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Dynamic image coding method and dynamic image coding device

A coding method and technology for moving images, applied in the field of moving image coding and moving image coding devices

Inactive Publication Date: 2004-05-19
PANASONIC CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0014] Therefore, the conventional image coding method is not limited to the same bit plane, and it is impossible to give priority to high image quality in important areas when the frequency band is low.

Method used

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  • Dynamic image coding method and dynamic image coding device
  • Dynamic image coding method and dynamic image coding device
  • Dynamic image coding method and dynamic image coding device

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Experimental program
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Embodiment 1

[0042] In this embodiment, a video encoding device is applied to a video encoding method that can give priority to high image quality in important areas in the low frequency band, and can also improve image quality in stages in the peripheral areas of the high frequency band. and an image decoding device will be described.

[0043] FIG. 2 is a block diagram showing the structure of a video coding apparatus to which the moving picture coding method according to Embodiment 1 of the present invention is applied.

[0044] The video encoding device 100 shown in FIG. 2 includes: a base layer encoder 110 for generating a base layer; an enhancement layer encoder 120 for generating an enhancement layer; a base layer band setting unit 140 for setting a base layer band; The expansion layer division width setting unit 150 of the bandwidth.

[0045] The base layer encoder 110 has: an image input unit 112 for inputting an image (original image) for each image; a base layer encoding unit 11...

Embodiment 2

[0100] In this embodiment, moving image coding is applied to the portion where the image quality of the base layer is greatly deteriorated in the low frequency band and the image quality of the important area is improved, and the peripheral area of ​​the high frequency band is also improved in stages. The video encoding device of the method is described.

[0101] Fig. 14 is a block diagram showing the structure of a video coding apparatus to which the moving picture coding method according to Embodiment 2 of the present invention is applied. This video encoding device 300 has the same basic structure as that of the video encoding device 100 shown in FIG. 2 , and the same components are assigned the same reference numerals, and their descriptions are omitted.

[0102] The feature of this embodiment is that enhancement layer encoder 120a has additional functions described later. That is, the video encoding device 300, like the video encoding device 100 shown in FIG. 2 , include...

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Abstract

A moving picture coding method capable of maintaining high picture quality for an important area even in a low bit rate and gradually improving picture quality of the neighboring area as the bit rate becomes higher. According to this method, the important area detection section 122 automatically detects an important area within a frame, the gradual shift map generation section 124 generates a gradual shift map whose shift value decreases gradually from the important area toward the neighboring area. The bit shift section 130 bit-shifts DCT coefficients according to the gradual shift map. In this way, more DCT coefficients which contribute to improvement of picture quality of the important area are stored in the start portion of the enhancement layer preferentially.

Description

technical field [0001] The present invention relates to a moving picture coding method and a moving picture coding device having a hierarchical data structure, and more particularly to a moving picture coding method and a moving picture coding device capable of maintaining high image quality in an important area of ​​a screen even in a low frequency band. Background technique [0002] The image data transmitted by the previous image transmission system can be transmitted in a certain transmission frequency band. Usually, it is compressed and encoded to a fixed frequency band by using H.261 method or MPEG (Moving Picture Experts Group) method. The encoded image data, even if the transmission frequency band is changed, the image quality will not be changed. [0003] However, with the diversification of networks in recent years, the frequency bands of transmission lines fluctuate greatly, and it is necessary to transmit image data with balanced quality images in multiple freque...

Claims

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Application Information

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IPC IPC(8): H04N19/60G06T9/00H03M7/30H04N19/102H04N19/115H04N19/132H04N19/137H04N19/154H04N19/167H04N19/176H04N19/33H04N19/34H04N19/36H04N19/37H04N19/46H04N19/625H04N19/70H04N19/85H04N19/91
CPCH04N7/26351H04N19/00781H04N19/00278H04N19/00442H04N19/00109H04N19/00096H04N19/0026H04N19/00139H04N19/126H04N19/129H04N19/136H04N19/17H04N19/176H04N19/34H04N19/61
Inventor 本田义雅上野山努
Owner PANASONIC CORP
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