosure is applied.

[0265] refer to Figure 18 , the encoder / decoder may be configured to similarly use the scanning order of the coefficient groups and the scanning order of the coefficients within the coefficient group, or be configured to use each scanning ...

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PUM

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Abstract

The present invention discloses an image encoding/decoding method and a device therefor. Specifically, an image encoding method may comprise the steps of: generating a quantized transform block by performing transform and quantization on a residual signal of a current block; splitting the quantized transform block into a plurality of coefficient groups; determining a first scan order representingthe scan order among the coefficients of the coefficient groups; and entropy encoding the coefficients of the quantized transform block according to the first scan order, and a second scan order representing the scan order among the plurality of coefficient groups.

Description

technical field [0001] The present disclosure relates to a still image or moving image processing method, and more particularly, to a method for encoding / decoding a transformed residual signal and an apparatus supporting the same. Background technique [0002] Compression coding refers to a series of signal processing techniques for sending digitized information over communication lines, or for storing information in a form suitable for storage media. Media including pictures, images, audio, etc. may be targets for compression encoding, and in particular, a technique of performing compression encoding on pictures is called video image compression. [0003] Next-generation video content is assumed to be characterized by high spatial resolution, high frame rate, and high dimensionality of scene representation. To process such content would result in a dramatic increase in memory storage, memory access rate and processing power. [0004] Therefore, there is a need to design a...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04N19/13H04N19/124H04N19/129H04N19/119H04N19/176
CPCH04N19/119H04N19/129H04N19/157H04N19/18H04N19/91H04N19/176H04N19/13H04N19/124H04N19/30
Inventor 具文模金昇焕
Owner LG ELECTRONICS INC
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