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Image encoding method, image decoding method, image encoding device, image decoding device, integrated circuit, and program

A technology of image encoding and image decoding, applied in the field of image data compression, can solve the problems of high compression effect and inaccessibility

Inactive Publication Date: 2011-09-21
PANASONIC CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

In this case, the higher compression effect based on encoding will not be obtained

Method used

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  • Image encoding method, image decoding method, image encoding device, image decoding device, integrated circuit, and program
  • Image encoding method, image decoding method, image encoding device, image decoding device, integrated circuit, and program
  • Image encoding method, image decoding method, image encoding device, image decoding device, integrated circuit, and program

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Embodiment approach 1

[0133] The fundamental problem of the present invention is to use the same scan for transform coefficients of image blocks with different context characteristics such as edge direction and / or sharpness, and as a result, there may be a difference in the efficiency of encoding to be applied later. This is because the statistics of transform coefficients of different blocks within an image or image sequence (video) are not fixed.

[0134] In order to solve such problems, the present invention provides a method of encoding and a method of decoding image data divided into pixel blocks, and a device for encoding (encoder) and a device for decoding (decoder). Therefore, the scanning of the transform coefficients in the target block is sequentially performed in the scanning order determined according to the coefficient values ​​of the target block.

[0135] In hybrid image and video coding, the image is usually divided into blocks. The blocks can be of a predetermined fixed size or o...

Embodiment approach 2

[0206] By recording a program for realizing the steps of the image coding method or the image decoding method shown in the above-mentioned embodiments in a storage medium, the processing shown in the above-mentioned embodiments can be easily implemented in an independent computer system. The storage medium may be a magnetic disk, an optical disk, a magneto-optical disk, an IC card, a semiconductor memory, or the like as long as it can record a program.

[0207] In addition, an application example of the image encoding method and image decoding method described in the above-mentioned embodiments, and a system using the application example will be described here.

[0208] Figure 16 It is a diagram showing the overall configuration of the content providing system ex100 for realizing the content distribution service. The area for providing communication services is divided into desired sizes, and base stations ex106 to ex110 which are fixed wireless stations are installed in eac...

Embodiment approach 3

[0245] The image coding method and device, and the image decoding method and device described in the above-described embodiments can be typically realized by an integrated circuit, that is, an LSI. As an example, Figure 23 Indicates the structure of LSI ex500 that has been singulated. The LSI ex500 has elements ex501 to ex509 described below, and the respective elements are connected by a bus ex510 . The power supply circuit unit ex505 supplies electric power to each unit when the power supply is turned on, thereby starting to be in an operable state.

[0246] For example, when performing encoding processing, the LSI ex500 receives input of AV signals from the microphone ex117 and the camera ex113 through the AV I / O ex509 under the control of the control unit ex501 including the CPU ex502, the memory controller ex503, and the stream controller ex504. . The input AV signal is temporarily stored in an external memory ex511 such as SDRAM. According to the control of the cont...

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Abstract

Provided is an image encoding method which can effectively encode an image while maintaining the image quality at a certain level. The image encoding method encodes an image in a block unit. The method includes: a conversion step (S1201) which converts a two-dimensionally arranged pixel value in the block to be encoded into a two-dimensionally arranged conversion coefficient according to the two-dimensionally arranged conversion coefficient; a scan order determination step (S1202) which determines the scan order for scanning the two-dimensionally arranged conversion coefficient; a scan step (S1203) which successively scans the two-dimensionally arranged conversion coefficient in accordance with the scan order so as to generate a one-dimensionally arranged conversion coefficient string; and an encoding step (S1204) which encodes the one-dimensionally arranged conversion coefficient string.

Description

technical field [0001] The present invention relates to image data compression, in particular to compressing and decompressing image data with higher coding efficiency. Background technique [0002] Currently, many standard video coding algorithms are based on hybrid video coding. A typical hybrid video coding method combines different lossless compression methods and lossy compression methods in order to achieve a desired compression effect. Like the ISO / IEC standard (MPEG-X standard such as MPEG-1, MPEG-2, MPEG-4), hybrid video coding is also an ITU-T standard (such as H.261, H.263). H.26x standard specification) basis. The latest image coding standard specification is called H.264 / MPEG-4AVC (Advanced Video Coding, advanced video coding), which is a joint video team (JVT, JVT, Joint Video Team) standardization activities. [0003] The video signal input to the encoder is a sequence of images called frames, and each frame is composed of pixels arranged two-dimensionally...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04N7/32
CPCH04N19/00781H04N19/00278H04N19/00127H04N7/26244H04N19/00109H04N7/26122H04N19/00139H04N7/50H04N7/26095H04N7/26111H04N19/176H04N19/129H04N19/61H04N19/132H04N19/136
Inventor V·德吕容T·韦迪M·纳罗施克
Owner PANASONIC CORP
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