The significance of identifying early non-cavitated carious lesions and monitoring the lesion extent has led to increasing prospects for prevention, early diagnosis, and implementation of conservative treatments for the accurate parameters of human teeth. The Harris algorithm was evaluated to measure the ability of different methods for measuring the parameters of teeth and in order to detect the corners of the teeth image, which were acquired by intra oral camera for oral cavity. The corner detector techniques is used with morphology open operation and median filtering and then segment the image by the threshold based on the gray value of the image.