Cylinder radius determination of cylindrical panoramic image mosaic

2015 ◽  
Author(s):  
Xiaolong Ni ◽  
Zhengning Wang ◽  
Yan Jiang
Keyword(s):  
Image Mosaic ◽  
Panoramic Image ◽  
Cylinder Radius

Parameter Study of Offset Press Cylinder Based on Sliding Friction

2010 ◽  
Vol 174 ◽  
pp. 299-302 ◽  
Author(s):  
Hai Yan Zhang ◽  
He Ping Hou ◽  
Jun Feng Si ◽  
Xiao Yu Chen
Keyword(s):  
Contact Area ◽  
Sliding Friction ◽  
Accurate Determination ◽  
Rolling Process ◽  
Elastic Cylinder ◽  
Parameter Study ◽  
Cylinder Radius ◽  
Printing Quality ◽  
Dot Gain

In the contact area of offset, a relative slide occurs between the surface of plate cylinder and blanket cylinder, which changes the print image and influences the printing quality. The relative slide in the cylinders’ rolling process is investigated, and the determination rule of cylinders’ geometric parameters of offset press is proposed. The results show that the relative slide is minimization under the condition that the compression of elastic cylinder radius is 0.2 times bigger than that of rigid cylinder radius, and the deformation of print image and dot gain both are minimization. The results provide theoretical direction for accurate determination of cylinder radius of offset press.

Panoramic Image System Design in the Nearly Dark Environment

2013 ◽  
Vol 464 ◽  
pp. 304-309 ◽  
Author(s):  
Geng Chen ◽  
Qing Li ◽  
Hao Zhang
Keyword(s):  
Principal Component Analysis ◽  
Imaging System ◽  
Principal Component ◽  
Image Mosaic ◽  
Panoramic Image ◽  
Image System ◽  
Fusion Algorithm ◽  
Canny Operator ◽  
Image Edge ◽  
Wireless Module

Aiming at the need of borehole and ruins exploration in the nearly dark environment, a Panoramic Image System is proposed in this paper. consisting of a reciprocating motor, a steering gear with complete rotation, a miniature camera, a depth transducer and radio frequency wireless module. The camera was pushed to the specified location of the pipe by the motor and then the steering gear was rotated for panorama image acquisition. In order to achieve a seamless panoramic image without distortion, a fusion algorithm based on Principal Component Analysis (PCA) and an image mosaic algorithm for image edge extracting based on Canny operator were proposed. The imaging system has good usability and applicability.

Panoramic Image Mosaic Method For Rotary Scanning Serial ImageWang Huifeng

2009 ◽  
Vol 29 (5) ◽  
pp. 1211-1215 ◽  
Author(s):  
Liu Shangqian ◽  
Wang Dabao ◽  
Lu Quan
Keyword(s):  
Image Mosaic ◽  
Panoramic Image

scholarly journals Comparison of Mesiodistal Root Angulation Measured from Conventional and CBCT Derived Panoramic Radiographs in Orthodontic Patients

2017 ◽  
Vol 11 (1) ◽  
pp. 338-349 ◽  
Author(s):  
Ibrahim Nasseh ◽  
Douglas Jensen ◽  
Marcel Noujeim
Keyword(s):  
Horizontal Plane ◽  
Head Tilt ◽  
Cone Beam ◽  
Occlusal Plane ◽  
Panoramic Image ◽  
Plane Angle ◽  
Panoramic Radiographs ◽  
Orthodontic Patients ◽  
Frankfort Horizontal Plane

Introduction: Use of cone beam computed tomography (CBCT) in orthodontics is increasing; however, some patients started treatment with conventional images. The objective of this study is to manipulate CBCT panoramic reconstruction to make it comparable to conventional panoramic image and to compare mesiodistal root angulations on both images. Materials and Methods: Concurrent conventional panoramics and CBCT volumes were obtained from 40 subjects. CBCT volumes were manipulated to generate pan-like images that mimic the occlusal plane angle of the corresponding panoramic, allowing comparison of mesiodistal root angulations and determination of the head-tilt required to produce the reconstruction. Results: Clinically meaningful differences (p < .05) in the mesiodistal root angulations between standard panoramics and CBCT reconstructions emerged for 13 out of 24 teeth (54%). Greatest variations were seen in the maxillary and mandibular sextants and in first molar regions. Ideal axial head-tilt for image acquisition was determined to be with Frankfort horizontal plane 3.3o nose down. Conclusion: CBCT pan images must be used with caution due to variation between methods in specific areas of arches. The images can be useful for the assessment of mesiodistal root angulations if the volume is properly manipulated to create a pan-like image.

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