Two Digital Filtering Methods and the Spiral Structure of the M 31 Galaxy
Image enhancement techniques are capable of greatly improving the image quality. Many methods have been envolved to diminish the noise by smoothing or some kind of low-frequency filtering, and there are a number of restoration methods by high-frequency filtering (Bijaoui, 1979). In this paper we shall examine two both simple and useful methods and some of their applications. For our purposes we used a Joyce Loebl microaensitometer and a PDP 11–34 computer of the Rozhen National Astronomical Observatory (Kovachev et al., 1984). The methods described are included in our image processing software (Georgiev, 1986).
KeywordsSpiral Structure Residual Image Image Enhancement Technique Small Inclination Angle Foreground Star
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