Calibration of Timing Parameters of Still Image Cameras and Video Cameras by a Two Dimensional LED Array

2021 ◽  
Vol 13 (2) ◽  
pp. 23-35
Author(s):  
Hau Wah Lai ◽  
Cho Man Tsui
Keyword(s):  
Circuit Design ◽  
Frequency Standard ◽  
Clock Signal ◽  
Two Dimensional ◽  
Calibration Laboratory ◽  
Still Image ◽  
Video Cameras ◽  
Led Array ◽  
Calibration Methods

This paper presents a t wo-dimensional 10 x 10 LED array system developed in-house at t he Standards and Calibration Laboratory (SCL) for the calibration of timing parameters of still image cameras and video cameras. In this paper, the circuit design and the calibration methods for cameras of different shutter types (rolling shutter or global shutter) are presented. This LED array may also be used to verify the shutter type of cameras. The frequency of the clock signal applied in the calibration is traceable to the SI through the cesium beam frequency standard maintained at SCL.

Convertible two-dimensional-three-dimensional display using an LED array based on modified integral imaging

2006 ◽  
Vol 31 (19) ◽  
pp. 2852 ◽  
Author(s):  
Seong-Woo Cho ◽  
Jae-Hyeung Park ◽  
Yunhee Kim ◽  
Heejin Choi ◽  
Joohwan Kim ◽  
...  
Keyword(s):  
Three Dimensional ◽  
Two Dimensional ◽  
Integral Imaging ◽  
Led Array ◽  
Three Dimensional Display

Performers’ Motions Reflect the Intention to Express Short or Long Melodic Groupings

2018 ◽  
Vol 35 (4) ◽  
pp. 437-453 ◽  
Author(s):  
Madeline Huberth ◽  
Takako Fujioka
Keyword(s):  
Two Dimensional ◽  
Video Cameras ◽  
Musical Excerpt ◽  
Pitch Structure ◽  
Intended Interpretation

Some movements that musicians make are non-essential to their instrumental playing, yet express their intentions and interpretations of music’s structures. One such potential interpretation is the choice to emphasize short melodic groupings or to integrate these groupings into a phrase. This study aimed to characterize the nature of head motions associated with either interpretation by having cellists play two versions of a musical excerpt: 1) with short groupings specified, and 2) with long groupings specified. Cellists were filmed by two video cameras (front and right-side perspective) and the positions of their forehead and cheek were analyzed in their respective two-dimensional spaces. We hypothesized that the amount and frequency of movements would change according to the intended grouping. The results show that, overall, participants’ heads move more frequently when intending short groupings compared to long groupings. However, the extent of the change in motion varied across different sections of the excerpt. It appears that performers may invest more effort to emphasize the intended interpretation when a given local pitch structure more easily affords alternative interpretations. Our results illustrate that performers can embody melodic groupings based on intended interpretation.

scholarly journals Recognition of Images Formed in Pho on the Eyes of different Subjects

2021 ◽  
Vol 11 (4) ◽  
pp. 3023-3029
Author(s):  
Muhammad Junaid ◽  
Luqman Shah ◽  
Ali Imran Jehangiri ◽  
Fahad Ali Khan ◽  
Yousaf Saeed ◽  
...  
Keyword(s):  
Visual Information ◽  
Character Recognition ◽  
Optical Character Recognition ◽  
Good Resolution ◽  
Still Images ◽  
Still Image ◽  
Video Cameras ◽  
Video Footage ◽  
Video Clips ◽  
Human Eyes

With each passing day resolutions of still image/video cameras are on the rise. This amelioration in resolutions has the potential to extract useful information on the view opposite the photographed subjects from their reflecting parts. Especially important is the idea to capture images formed on the eyes of photographed people and animals. The motivation behind this research is to explore the forensic importance of the images/videos to especially analyze the reflections of the background of the camera. This analysis may include extraction/ detection/recognition of the objects in front of the subjects but on the back of the camera. In the national context such videos/photographs are not rare and, specifically speaking, an abductee’s video footage at a good resolution may give some important clues to the identity of the person who kidnapped him/her. Our aim would be to extract visual information formed in human eyes from still images as well as from video clips. After extraction, our next task would be to recognize the extracted visual information. Initially our experiments would be limited on characters’ extraction and recognition, including characters of different styles and font sizes (computerized) as well as hand written. Although varieties of Optical Character Recognition (OCR) tools are available for characters’ extraction and recognition but, the problem is that they only provide results for clear images (zoomed).

Attitude Angle Measurement Method Based on the Three-Dimensional Accelerometer

2013 ◽  
Vol 333-335 ◽  
pp. 152-156
Author(s):  
Yu Fa Tang ◽  
He Zhang ◽  
Li Hong
Keyword(s):  
Circuit Design ◽  
Inclination Angle ◽  
Attitude Determination ◽  
Three Dimensional ◽  
Angle Measurement ◽  
Two Dimensional ◽  
Theoretical Support ◽  
Attitude Angle ◽  
Hardware Circuit

On the basis of a study of measuring inclination angle with a two-dimensional accelerometer, a principle method using a three-dimensional accelerometer to measure attitude angle is analysed on the condition of micro-rotating. The method can reduce random systematic errors caused by uniaxial or biaxial output of the two-dimensional accelerometer. It can simultaneously measure both inclination angle and roll angle. So hardware selection, hardware circuit design and experiments are done: simulate the roll and tilt movement of the special objects and compare the solver results with the actual results. The principle method achieves preferable results, and provides a theoretical support for attitude determination of a particular industry as well.

Two-Dimensional 4× 4 Optical Fiber Array Applied to a Monolithic LED Array

1983 ◽  
Vol 22 (Part 2, No. 9) ◽  
pp. L597-L599 ◽  
Author(s):  
Hiroyuki Nobuhara ◽  
Tomonobu Sugahara ◽  
Osamu Wada ◽  
Teruo Sakurai
Keyword(s):  
Optical Fiber ◽  
Two Dimensional ◽  
Fiber Array ◽  
Led Array ◽  
Optical Fiber Array

scholarly journals Determining amplitude and tilt of a lateral force microscopy sensor

2021 ◽  
Vol 12 ◽  
pp. 517-524
Author(s):  
Oliver Gretz ◽  
Alfred J Weymouth ◽  
Thomas Holzmann ◽  
Korbinian Pürckhauer ◽  
Franz J Giessibl
Keyword(s):  
Atomic Force Microscopy ◽  
Lateral Force ◽  
Scanning Tunneling ◽  
Two Dimensional ◽  
Local Surface ◽  
Lateral Force Microscopy ◽  
Tunneling Microscopy ◽  
Force Microscopy ◽  
Atomic Force ◽  
Calibration Methods

In lateral force microscopy (LFM), implemented as frequency-modulation atomic force microscopy, the tip oscillates parallel to the surface. Existing amplitude calibration methods are not applicable for mechanically excited LFM sensors at low temperature. Moreover, a slight angular offset of the oscillation direction (tilt) has a significant influence on the acquired data. To determine the amplitude and tilt we make use of the scanning tunneling microscopy (STM) channel and acquire data without and with oscillation of the tip above a local surface feature. We use a full two-dimensional current map of the STM data without oscillation to simulate data for a given amplitude and tilt. Finally, the amplitude and tilt are determined by fitting the simulation output to the data with oscillation.

scholarly journals Novel circuit design for high-impedance and non-local electrical measurements of two-dimensional materials

2018 ◽  
Vol 89 (2) ◽  
pp. 024705 ◽  
Author(s):  
Adolfo De Sanctis ◽  
Jake D. Mehew ◽  
Saad Alkhalifa ◽  
Callum P. Tate ◽  
Ashley White ◽  
...  
Keyword(s):  
Circuit Design ◽  
Two Dimensional ◽  
Electrical Measurements ◽  
High Impedance ◽  
Two Dimensional Materials ◽  
Non Local

scholarly journals High-precision analysis of SF<sub>6</sub> at ambient level

2013 ◽  
Vol 6 (9) ◽  
pp. 2293-2299 ◽  
Author(s):  
J. S. Lim ◽  
D. M. Moon ◽  
J. S. Kim ◽  
W.-T. Yun ◽  
J. Lee
Keyword(s):  
United States Of America ◽  
Calibration Method ◽  
Gas Chromatograph ◽  
Activated Alumina ◽  
Calibration Laboratory ◽  
Working Standard ◽  
Calibration Methods ◽  
Precise Analysis ◽  
The World ◽  
Korea Research Institute

Abstract. This work reports on the development of a technique for the precise analysis of ambient SF6. This technique, which involves a gas chromatograph/electron capture detector (GC-ECD) coupled with an Activated Alumina-F1 (AA-F1) column, performed well in the measurements, particularly in terms of accuracy, which complies with the World Meteorological Organization (WMO)-recommended compatibility of 0.02 ppt. Compared to the Porapak Q technique, we observed a sharper peak shape for the SF6 stream, which substantiates the improvement in the analytical precision. The traceability to the WMO scale was tested by calibrating the GC-ECD/AA-F1 analyser using five SF6 standards provided by the WMO/Global Atmosphere Watch (GAW) Central Calibration Laboratory (CCL) for SF6 (NOAA, United States of America). After calibration by various methods, the GC-ECD/AA-F1 accurately estimated the mole fraction of SF6 in the working standard prepared by the World Calibration Centre for SF6 operated by the Korea Meteorological Administration (KMA)/Korea Research Institute of Standards and Science (KRISS). Among the calibration methods, the two-point calibration method emerged to be the most economical procedure in terms of the data quality and measurement time. It was found that the KRISS scale of SF6/N2 was biased by 0.13 ppt when compared to the WMO scale of SF6/air; this bias is probably due to a different matrix.

Sign in / Sign up

Export Citation Format

Share Document