期刊名称：International Journal of Innovative Research in Science, Engineering and Technology
印刷版ISSN：2347-6710
电子版ISSN：2319-8753
出版年度：2013
卷号：2
期号：4
页码：1099
出版社：S&S Publications
摘要：The coherent edge-response of aberrated optical systems apodised with amplitude filters hasbeen studied theoretically. The two most common problems encountered in the coherent-imagingtechniques are speckling and edge-ringing. The pronounced effects of edge-ringing associated withcoherent images of straight edges can be considerably reduced using variable apodisation technique. Itis found that this type of apodisation is more effective not only in trimming the ringing-effect and alsoimproves another image quality assessment factor edge gradient perceptibly which improves the edgeimages under the influence of defocus and primary coma. Studies on this subject indicate theimportance of coherent imagery in areas like spatial filtering technique and microscopy.
