Geometrical lightness effect on color text resolution in whiteboard in the classroom

The regularity of light distribution in the classroom has the significant role of representation of student visual. That the purpose of lighting the classroom using the light bulbs in addition to natural light (sun) falling out of windows is to provide an additional level sufficient for vision of texts written on the whiteboard. In this study, we went to the expense of statistics is a function of distance is different from the corner of the board of three different tracks (the first track from side of the window and the second track of the from the middle and of the third track from side of the door) in the classroom the existence of electric lighting with natural lighting. We studied the image homogeneous regions is based on the cutback of the homogeneous regions from background of the board and regions of the cutback from the texts of the four. The results showed that The black color use in the writing give good results in visibility of the text written on the whiteboard at the various locations of the hall, and the best track for visibility colored text on the side of the window from the hall. and this has been demonstrated in a simulation between the camera and computer in accordance with the mathematical equations that describe the situation.