Surface reconstruction via Helmholtz reciprocity with a single image pair

2003 ◽  
Author(s):  
P. Tu ◽  
P.R.S. Mendonca
Keyword(s):  
Surface Reconstruction ◽  
Image Pair ◽  
Single Image

Stereophotogrammetry of Oceanic Clouds

2014 ◽  
Vol 31 (7) ◽  
pp. 1482-1501 ◽  
Author(s):  
Rusen Öktem ◽  
Prabhat ◽  
James Lee ◽  
Aaron Thomas ◽  
Paquita Zuidema ◽  
...  
Keyword(s):  
Camera Calibration ◽  
Cloud Base ◽  
Biscayne Bay ◽  
Digital Cameras ◽  
Image Pair ◽  
Single Image ◽  
Calibration Technique ◽  
Launch Site ◽  
Stereo Cameras ◽  
Stereo Reconstruction

This study extends ground-based stereophotogrammetry of clouds to oceanic settings, where there are often none of the landmarks used in traditional camera calibration. This paper introduces a zero-landmark calibration technique and tests it with two off-the-shelf digital cameras situated about 1 km apart facing Biscayne Bay in Miami, Florida. The precision of the stereo reconstruction is studied theoretically, and the accuracy of the reconstructions is validated against lidar and radiosondes. The stereo cameras are able to accurately reconstruct a histogram of cloud-base heights from a single-image pair, a task that requires tens of minutes of observation from a cloud lidar. The stereo cameras are also able to accurately reconstruct horizontal winds in cloud layers with a temporal resolution in the range of 30 s to 5 min, compared to once every 12 h for a typical radiosonde launch site.

Mirror Surface Reconstruction from a Single Image

2015 ◽  
Vol 37 (4) ◽  
pp. 760-773 ◽  
Author(s):  
Miaomiao Liu ◽  
Richard Hartley ◽  
Mathieu Salzmann
Keyword(s):  
Surface Reconstruction ◽  
Mirror Surface ◽  
Single Image

scholarly journals The Reconstruction of the Object Surface using Confocal Microscope with Hyperchromatic Lens

MENDEL ◽  
2018 ◽  
Vol 24 (1) ◽  
pp. 129-134
Author(s):  
Pavel Starha ◽  
Jana Prochazkova ◽  
Dalibor Martisek
Keyword(s):  
Nonlinear Optimization ◽  
Surface Reconstruction ◽  
Light Microscope ◽  
Confocal Microscope ◽  
Single Image ◽  
Object Surface ◽  
Reflected Light

The usage of a tandem-scanning reflected-light microscope is not common but this technology offers the wide possibilities in the area of the surface reconstruction. This article presents a method that can reconstruct the 3D relief from a single image with a known calibrated set of images. The method uses the property that the points in the same height are visualized in the same color and we propose the nonlinear optimization to find this dependence. Subsequently, the low brightness parts are added by circular partial convolution.

scholarly journals Structural Analogy from a Single Image Pair

2020 ◽  
Author(s):  
S. Benaim ◽  
R. Mokady ◽  
A. Bermano ◽  
L. Wolf
Keyword(s):  
Image Pair ◽  
Single Image ◽  
Structural Analogy

Sonography of subcutaneous tissue cannot determine causes of lower limb edema

VASA ◽  
2015 ◽  
Vol 44 (2) ◽  
pp. 122-128 ◽  
Author(s):  
Mandy Becker ◽  
Tom Schilling ◽  
Olga von Beckerath ◽  
Knut Kröger
Keyword(s):  
Clinical Diagnosis ◽  
Lower Limb ◽  
Subcutaneous Tissue ◽  
Hepatic Disease ◽  
Clinical Use ◽  
Single Image ◽  
Heart Insufficiency ◽  
Chronic Hepatic Disease ◽  
Limb Edema ◽  
Venous Disorders

Background: To clarify the clinical use of sonography for differentiation of edema we tried to answer the question whether a group of doctors can differentiate lymphedema from cardiac, hepatic or venous edema just by analysing sonographic images of the edema. Patients and methods: 38 (70 ± 12 years, 22 (58 %) females) patients with lower limb edema were recruited according the clinical diagnosis: 10 (26 %) lymphedema, 16 (42 %) heart insufficiency, 6 (16 %) venous disorders, 6 (16 %) chronic hepatic disease. Edema was depicted sonographically at the most affected leg in a standardised way at distal and proximal calf. 38 sets of images were anonymised and send to 5 experienced doctors. They were asked whether they can see criteria for lymphedema: 1. anechoic gaps, 2. horizontal gaps and 3. echoic rims. Results: Accepting an edema as lymphedema if only one doctor sees at least one of the three criteria for lymphatic edema on each single image all edema would be classified as lymphatic. Accepting lymphedema only if all doctors see at least one of the three criteria on the distal image of the same patient 80 % of the patients supposed to have lymphedema are classified as such, but also the majority of cardiac, venous and hepatic edema. Accepting lymphedema only if all doctors see all three criteria on the distal image of the same patients no edema would be classified as lymphatic. In addition we separated patients by Stemmers’ sign in those with positive and negative sign. The interpretation of the images was not different between both groups. Conclusions: Our analysis shows that it is not possible to differentiate lymphedema from other lower limb edema sonographically.

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