IDEA #6IPGOL Technique For Digital Space Images Quality Restoration By Inverse Filtering

AEROSPACE TECHNOLOGIES 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 monitor- ing. However some spatial (geometrical) distortions are inherent to images from the remote sensing opto- electronic scanners. They are conditioned by, in par- ticular, 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 resto- ration of the digital space images registered onboard space vehicles of remote sensing system. The algorithms of space image processing are of- fered. These algorithms allow to measure modula- tion transfer function (MTF) directly on digital im- age fragment. The correction of spatially-dependent distortions, such as forward motion blur, accom- plished by method of an inverse filtering. The tech- nique for automatic estimation of a digital space image MTF cross-section along arbitrary direction using current scene digital image fragment is pro- posed. Also construction procedure of the appropri- ate inverse operator for image restoration is de- signed. Innovative Aspect and Main Advantages The advantage in comparison with known technolo- gies consists of better edge functions finding, full automation of process and capability of digital im- ages 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 in- verse filtering Stage of Development The examples of experimental researches results on digi- tal correction of space images distortions that induced by satellite forward motion are described. Contact Details Popov M.A., Stankevich S.A. Scientific Centre for Aerospace Research of the Earth 55-B, Oles Gonchar str., Kiev, 01601, Ukraine phone/fax (+38044) 482-01-66, e-mail: st@casre.kiev.ua