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Image restoration method based on aerial TDI-CCD (Time Delay and Integration-Charge Coupled Device) imaging error vibration model

A TDI-CCD, image restoration technology, used in image enhancement, image analysis, image data processing, etc., can solve the problems of difficult to improve the accuracy of image restoration and unable to truly describe the imaging state.

Inactive Publication Date: 2010-10-27
BEIJING INSTITUTE OF TECHNOLOGYGY
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Problems solved by technology

[0007] However, the current imaging software compensation method does not establish a connection between the description of the atmospheric environment and the change of the imaging attitude, so it cannot truly describe the imaging state, making it difficult to improve the accuracy of imaging restoration

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  • Image restoration method based on aerial TDI-CCD (Time Delay and Integration-Charge Coupled Device) imaging error vibration model
  • Image restoration method based on aerial TDI-CCD (Time Delay and Integration-Charge Coupled Device) imaging error vibration model
  • Image restoration method based on aerial TDI-CCD (Time Delay and Integration-Charge Coupled Device) imaging error vibration model

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Embodiment Construction

[0038] The present invention will be described in further detail below with reference to the accompanying drawings.

[0039] The invention is designed for software compensation of image effects in an aviation TDI-CCD imaging system with opto-mechanical compensation and electronic compensation.

[0040] The imaging attitude of the aviation TDI-CCD will change with the environment at that time. When the imaging pose changes, imaging errors also occur. In the TDI-CCD imaging system already equipped with opto-mechanical compensation and electronic compensation, the main factor causing the change of imaging attitude is vibration.

[0041] Vibration can be divided into low frequency vibration, high frequency vibration and ultra-high frequency vibration. Low-frequency vibration is the vibration with relatively large amplitude caused by atmospheric turbulence when the aircraft is flying at low altitude, and the form of low-frequency vibration has the most obvious influence on the im...

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Abstract

The invention provides an image restoration method based on an aerial TDI-CCD (Time Delay and Integration-Charge Coupled Device) imaging error vibration model. In the method, vibration frequencies are classified into low-frequency vibration and high-frequency vibration without regard to high-frequency vibration; the low-frequency vibration is taken as random vibration, and a low-frequency vibration model is established; the low-frequency vibration is decomposed into displacements in three direction of X, Y and Z on the basis of the low-frequency vibration model, and displacement expressions in the directions X, Y and Z are established; the high-frequency vibration is taken as the simple harmonic vibration of a set frequency in a set direction, and a high-frequency vibration model is established; and imaging errors generated by displacement changes caused by the low-frequency vibration in each direction are respectively corrected by adopting different image restoration algorithms in each direction when software image restoration is carried out. The method can more reasonably simulate the actual situation of aerial imaging, and the models established by the invention can improve the precision of the TDI-CCD image restoration.

Description

technical field [0001] The invention relates to an aviation TDI-CCD imaging error compensation technology, in particular to a method for establishing an imaging error model based on the analysis of the vibration state of the TDI-CCD imaging of a low-altitude aircraft and the analysis of the TDI-CCD imaging attitude change caused by the vibration, and a method using Image restoration method for the built model. This method is used in the algorithmic compensation process of the image captured by the TDI-CCD after opto-mechanical and electronic compensation, so as to obtain a higher-precision imaging effect. Background technique [0002] Usually, the time-delay-integration charge-coupled device (TDI-CCD) imaging device carried on the aircraft uses three compensation methods: opto-mechanical compensation, electronic compensation and software compensation to compensate the imaging. Among them, the methods of opto-mechanical compensation and electronic compensation are effective,...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06T5/00G06T7/00
Inventor 许廷发梁炯石明珠冯亮倪国强
Owner BEIJING INSTITUTE OF TECHNOLOGYGY
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