The Perspective-N-Point problem (PNP) is a notable problem in computer vision. It consists in, given N points known in an object coordinate space and their projection onto the image, estimating the distance between the video camera and the set of points. By the use of an unusual formulation, we propose a method to get a strictly analytical solution based on the resolution of linear systems. Thi...

AIM To compare digital panoramic images acquired for the presurgical assessment of third molars captured with a storage phosphor-based system with conventional film panoramic radiographs. METHODS AND MATERIALS A total of 51 pairs of digital and conventional panoramic images, made simultaneously, were included in this study. The images were evaluated for diagnostic quality prior to third molar...

The possible complications of wisdom-tooth removal must be considered, because it is the most common surgical intervention in dental practices. This retrospective study assessed the complications occurring during the removal of 1,562 maxillary wisdom teeth in 1,212 patients. A total of 543 cases of surgical removal and 1,019 cases of non-surgical removal were analyzed. In all cases, a pre-opera...

BACKGROUND Orthopantomography (panoramic radiography) has been used for the study of measurements involving particularly the prediction of the eruption of impacted lower third molars and analyses of measurements of the ramus and head of mandible. The discrepancies involved with the projection of this radiographic image has stimulated the search for further ways to use it, particularly in orthod...

The panorama-based annotation method described in this paper uses a panoramic image as the source of information about the positions of the annotations. It nds image alignment parameters between an input frame and the panoramic image and then maps the positions of annotations from the panoramic image to the input frame and displays the input frame overlaid with those annotations. Camera movemen...

Search for information about monuments, business establishments and façades is a recurring task for travelers and citizens of large cities. However, even when the person is in front of the place of interest, the language and the inaccuracy of the GPS receivers integrated in mobile phones may make it difficult the precise identification of the site. We present a tool that is capable to identify ...

We introduce a new class of panoramic images, called polycentric panoramic images, which is a generalization from more specific classes such as single-center, multiple-center, or concentric panoramic images. This paper focuses on the derivation of an epipolar curve equation for polycentric panoramic images. The epipolar curve equation derived provides a unified approach for the epipolar geometr...

As the sensor technology and image processing technology rapidly developped, more and more scholars have paid attention to the panoramic imaging technology. Panoramic imaging technology can be applied to military, medicine, security, etc. Panoramic imaging technology has became an important research topic in the field of computer vision. There are four current methods to obtain panoramic images...

OBJECTIVES The aims of this study were to evaluate the influence of gender and dental status on the mental index, mandibular cortical index and panoramic mandibular index from dental panoramic radiographs in elderly who had osteoporosis or did not have osteoporosis. METHODS Panoramic radiographs of 487 elderly dental patients (age range 60-88 years) were evaluated. It were recorded osteoporot...