This dissertation deals with the problem of enabling precise and real-time retrieval of generic 3D models. We focus on three subproblems, namely, rotation normalization, discriminative shape representations and relevance feedback-based retrieval. Considering the first problem, we develop a rotation normalization method that computes the object’s principal axes using the orientation of the objec...

one of the most common positioning errors in panoramic radiography is palatoglossal air space above the apices of the root of maxillary teeth. it causes a radiolucency obscuring the apices of maxillary teeth. in the case of this positioning error, the imaging should be repeated. this causes the patient be exposed to radiation again. to avoid the repetition of exposing harmful x-rays to the pati...

To reconstruct an environment under 360 degrees with a great accuracy and true color represents an important challenge for motion pictures and multimedia applications. This paper describes a new stereoscopic panoramic sensor to achieve this task. Unlike the existing sensors, it uses four acquisition channels coupled with an additional structured light projector to obtain an accurate 3 0 panoram...

Introduction: Dental caries is the most common chronic condition in children. Recently, there has been a growing tendency to using digital panoramic radiography among clinicians. The present study aimed to determine the accuracy of digital panoramic radiography with and without software enhancement in the diagnosis of proximal dental caries in primary molars. Methods: This study was conducted u...

PURPOSE This study evaluated the association between cone beam computed tomography (CBCT) and panoramic radiographs in the assessment of a superimposed relationship between the mandibular canal and impacted third molars. MATERIALS AND METHODS The study samples consisted of 175 impacted third molars from 131 patients who showed a superimposed relationship between the mandibular canal and third...

BACKGROUND The gonial angle is one of the most important measurements required for orthodontic treatment and orthognathic surgery. It is difficult to determine the accurate measurement of each gonial angle on cephalometric radiographs because of superimposition of the left and right angles. OBJECTIVES The aim of the present study was to determine the right and left gonial angles on panoramic ...

abstract background and aim: considering the widespread development of implants in dental treatment plans, linear measurements on panoramic radiography are of especial importance. in the present study we investigated the effect of head misalignment up to 15° around vertical and horizontal axes on the magnification rate of digital panoramic radiography in each part of upper and lower jaws. mater...

Semantic augmentation of 3D point clouds is a challenging problem with numerous real-world applications. While deep learning has revolutionised image segmentation and classification, its impact on cloud an active research field. In this paper, we propose instance using architectures. We show the potential indirect approach 2D images Mask R-CNN (Region-Based Convolution Neural Network). Our meth...