Image coding apparatus, image coding method, image decoding apparatus, image decoding method

An image encoding and image decoding technology, which is applied in the field of image encoding equipment, can solve the problem of increasing the amount of quantization matrix codes, and achieve the effect of reducing the amount of codes and efficient encoding/decoding

Active Publication Date: 2017-08-18
CANON KK
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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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  • Image coding apparatus, image coding method, image decoding apparatus, image decoding method
  • Image coding apparatus, image coding method, image decoding apparatus, image decoding method
  • Image coding apparatus, image coding method, image decoding apparatus, image decoding method

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Embodiment Construction

[0051] Various exemplary embodiments, features, and aspects of the present invention will be described in detail below with reference to the 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] in figure 1 , The block dividing unit 101 divides the input image into a plurality of blocks.

[0055] The prediction unit 102 predicts each block divided by the block dividing 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. If you want to process intra frames of moving images or still images, perform intra predic...

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Abstract

The invention relates to an image coding apparatus, an image coding method, an image decoding apparatus and an image 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 the application with the filing date of October 23, 2012, the application number of 201280054789.8, and the title of the invention of "image encoding equipment, image encoding method, image decoding equipment, 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. For (ITU-T H.264 (03 / 2010) Advanced Video Coding for General Audiovisual Services) H.264, by encoding the scaling list information, each element of the quantization matrix can be changed to any value. According to chapter 7.3.2.1.1.1 ...

Claims

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Application Information

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