A high resolution camera system (ParCa) for imaging particles in the ocean: System design and results from profiles and a three-month deployment

1996 ◽  
Vol 54 (3) ◽  
pp. 589-603 ◽  
Author(s):  
Volker Ratmeyer ◽  
Gerold Wefer
Keyword(s):  
High Resolution ◽  
System Design ◽  
Camera System

scholarly journals Recoverable autonomous sonde for subglacial lake exploration: electronic control system design

2021 ◽  
pp. 1-17
Author(s):  
Shilin Peng ◽  
Xiao Jiang ◽  
Yongzhen Tang ◽  
Chong Li ◽  
Xiaodong Li ◽  
...  
Keyword(s):  
Control System ◽  
System Design ◽  
Video Recording ◽  
Control System Design ◽  
Electronic Control ◽  
High Definition ◽  
Water Conductivity ◽  
Camera System ◽  
Subglacial Lake ◽  
Electronic Control System

Abstract Subglacial lake exploration is of great interest to the science community. RECoverable Autonomous Sonde (RECAS) provides an exploration tool to measure and sample subglacial lake environments while the subglacial lake remains isolated from the glacier surface and atmosphere. This paper presents an electronic control system design of 200 m prototype of RECAS. The proposed electronic control system consists of a surface system, a downhole control system, and a power transfer and communication system. The downhole control system is the core element of RECAS, and is responsible for sonde status monitoring, sonde motion control, subglacial water sampling and in situ analysis. A custom RS485 temperature sensor was developed to cater for the limited size and depth requirements of the system. We adopted a humidity-based measurement to monitor for a housing leak. This condition is because standard leak detection monitoring of water conductivity may be inapplicable to pure ice in Antarctica. A water sampler control board was designed to control the samplers and monitor the on/off state. A high-definition camera system with built-in storage and self-heating ability was designed to perform the video recording in the subglacial lake. The proposed electronic control system is proven effective after a series of tests.

scholarly journals Ice Fog and Light Snow Measurements Using a High-Resolution Camera System

2016 ◽  
Vol 173 (9) ◽  
pp. 3049-3064 ◽  
Author(s):  
Thomas Kuhn ◽  
Ismail Gultepe
Keyword(s):  
High Resolution ◽  
Camera System ◽  
Ice Fog

scholarly journals Assessment of Stereoscopic Multi-resolution Images for a Virtual Reality System

2010 ◽  
Vol 9 (2) ◽  
pp. 31-37 ◽  
Author(s):  
Masahiko Ogawa ◽  
Kazunori Shidoji ◽  
Yuji Matsuki
Keyword(s):  
High Resolution ◽  
Field Of View ◽  
Monitor System ◽  
Wide Angle ◽  
Camera System ◽  
Technical Limitation ◽  
Resolution Image ◽  
The Gaze ◽  
High Resolution Image ◽  
Perceptual Characteristics

A camera and monitor system that projects actual real-world images has yet to be developed due to the technical limitation that the existing cameras cannot simultaneously acquire high-resolution and wide-angle images. In this research, we try to resolve this issue by superimposing images; a method which is effective because the entire wide-angle image does not necessarily need to be of high resolution because of perceptual characteristics of the human visual system. First, we examined the minimum resolution required for the field of view, which indicated that a triple-resolution image where positions more than 20 and 40 deg from the center of the visual field were decreased to 25% and approximately 11% of the resolution of the gaze point, respectively, was perceived as similar to a completely high-resolution image. Next, we investigated whether the participants could distinguish between the original completely high-resolution image and processed images, which included triple-resolution, dual-resolution, and low-resolution images. Our results suggested that the participants could not differentiate between the triple-resolution image and the original image. Finally, we developed a stereoscopic camera system based on our results

scholarly journals A Small Field, High Resolution γ-Camera System dedicated to SPECT Imaging

2020 ◽  
Vol 16 ◽  
pp. 45
Author(s):  
D. Thanasas ◽  
E. Georgiou ◽  
N. Giokaris ◽  
A. Karabarbounis ◽  
D. Maintas ◽  
...  
Keyword(s):  
High Resolution ◽  
Single Photon ◽  
Photon Emission ◽  
Distortion Correction ◽  
Reference Points ◽  
Emission Computed Tomography ◽  
Small Field ◽  
Camera System ◽  
Spatial Distortion ◽  
Correction Technique

A small field, high resolution γ-Camera system dedicated to radiopharmaceutical research and other clinical SPECT (Single Photon Emission Computed Tomography) applications is currently being developed in our group. The system is equipped with the 3” HAMAMATSU R2486 Position Sensitive PhotoMultiplier Tube (PSPMT) with a 16X+16Y-crossed wire anode and various pixelated and ho- mogeneous scintillation crystals. Planar images are created from the recorded charge signals by applying the resistive chain technique. The main part of this work focuses on the development of new correction methods for the improvement of the spatial resolution and the uniformity of the γ-Camera. The spatial distortion correction technique is based on lookup tables with the coordinates of reference points which are selected during the calibration phase of the system for a given set of collimator and scintillation crystal. The applied algorithm incorporates 2D-interpolation tech- niques and has been developed on a full automated graphics environment making use of the HIGZ (High Level Interface to Graphics and ZEBRA) program libraries from CERN. Both correction methods for the spatial distortion and non-uniformity have been applied to phantom images using several combinations of small capillaries filled with water solution of 99mTc. Comparative studies are shown on planar im- ages for different phantom geometries. The method is also extended to tomographic images and the obtained SPECT improvement in resolution is discussed.

scholarly journals Laboratory study of the properties of frazil ice particles and flocs in water of different salinities

2019 ◽  
Vol 13 (10) ◽  
pp. 2751-2769 ◽  
Author(s):  
Christopher C. Schneck ◽  
Tadros R. Ghobrial ◽  
Mark R. Loewen
Keyword(s):  
Growth Rate ◽  
High Resolution ◽  
Saline Water ◽  
Camera System ◽  
Average Growth ◽  
Frazil Ice ◽  
Ice Particles ◽  
Thermodynamic Conditions ◽  
Mean Size ◽  
Log Normal

Abstract. Measurements of the size and shape of frazil ice particles and flocs in saline water and of frazil ice flocs in freshwater are limited. This study consisted of a series of laboratory experiments producing frazil ice at salinities of 0 ‰, 15 ‰, 25 ‰ and 35 ‰ to address this lack of data. The experiments were conducted in a large tank in a cold room with bottom-mounted propellers to create turbulence. A high-resolution camera system was used to capture images of frazil ice particles and flocs passing through cross-polarizing lenses. The high-resolution images of the frazil ice were processed using a computer algorithm to differentiate particles from flocs and determine key properties including size, concentration and volume. The size and volume distributions of particles and flocs at all four salinities were found to fit log-normal distributions closely. The concentration, mean size, and standard deviation of flocs and particles were assessed at different times during the supercooling process to determine how these properties evolve with time. Comparisons were made to determine the effect of salinity on the properties of frazil ice particles and flocs. The overall mean size of frazil ice particles in saline water and freshwater was found to range between 0.52 and 0.45 mm, with particles sizes in freshwater ∼13 % larger than in saline water. However, qualitative observations showed that frazil ice particles in saline water tend to be more irregularly shaped. The overall mean size of flocs in freshwater was 2.57 mm compared to a mean size of 1.47 mm for flocs in saline water. The average growth rate of frazil particles was found to be 0.174, 0.070, 0.033, and 0.024 mm min−1 and the average floc growth rate was 0.408, 0.118, 0.089, and 0.072 mm min−1 for the 0 ‰, 15 ‰, 25 ‰, and 35 ‰, respectively. Estimates for the porosity of frazil ice flocs were made by equating the estimated volume of ice produced based on thermodynamic conditions to the estimated volume of ice determined from the digital images. The estimated porosities of frazil ice flocs were determined to be 0.86, 0.82, 0.8 and 0.75 for 0 ‰, 15 ‰, 25 ‰ and 35 ‰ saline water, respectively.

Dual camera system for acquisition of high resolution images

2007 ◽  
Author(s):  
Jeremie A. Papon ◽  
Randy P. Broussard ◽  
Robert W. Ives
Keyword(s):  
High Resolution ◽  
Camera System ◽  
High Resolution Images
Sign in / Sign up

Export Citation Format

Share Document