Currently, the OpenCV function library is being used and becoming more common and used in digital images Processing to solve some image processing problems which can improve image processing efficiency. it is a computer vision method that helps to find and visualize the faces in digital images view. This method is a special use in the case for object detection methods that process instances of semantic objects that detect certain classes (for example, people, buildings, or cars, etc.) in digital images and video. this technology plays an important role in Improve the recognition rate of face recognition systems in noise environment and curse Communicate with others. In this research paper, we discussed the use of face detection method in classrooms for attendance as well as for safety, security reasons and method of the detection faces which can adopt the relative positions of every specific face present in the classroom. The experiments show that this method can quickly and efficiently extract the face region, and improve the face segmentation precisely.