Image coding apparatus, image coding method, image decoding apparatus, image decoding method, and storage medium

A technology of image coding and equipment, applied in image communication, digital video signal modification, electrical components, etc., can solve the problem of increasing the amount of code in the quantization matrix, and achieve the effect of reducing the amount of code and efficient encoding/decoding

Active Publication Date: 2014-07-16
CANON KK
View PDF7 Cites 6 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] 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

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Image coding apparatus, image coding method, image decoding apparatus, image decoding method, and storage medium
  • Image coding apparatus, image coding method, image decoding apparatus, image decoding method, and storage medium
  • Image coding apparatus, image coding method, image decoding apparatus, image decoding method, and storage medium

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0050] Various exemplary embodiments, features, and aspects of the invention are described in detail below with reference to the accompanying drawings.

[0051] 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.

[0052] figure 1 is a block diagram showing an image encoding device according to the first exemplary embodiment of the present invention.

[0053] exist figure 1 In , the block division unit 101 divides the input image into a plurality of blocks.

[0054] 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...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

PUM

No PUM Login to view more

Abstract

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

technical field [0001] 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 [0002] H.264 / MPEG-4 AVC (hereinafter referred to as H.264) is known as a compression recording standard for moving images. 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.264, each element of a quantization matrix can take an arbitrary value by adding a delta scale which is the difference between an element and its previous element. [0003] For H.264, each element of the quantization matrix is ​​scanned in a direction from the element corresponding to the low freq...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

Application Information

Patent Timeline
no application Login to view more
Patent Type & Authority Applications(China)
IPC IPC(8): H04N19/503H04N19/124
CPCH04N19/11H04N19/126H04N19/129H04N19/162H04N19/167H04N19/18H04N19/196H04N19/463H04N19/176
Inventor 志摩真悟
Owner CANON KK
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Try Eureka
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap