دراسة التباین القطري والإحصائي لوضوحیة الصورة النصیة لسبورة داخل قاعة دراسیة تحت شروط إضاءة غیر منتظمة

Abstract

The good and homogenous lighting is important in resolution image and obtaining high contrast in visual image. In this research, three texts have written on Wight board and they were picturing by digital camera on different distances between the text and digital camera depends on fluorescent lighting using Sobol Operator image to obtain edges for three image text image. The mean (statistical and diagonal) contrast has been determined to the text image in edges area. The research notes that the mean (statistical and diagonal) contrast of text images decreases with increases the distance between the camera and the board.