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Lifting scheme-based 9/7 wavelet inverse transformation image decompressing method

A wavelet inverse transform and decompression technology, applied in image communication, television, electrical components, etc., can solve problems such as being unsuitable for non-Euclidean spaces, and achieve the effect of reducing repetitive calculations, short delay, and fast processing speed

Inactive Publication Date: 2013-04-24
BEIHANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] The traditional first-generation wavelet transform constructs the wavelet base through the translation and stretching of the base in the Euclidean space, which is not suitable for applications in non-Euclidean spaces.

Method used

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  • Lifting scheme-based 9/7 wavelet inverse transformation image decompressing method
  • Lifting scheme-based 9/7 wavelet inverse transformation image decompressing method
  • Lifting scheme-based 9/7 wavelet inverse transformation image decompressing method

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Embodiment Construction

[0035] The present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0036] The rapid implementation method of wavelet inverse transform provided by the present invention is mainly proposed for the wavelet inverse transform with higher processing speed requirement in the image decompression system, such as the 9 / 7 wavelet inverse transform based on lifting format. In the following, the specific implementation steps of the present invention will be described in detail by taking the 9 / 7 wavelet inverse transform as an example. But obviously, the method provided by the present invention can also be used for other types of wavelet inverse transforms based on lifting formats, and the beneficial effects obtained are also similar. The detailed description is expanded below.

[0037] see figure 1 As shown in the image decompression flow chart, the image decompression includes the following steps:

[0038] S...

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Abstract

The invention relates to a lifting scheme-based 9 / 7 wavelet inverse transformation image decompressing method, which comprises the following steps that: four wavelet coefficient data can be inputted to be processed during every clock cycle, and the processing capacity is improved by adding a parallel operational structure; by temporarily storing and scheduling an intermediate result, the repeatedcomputation can be reduced; an input port of the operational structure in which the symmetric data is arranged is directly joined, so a special symmetric boundary continuation processing procedure can be eliminated, and the delay of the entire flow process can be reduced; and finally four processing results can be outputted during every clock cycle, so the processing capacity and the processing efficiency of the method can be adequately reflected. The method is suitable for a large data size real-time decompression system.

Description

technical field [0001] The present invention relates to an image decompression method based on the 9 / 7 wavelet inverse transform of the lifting format, in particular to an image decompression method based on the lifting format, by adding a parallel computing structure, scheduling intermediate results through temporary access, and simplifying the boundary extension operation. The invention discloses a method for realizing image decompression by 9 / 7 wavelet inverse transform with improved processing speed, belonging to the technical field of image decompression. Background technique [0002] Wavelet transform has a wide range of applications in the fields of signal analysis and digital image processing because of its unique time-frequency localization characteristics. Especially in the field of image compression, the wavelet-based compression method has a high compression ratio, can keep the characteristics of the signal and image unchanged after compression, and can resist in...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04N7/26H04N7/30H04N19/42
Inventor 李波钟祥宜姜宏旭
Owner BEIHANG UNIV