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Tremor image deblurring method of satellite platform based on tremor image movement trajectory

A satellite platform and deblurring technology, applied in image enhancement, image data processing, instruments, etc., can solve the problems of difficult image degradation and restoration, failure to fully consider the tremor track of the platform, etc., and achieve the effect of improving image quality

Active Publication Date: 2019-09-10
WUHAN UNIV
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Problems solved by technology

The traditional deblurring method mostly simplifies the motion within the line integration time to a uniform linear motion, which fails to fully consider the tremor track of the platform during imaging, and it is difficult to restore the image degradation caused by the tremor of the complex platform

Method used

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  • Tremor image deblurring method of satellite platform based on tremor image movement trajectory

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Embodiment Construction

[0029] The technical solutions of the present invention will be further described below in conjunction with the accompanying drawings and embodiments.

[0030] This specific embodiment is aimed at the TDI CCD image, and performs targeted deblurring processing on the tremor image of the satellite platform, and the specific steps are as follows:

[0031] Step 1, calculate the integration start and end time corresponding to each row of the image, and extract the imaging image movement trajectory within this time period;

[0032] This step further comprises the following sub-steps:

[0033] Step 1.1, determine the integration start and end time corresponding to each line of the image, assuming that the single-stage integration time is T, then the integration time corresponding to the Lth line of the image is (L-1)T~LT.

[0034] Step 1.2, extracting the imaging image motion in the push-broom direction and the vertical push-broom direction within the time period.

[0035] Among th...

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Abstract

The invention provides a satellite platform tremor image defuzzification method based on tremor image motion tracks. The method comprises the steps of: calculating integration start and end times corresponding to each row of an image, and extracting the image motion track in an imaging process of each row of the image; calculating maximum values of image motion in a push-broom direction and a vertical push-broom direction and a row integration time, thus determining a size of a fuzzy kernel (PSF), and initializing the PSF; carrying out interval division on the row integration time of the to-be-processed row, acquiring a relative position offset between an ideal imaging center and an actual imaging center at each discrete moment, and thus carrying out discretization, superposition counting and normalization of the PSF; and determining to-be-recovered image blocks row by row to restore the image row by row. The method is suitable for use in defuzzification processing of the TDI (Time Delayed and Integration) CCD tremor image, makes full use of platform tremor information during TDI CCD imaging to accurately estimate degenerate fuzzy kernels of the image, and then improves the quality of a restored image.

Description

technical field [0001] The invention belongs to the field of remote sensing image processing and analysis, and relates to a method for deblurring tremor images of a satellite platform. Background technique [0002] TDI (Time Delayed and Integration) CCD is a linear array CCD that works with time-delayed integration technology, developed from the concept of increasing light energy by exposing the same target multiple times. Due to its great advantages in imaging in dark field, it has become the mainstream sensor in the current high-resolution optical remote sensor imaging system. The normal operation of TDI CCD is based on the premise that the transfer speed of photogenerated charge packets is completely synchronized with the transfer speed of the image on the focal plane. If there is platform tremor during the imaging process, the image will be blurred and the imaging quality will be affected. [0003] Under the influence of platform tremor, in the integration process of e...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G06T5/00G06T5/20
CPCG06T5/20G06T2207/10032G06T2207/30241G06T5/73
Inventor 潘俊宋晓林
Owner WUHAN UNIV
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