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Home Aerospace & Aeronautics Technique for digital space images quality restoration by inverse filtering

Technique for digital space images quality restoration by inverse filtering

Description

The lot of remote sensing satellite systems produces and transmits to the Earth the various digital space images for the nature sources control and monitoring.

However some spatial (geometrical) distortions are inherent to images from the remote sensing opto-electronic scanners. They are conditioned by, in particular, errors of navigation angles keeping and by impossibility of precise synchronization of CCD photodetectors array readout frequency with speed of a space vehicle orbital movement. A result of such distortions is the reduction of received image quality that brings to complicating the topographic mapping and obstruct the image interpretation.

The purpose of this technology is the quality restoration of the digital space images registered onboard space vehicles of remote sensing system. The algorithms of space image processing are offered. These algorithms allow to measure modulation transfer function (MTF) directly on digital image fragment. The correction of spatially-dependent distortions, such as forward motion blur, accomplished by method of an inverse filtering. The technique for automatic estimation of a digital space image MTF crosssection along arbitrary direction using current scene digital image fragment is proposed. Also construction procedure of the appropriate inverse operator for image restoration is designed.

Innovative Aspect and Main Advantages

The advantage in comparison with known technologies consists of better edge functions finding, full automation of process and capability of digital images restoration in real time.

Areas of Application

Targeted industry sector is aerospace digital images processing and its quality evaluation, remote sensing software development.


Fig. 1 Example of digital space image restoration by inverse filtering

Stage of Development

The examples of experimental researches results on digital correction of space images distortions that induced by satellite forward motion are described.

Contact Details

Contact persons: Popov M.A., Stankevich S.A.
Name of organization: Scientific Centre for Aerospace Research of the Earth
Address: 55-B, Oles Gonchar str., Kiev, 01601, Ukraine
Phone/Fax (+38044) 482-01-66,
E-mail: This e-mail address is being protected from spambots. You need JavaScript enabled to view it

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