scholarly journals 3D Reconstruction of the Surface Using a Standard Camera

2017 ◽  
Vol 2017 ◽  
pp. 1-11 ◽  
Author(s):  
Dalibor Martišek
Keyword(s):  
3D Reconstruction ◽  
Ccd Camera ◽  
Confocal Microscope ◽  
Phase Correlation ◽  
Field Of View ◽  
New Method ◽  
Small Field ◽  
Geometrical Transformation ◽  
Small Field Of View

This paper deals with3Dreconstructions of series of partially focussed images. Some of these methods are known in case of images which were acquired in small field of view (by confocal microscope or CCD camera, e.g.). In this case, recorded images do not differ in any geometrical transformation from each other. In case of larger samples (oversized for microscope or CCD camera), it is necessary to use wider viewing field (standard cameras, e.g.), and taken images primarily differ in scaling but may also differ in shifting and rotation too. These images cannot be used for reconstruction directly; they must be registered; that is, we must determine all transformations which the images differ and eliminate their effects. There are several ways to do this. This paper deals with the registration based on phase correlation. After this registration, it is necessary to identify the sharp parts and to compose a2Dand3Dmodel. Present methods are very sensitive to noise and their results are not satisfactory in many cases. We introduce a new method for3Dreconstruction which is significantly better.

scholarly journals Registration of Partially Focused Images for 2D and 3D Reconstruction of Oversized Samples

Scanning ◽  
2017 ◽  
Vol 2017 ◽  
pp. 1-8 ◽  
Author(s):  
Dalibor Martišek ◽  
Hana Druckmüllerová
Keyword(s):  
Fracture Surface ◽  
3D Reconstruction ◽  
Ccd Camera ◽  
Confocal Microscope ◽  
Phase Correlation ◽  
Field Of View ◽  
Small Field ◽  
Geometrical Transformation ◽  
2D And 3D ◽  
Small Field Of View

Methods of fracture surface 3D reconstruction from a series of partially focused images acquired in a small field of view (e.g., by confocal microscope or CCD camera) are well known. In this case, projection rays can be considered parallel and recorded images do not differ in any geometrical transformation from each other. In the case of larger samples (oversized for microscope or CCD camera), it is necessary to use a wider viewing field (e.g., standard cameras); taken images primarily differ in scaling but may also differ in shifting and rotation. These images cannot be used for reconstruction directly; they must be registered; that is, we must determine all transformations in which the images differ and eliminate their effects. There are several ways to do this. This paper deals with the registration based on phase correlation.

Very High Resolution Analysis of the Dynamics of a Coronal Plasmoid

1994 ◽  
Vol 144 ◽  
pp. 593-596
Author(s):  
O. Bouchard ◽  
S. Koutchmy ◽  
L. November ◽  
J.-C. Vial ◽  
J. B. Zirker
Keyword(s):  
High Resolution ◽  
Solar Eclipse ◽  
Total Solar Eclipse ◽  
Field Of View ◽  
Small Field ◽  
High Resolution Analysis ◽  
Ccd Observations ◽  
Resolution Analysis ◽  
Very High ◽  
Small Field Of View

AbstractWe present the results of the analysis of a movie taken over a small field of view in the intermediate corona at a spatial resolution of 0.5“, a temporal resolution of 1 s and a spectral passband of 7 nm. These CCD observations were made at the prime focus of the 3.6 m aperture CFHT telescope during the 1991 total solar eclipse.

Improvement in imaging common temporal bone pathologies at 3 T MRI: small structures benefit from a small field of view

2017 ◽  
Vol 72 (3) ◽  
pp. 267.e1-267.e12 ◽  
Author(s):  
M. Schulze ◽  
K. Reimann ◽  
A. Seeger ◽  
U. Klose ◽  
U. Ernemann ◽  
...  
Keyword(s):  
Temporal Bone ◽  
Field Of View ◽  
Small Field ◽  
Small Field Of View

scholarly journals Study on project trajectory of air-to-ground missile with strapdown seeker under multi constraints

2021 ◽  
Vol 39 (1) ◽  
pp. 141-147
Author(s):  
Junmin Zhao ◽  
Cong Nie ◽  
Guannan Chang ◽  
Meibo Lyu ◽  
Xinguo Li
Keyword(s):  
Good Condition ◽  
Field Of View ◽  
Small Field ◽  
Target Acquisition ◽  
Moving Targets ◽  
Proportional Navigation ◽  
Terminal Stage ◽  
Guidance Law ◽  
Terminal Guidance ◽  
Small Field Of View

The air-to-ground missile with strapdown seeker may have the problems, including small field of view(FOV), limited overload, and fall angle constraint. To solve the above mentioned problem, a phased guidance scheme is proposed. In this scheme, the attack trajectory is divided into the following six stages, including glided stage, fall angle constraint stage, target acquisition and adjustment stage, terminal guidance stage and blind zone stage. The glided stage is designed to increase range, the terminal fall angle is attained ahead of time at fall angle constraint stage. The aim of target acquisition and adjustment stage is to adjust the missile attitude, so that the target will fall within the FOV of the seeker. It creates good condition to capture the target for strapdown seeker. In the terminal stage, the guidance law of proportional navigation and attitude track are used to fit the needs of FOV constraint and attack accuracy. The simulation result shows that the project trajectory can solve the application of attacking moving targets for air-to-ground missile with strapdown seeker under multi constraints.

Transmission Microscopic Moire´ Interferometry for Nanoscale Deformation Measurements

2003 ◽  
Author(s):  
C. W. Han ◽  
S. Cho ◽  
B. Han
Keyword(s):  
Spatial Resolution ◽  
Optical Method ◽  
Moiré Interferometry ◽  
Field Of View ◽  
Moire Interferometry ◽  
Small Field ◽  
Accurate Analysis ◽  
Full Field ◽  
Deformation Measurements ◽  
Small Field Of View

Moire´ interferometry is a full-field optical method that has high displacement, strain and spatial resolution. The method has been used extensively for deformation analyses in the various fields of mechanics. Special considerations arise when deformation measurements of tiny specimens or tiny regions of larger specimens are sought. The relative displacements within a small field of view will be small (even if the strains are not small), so the number of morie´ fringes might not be enough for an accurate analysis.

scholarly journals Assessing a small field of view hybrid gamma camera for perioperative iodine-125 seed localisation

2019 ◽  
pp. 20190020
Author(s):  
Aik Hao Ng ◽  
Mohammed S. Alqahtani ◽  
Layal K. Jambi ◽  
Sarah L. Bugby ◽  
John E. Lees ◽  
...  
Keyword(s):  
Gamma Camera ◽  
Field Of View ◽  
Small Field ◽  
Iodine 125 ◽  
Small Field Of View
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