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Video coding device and video decoding device

a video coding and video decoding technology, applied in the field of digital video processing, can solve the problems of not being able to adapt to an input image composed of different sizes of components in format, not being able to adapt to the input image, and the prior art system encounters several inconvenient problems, so as to improve the subjective quality of the reproduced image

Inactive Publication Date: 2005-02-03
SHARP KK
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

The present invention provides a video coding and decoding system that effectively transmits and encodes image data using subband decomposition and coefficient coding, followed by rearranging and variable-length encoding of the data. The system also allows for separate transmission and decoding of different components of the image, improving subjective image quality by prioritizing the transmission of components with higher visual impact. The video coding and decoding devices operate with integrated component units that include m (m≧1) pieces of frequency coefficients with the same relative positions in m (m≧1) subbands of the components. The technical effects of the invention include improved image quality, efficient data transmission, and improved video coding and decoding efficiency.

Problems solved by technology

However, the prior art system encounters several inconvenient problems resulting from the fixed transfer-unit of a line.
Therefore, it cannot be adaptable to an input image composed of different sizes of components in format of, e.g., 4:2:2 or 4:2:0.
Furthermore, the prior art system presumes that respective components of an image have the same number of subbands and cannot be adaptable to an input image whose components are divided into different numbers of subbands.

Method used

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  • Video coding device and video decoding device
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Experimental program
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first embodiment

[0076] This makes it possible to conduct variable-length coding of the coded coefficient data by, e.g., an arithmetic coding method besides the Huffman coding method. According to the present invention, it is also possible to conduct rearrangement of the coded coefficient data after variable-length coding as the prior art device does. The operation of the first embodiment is described below with an input image composed of three components Y (luminance), U (chrominance) and V (chrominance), which is the same as that used in the prior art device. In this embodiment, these components have the same resolution, i.e., the same image sizes.

[0077] An integrated component unit may be prepared from coefficient-coded data by combining elements Y, U and V. The following example is an integrated component unit that is prepared of subbands of Y, U and V.

[0078]FIG. 9 shows coefficients of subband images obtained through performing three times of subband-decomposition of respective image component...

second embodiment

[0149] In the present invention, it is possible to give coded data a hierarchical structure even if components of an image have different sizes. The decoding side can decode entire decoded data and can also obtain an entire reproduced image from a part of the coded data.

[0150] Although the second embodiment has been described with only an image having components whose horizontal and vertical size ratio is 2:1:1, it can treat other size ratios of image components in the similar manner as described above.

[0151] A third embodiment of the present invention is adaptable to the case of processing image components being different in size and decomposed into different numbers of decomposition levels by the subband decomposing portion 101 of FIG. 7. This embodiment of the present invention is similar to the first embodiment except for the operation of the transfer-order deciding and rearranging portion 104 (step of outputting an integrated component unit). Therefore, the same portions are n...

third embodiment

[0176] In the present invention, an image whose components have different sizes and different decomposition levels can be encoded so that coded data having a hierarchical structure is obtained at the coding side and an entire image is reproduced from the entire coded data or a part of the coded data at the decoding side.

[0177] Although the third embodiment has been described by way of example with only an image having components whose size ratio is of 2:1:1, it can treat other size ratios of image components in the similar manner as described above. For example, an image whose components Y, U and V are the same in size and have different numbers of subbands can be encoded to have a hierarchical structure through the same process as described above in the third embodiment. The transmitting orders corresponding to those shown in FIGS. 11 and 13 are also adopted besides the described order of FIG. 10.

[0178] The three embodiments of the present invention have been described by way of e...

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Abstract

A video coding device capable of adaptively processing input video data according to property of the data and realizing effective progressive transmission of the coded data even if image components are different in size and / or different in the number of subbands. The above-mentioned object can be realized by the provision of a transferring-order deciding and ranging portion that can prepare an integrated component unit by forming combinations of subband-based frequency-coefficients of respective components Y, U and V and can change the number of respective elements of respective components Y, U and V.

Description

TECHNICAL FIELD [0001] The present invention pertains to the field of digital video processing and relates to a video coding device for efficiently encoding video data and a video decoding device for decoding video data coded by the video coding device. BACKGROUND ART [0002] Recently, there has been proposed a subband coding method that can efficiently encode and decode video signals. The well-known high-efficient subband encoding method is used to decompose an input image into frequency bands by a bank of band-decomposing filters. The band-decomposing filter-bank is a one-dimensional filter-bank that can serve as a two-dimensional band-decomposing filter-bank by repeating processing the input image in horizontal and vertical directions. This method was reported by Fujii, Noumura. “Topics on Wavelet Transform” in a Report of “TECHNICAL REPORT of IEICE, IE92-11, 1992”. [0003] In the prior art, a subband image as shown in FIG. 1B obtained by conducting two-dimensional subband decompos...

Claims

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Application Information

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Patent Type & Authority Applications(United States)
IPC IPC(8): G06T9/00H04N1/41H04N11/04H04N19/00H04N19/33H04N19/423H04N19/436H04N19/46H04N19/60H04N19/635H04N19/70H04N19/91
CPCH04N11/042H04N19/13H04N19/63H04N19/36H04N19/61H04N19/186H04N19/64H04N19/129
Inventor AONO, TOMOKOSAIGA, HISASHIKATATA, HIROYUKIKUSAO, HIROSHI
Owner SHARP KK
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