Coding apparatus, coding method, decoding apparatus, and decoding method

一种编码设备、解码设备的技术，应用在图像通信、数字视频信号修改、电气元件等方向，能够解决量化矩阵代码量增大等问题，达到降低代码量、高效编码/解码的效果

Active Publication Date: 2017-08-22
CANON KK
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  • Claims
  • Application Information

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Problems solved by technology

[0005] However, with zigzag scanning used in H.264, since each element of the quantization matrix is ​​scanned in a diagonal direction, the code amount of the quantization matrix increases according to the characteristics of the quantization matrix

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  • Coding apparatus, coding method, decoding apparatus, and decoding method
  • Coding apparatus, coding method, decoding apparatus, and decoding method
  • Coding apparatus, coding method, decoding apparatus, and decoding method

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Embodiment Construction

[0051] Various exemplary embodiments, features, and aspects of the invention are described in detail below with reference to the accompanying drawings.

[0052] In the context of this specification, the Figure 13B The scanning method shown for a two-dimensional matrix is ​​called horizontal scanning, and will Figure 13D The scanning method shown for a two-dimensional matrix is ​​called vertical scanning.

[0053] figure 1 is a block diagram showing an image encoding device according to the first exemplary embodiment of the present invention.

[0054] exist figure 1 In , the block division unit 101 divides the input image into a plurality of blocks.

[0055]The prediction unit 102 predicts each block divided by the block division unit 101 in units of blocks, determines a prediction method, calculates a difference according to the determined prediction method, and also calculates a prediction error. Intra-prediction is performed if an intra-frame of a moving image or a ...

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Abstract

The invention relates to a coding apparatus, a coding method, a decoding apparatus, and a decoding method. An image coding apparatus includes a block dividing unit configured to divide an input image into a plurality of blocks, a prediction unit configured to perform prediction based on coded pixels to generate prediction errors, a transformation unit configured to perform orthogonal transform to the prediction errors to generate transform coefficients, a quantization matrix generation unit configured to generate quantization matrices that are used to quantize the transform coefficients, a quantization matrix coding unit configured to calculate difference values by scanning the quantization matrices and to code the difference values, a quantization unit configured to generate quantization coefficients by quantizing the generated transform coefficients using the quantization matrices, and a coefficient coding unit configured to code the quantization coefficients, wherein the quantization matrix coding unit is configured to scan coefficients of the quantization matrices in a unidirectional manner to calculate the difference value.

Description

[0001] (This application is a divisional application of an application with an application date of October 23, 2012, an application number of 201280054789.8, and an invention title of "image coding device, image coding method, image decoding device, image decoding method, and storage medium".) technical field [0002] The present invention relates to an image encoding device, an image encoding method, an image decoding device, an image decoding method and a storage medium. More specifically, the present invention relates to an encoding / decoding method of a quantization matrix in an image. Background technique [0003] As a compression recording standard for moving images, H.264 / MPEG-4 AVC (hereinafter referred to as H.264) is known. With (ITU-T H.264 (03 / 2010) Advanced Video Coding for General Audiovisual Services) H.264, each element of the quantization matrix can be changed to an arbitrary value by encoding scaling list information. According to chapter 7.3.2.1.1.1 of H.2...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04N19/129H04N19/463H04N19/126
CPCH04N19/11H04N19/126H04N19/129H04N19/162H04N19/167H04N19/18H04N19/196H04N19/463H04N19/176
Inventor 志摩真悟
Owner CANON KK
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