Application of Fuzzy Logic on Astronomical Images Focus Measure

Focus accuracy is an essential factor that affects the astronomical observations quality. The accurate measure of celestial objects properties depends on focus. Automatic focusing is necessary for astronomical observations imaging systems. This paper presents a modified focus measure operator. It also proposes the use of fuzzy logic, to transform images, because of its tolerant of imprecise and incomplete data. The focus operators are applied into two sequences of star clusters observations. The experimental results show that the suggested measure overall score exceeds the previous operators.