A method for compensating for modulation transfer function of high-resolution satellite images

A modulation transfer function, satellite image technology, applied in image data processing, image enhancement, image analysis and other directions, can solve the problem of image signal-to-noise ratio decline, low quality of restored image, high computational complexity, shortening computing time, guaranteeing Accuracy and the effect of improving computational efficiency

Active Publication Date: 2018-12-18
CHANGGUANG SATELLITE TECH CO LTD
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Problems solved by technology

[0005] The present invention provides a high-resolution satellite image modulation transfer function compensation method to solve the problems that the existing image compensation method caus

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  • A method for compensating for modulation transfer function of high-resolution satellite images
  • A method for compensating for modulation transfer function of high-resolution satellite images
  • A method for compensating for modulation transfer function of high-resolution satellite images

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specific Embodiment approach 1

[0027] Specific implementation mode 1. Combination Figure 1 to Figure 8 Description of this embodiment, a high-resolution satellite image modulation transfer function compensation method, the method is implemented by the following steps:

[0028] Step 1. Calculate the point spread function of edge method, the specific process is:

[0029] Step 11. Select the edge area of ​​the selected image, and calculate the size of the selected edge area and the contrast on both sides of the edge image, and determine whether the area meets the conditions according to the calculation result. If so, perform steps 1 and 2; if No, it's over.

[0030] The qualified criteria for the edge area are: the edge area is greater than 20*20, and the contrast ratio on both sides of the edge image is greater than 20%;

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Abstract

A method for compensating for modulation transfer function of high-resolution satellite images is provided, which relates to the design of MTFC (Modulation Transfer Function Compensation) processing method for domestic high resolution satellite images. The invention solves the problems that the prior image compensation method leads to the degradation of the image signal-to-noise ratio, the noise amplification, the low quality of the restored image, and the high computational complexity in the restoration process. The invention improves from two stages of the point spread function calculation and the image deconvolution restoration. Compared with the traditional pixel-level edge detection method, the precision of sub-pixel edge detection is higher. The high precision can ensure the accuracyof the subsequent edge spread function, line spread function and even the final point spread function. In the process of image deconvolution restoration, for the GPU and multithreaded optimization ofthe maximum likelihood iterative deconvolution algorithm, the windowing radius is calculated according to the point spread function radius, and the ultra-high resolution remote sensing image is windowed and divided into blocks, which effectively removes the influence of boundary ringing and further improves the computational efficiency.

Description

technical field [0001] The invention relates to the design of a domestic high-resolution satellite image MTFC (modulation transfer function compensation) processing method, in particular to a high-resolution satellite image modulation transfer function compensation method based on an improved inclined edge method. Background technique [0002] During the imaging process of remote sensing images, affected by factors such as the atmospheric environment, optical system, detectors, platform movement, and circuits, the image will be degraded, the image will be blurred, and the image quality of the image will be reduced. Image restoration is to remove or reduce the The image quality degradation that occurs makes the image tend to be an ideal image without degradation. Most of the current image restoration methods are based on the point spread function, and there may be many reasons for image degradation, such as the nonlinearity of the photoelectric sensor, the relative motion bet...

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Application Information

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IPC IPC(8): G06T3/40G06T5/00G06T7/13
CPCG06T3/4023G06T3/4084G06T5/002G06T7/13G06T2207/20056G06T2207/20021
Inventor 张鹏高放钟兴安源朱瑞飞翟雨微王春月李竺强
Owner CHANGGUANG SATELLITE TECH CO LTD
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