Wavelet MTF compensation method based on optimal core shape

A compensation method, the best technology, applied in image data processing, instrumentation, calculation, etc., can solve the problem of signal and noise amplification at the same time, and achieve the effect of high improvement multiple, improved on-orbit dynamic MTF, and lossless information

Inactive Publication Date: 2011-05-04
BEIJING RES INST OF SPATIAL MECHANICAL & ELECTRICAL TECH
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Problems solved by technology

[0006] The technical problem of the present invention is: overcome the deficiencies in the prior art, provide a kind of wavelet MTF compensation method based on optimal kernel shape, this method passes wavelet domain threshold value Distinguish between prior noise and wavelet domain MTFC processing, which solves the problem of simultaneous amplification of signal and noise

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  • Wavelet MTF compensation method based on optimal core shape
  • Wavelet MTF compensation method based on optimal core shape
  • Wavelet MTF compensation method based on optimal core shape

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Embodiment Construction

[0025] The specific embodiment of the present invention is described in further detail below in conjunction with accompanying drawing:

[0026] Such as figure 1 As shown, a wavelet MTF compensation method based on the optimal kernel shape can be applied to the ground processing system of satellite remote sensing images. According to the prior knowledge of the noise of the imaging system, the threshold is input, and the partial separation of the input digital image signal and the noise is realized in the wavelet domain. Input a and b parameters, carry out initial kernel design, carry out wavelet domain MTFC processing on the signal part, after adding the noise part, carry out wavelet domain regularization processing, and output the process image. By continuously adjusting the a and b parameters, different kernels and corresponding different process images are generated, and the corresponding JND and MTF are measured through the process images. Record the a and b parameters th...

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Abstract

The invention discloses a wavelet modulation transfer function (MTF) compensation method based on the optimal core shape, and can be applied to a ground processing system for satellite remote sensing images. The method comprises the following steps of: according to priori knowledge of noise of an imaging system, inputting a threshold value, and partially separating input digital image signals and noise in a wavelet domain; inputting parameters a and b for initial core design, performing wavelet domain modulation transfer function compensation (MTFC) processing on the signal part, adding with the noise part, performing wavelet domain normalizatioin processing and outputting process images; continuously regulating the parameters a and b, generating different cores and corresponding different process images, and measuring corresponding just noticeable difference (JND) and MTF through the process images; and recording the parameters a and b which meet the requirement, and using the parameters a and b as the optimal core parameters of the imaging system. The invention can improve the MTF for the imaging system with low ontrack dynamic MTF, improve the quality grade of the images, and improve system performance.

Description

technical field [0001] The invention relates to the field of aerospace optical remote sensing imaging and ground processing systems, in particular to a wavelet MTF compensation method based on an optimal kernel shape to improve image quality. Background technique [0002] The following table is an explanation of the English abbreviations used in the present invention: [0003] abbreviation English name Chinese name DN Digital Number digital quantity JND Just noticeable difference least noticeable difference MTF Modulation Transfer Function modulation transfer function MTFC Modulation Transfer Function Compensation MTF compensation NASA National Aeronautics and Space Administration nasa [0004] In the development of optical remote sensing imaging systems, users often restrict the parameters of the imaging system. The most commonly used is the index requirement of the on-orbit d...

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Application Information

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IPC IPC(8): G06T5/00G06T5/50
Inventor 姜伟陈世平黄巧林高卫军何红艳齐文雯蔺宇辉赵野
Owner BEIJING RES INST OF SPATIAL MECHANICAL & ELECTRICAL TECH
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