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

A charge-coupled device and time-delay integration technology, which is applied in image enhancement, image analysis, image data processing, etc., can solve the problems that the imaging recovery accuracy is difficult to improve, and the imaging state cannot be truly described.

Inactive Publication Date: 2012-09-05
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 in conjunction with the accompanying drawings.

[0039] The invention is designed for the software compensation of the image effect in the aerial TDI-CCD imaging system with optical-mechanical compensation and electronic compensation.

[0040] The imaging attitude of aviation TDI-CCD will change with the environment at that time. When the imaging attitude changes, imaging errors will also occur. In the TDI-CCD imaging system that already has optomechanical 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 a vibration with relatively large amplitude caused by atmospheric turbulence when the aircraft is flying at low altitude, and the low-frequency vibration form has the most obvious impact on imag...

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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 aviation TDI-CCD imaging error compensation technology, in particular to an imaging error model establishment method based on the analysis of the TDI-CCD imaging vibration state of low-altitude aircraft and the analysis of the TDI-CCD imaging attitude changes caused by vibration, and the use of Image restoration method for the built model. This method is used in the algorithmic compensation process of TDI-CCD captured images after optical mechanical and electronic compensation, so as to obtain higher-precision imaging effects. Background technique [0002] Generally, the time-delay-integral charge-coupled device (TDI-CCD) imaging device carried on an aircraft will use three compensation methods: optical-mechanical compensation, electronic compensation and software compensation, to compensate the imaging. Among them, optical mechanical compensation and electronic compensation are effective, but due to the complexity and cost of...

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Application Information

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Patent Type & Authority Patents(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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