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Resolution conversion upon hierarchical coding and decoding

A technology of coding and coding method, applied in the field of resolution conversion, which can solve the problems of image degradation and inability to remove aliasing, etc.

Inactive Publication Date: 2008-06-04
CANON KK
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, even in this case, aliasing cannot be eliminated because the high-frequency components are blocked in the conventional method, and there is a disadvantage that the aliasing component remains and the image deteriorates.
Likewise, although it is possible to achieve 4:1:1 by blocking the horizontal component of the color, and 4:1:0 by blocking the vertical and horizontal components of the color, the same disadvantages apply

Method used

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  • Resolution conversion upon hierarchical coding and decoding
  • Resolution conversion upon hierarchical coding and decoding
  • Resolution conversion upon hierarchical coding and decoding

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Embodiment Construction

[0082] Hereinafter, the preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings.

[0083] In the first to eighth embodiments of the present invention, it is implemented as an image reproducing device and an image recording device using hierarchical coding processing, and it is particularly effective for a device that outputs a mid-level image. In addition, in the form of this embodiment, a case where the discrete wavelet transform method conforming to JPEG2000 is used as an example of hierarchical coding will be described.

[0084]

[0085] First use figure 1 The flow chart of is an overview of the first embodiment.

[0086] First, the output image size is detected in step S101, the input image size is detected in step S102, and the process proceeds to step S103.

[0087] In step S103, the required minimum decoding level is determined from the output image size and the input image size obtained in steps S102 and S103...

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Abstract

A method which executes encoding to the image laminatedly includes the following procedures: a frequency restricting procedure which does restriction to the frequency component which is in the image signal of the image and becomes the reason for aliasing generating in the hierarchy separation; and a hierarchy separating procedure which does hierarchy separation to the image signal restricted in the frequency restricting procedure.

Description

[0001] The present invention is a divisional application of a patent application whose application number is 200310101769.4, the filing date is October 23, 2003, and the invention title is "resolution conversion during layered coding and decoding". Technical field [0002] The present invention relates to image resolution conversion, and more particularly to resolution conversion using a hierarchical coding method. Background technique [0003] In recent years, with the remarkable development of computing and the Internet, various types of information such as character data, image data, and sound data have been stored or transmitted in computers and between networks. Since these data include a large number of images, especially multi-valued images, the amount of data is huge, and there is a problem that resources such as memory and communication lines are consumed during storage and transmission. For this reason, during image storage and transmission, high-efficiency coding that r...

Claims

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Application Information

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IPC IPC(8): H04N7/26G11B20/10G06T9/00H03M7/30H04N19/60H04N1/387H04N1/41H04N19/63H04N19/80H04N19/85
Inventor 大和田满
Owner CANON KK