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MTFC remote sensing image restoration method

A remote sensing image and MTF technology, applied in the field of image restoration, can solve the problems of not having universal applicability, not being able to use batch automatic production, etc., to achieve the effect of improving clarity, satisfying processing speed, and enhancing texture details

Active Publication Date: 2009-05-27
CHINA CENT FOR RESOURCES SATELLITE DATA & APPL
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Problems solved by technology

[0043] It can be seen that although the restoration algorithm based on the point spread function PSF has the advantage of fast restoration speed, the acquisition of the point spread function PSF is extracted from the image feature target, and the image PSF in different regions will inevitably have great differences. The PSF measured in this region Not necessarily applicable in another region and therefore not of general applicability and cannot be used for mass automatic production

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Embodiment Construction

[0084] see Figure 5 to Figure 12 .

[0085] The technical solutions of the present invention will be further described below in conjunction with the accompanying drawings and specific embodiments.

[0086] Algorithm of the present invention, its technical scheme fitting detailed steps are as follows:

[0087] On the basis of the existing technology, the value of its Nyquist frequency is reset to about 0.55, the purpose is not to bring a lot of noise, the detailed parameter tables 2 and 3 respectively represent the discreteness of a traditional CCD camera laboratory MTF value and CCD camera laboratory discrete MTF value;

[0088] Table 2

[0089] f (frequency) lp / mm MTF 离散点 0 1 5.68 0.89 12.8 0.71 14.9 0.68 19.25 0.54 38.5 (Nyquist frequency

Rate)

0.26

[0090] table 3

[0091] f (frequency) lp / mm MTF 离散点 0 1 5.68 0.89 12.8 0.71 14.9 0.68 19.25 0.54 38.5 (Nyquist frequenc...

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Abstract

The invention discloses a method for restoring an MTFC remote sensing image, in particular an improved MTFC algorithm, and provides a rapid MTFC algorithm which combines a restoration algorithm based on a point spread function PSF. In a mode of constructing an MTF curve through the method, the downtrend of the MTF curve is adjusted through index; an MTF value in nyquist frequency is raised to about 0.5 so as to ensure that no large noise is brought; the rapid MTFC algorithm combines the advantages of the MTFC algorithm and the PSF restoration algorithm based on the point spread function PSF; the MTF curve is constructed through the MTFC algorithm; the point spread function PSF is estimated; the PSF algorithm is used to realize restoration; and the difference between the rapid algorithm and the restoration algorithm based on the point spread function PSF lies in the establishment of the PSF. The aim of the method is to improve definition of the image, strengthen the texture detail of the image, improve the quality of the image and increase no noise at the same time; and the processing speed and the processing effect can meet the requirement of batch production.

Description

technical field [0001] The invention relates to an image restoration method, in particular to an MTFC remote sensing image restoration method. Background technique [0002] Table 1 is the description of the abbreviations used in the present invention: [0003] Table 1 [0004] abbreviation Chinese name English name CCD charge coupled device Charge Coupled Device HR high resolution High Resolution FFT Fast Fourier Transform Fast Fourier Transform IFFT Inverse Fast Fourier Transform Change Inverse Fast Fourier Transform MTF modulation transfer function Modulation Transfer Function MTFC Modulation Transfer Function Complement compensate Modulation Transfer Function Compensation LSF line spread function Line Spread Function PSF point spread function Point Spread Function PSFC Point Spread Function Compensation Point Spread Function Compensation ...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06T5/00G01S17/89
Inventor 郭建宁曾湧朱晓波
Owner CHINA CENT FOR RESOURCES SATELLITE DATA & APPL
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