| Summary: | 碩士 === 國立中興大學 === 資訊科學與工程學系所 === 99 === Teeth isolation is a very important pre-processing step of computer-aided dental diagnosis system and dental biometric system. The accuracy of the teeth isolation will directly affect the accuracy of feature extraction and thereby affecting the results of computer-aided diagnosis and the results of identity recognition. Therefore, we propose an effective teeth isolation method for dental X-ray images. In the first step we use the horizontal integral projection information to separate the upper and lower jaws. In the second step, we use the vertical integral projection with the dynamic window method and interdental papilla information to separate the individual teeth. The third step is to use the first derivative information of the vertical integral projection to find the location of missing teeth, and detect teeth occlusion/overlapping segments from the donoised image by bottom-hat operations. The experimental results show that our method, when compared to previous methods, gives better teeth isolation results, especially for image of uneven exposure or with large areas of dental work.
|
|---|
