A Digital Correction Method for Increased Dynamic Range in Interferometric Six-Port Radars

2021 ◽  
pp. 1-1
Author(s):  
S. Krause ◽  
F. Michler ◽  
A. Kolpin ◽  
M. Rudolph ◽  
W. Heinrich
Keyword(s):  
Dynamic Range ◽  
Correction Method ◽  
Digital Correction

Application of the cepstrum method for processing iridology television signals

2021 ◽  
Author(s):  
Keyword(s):  
Dynamic Range ◽  
Video Signal ◽  
Signal Power ◽  
Television System ◽  
Digital Correction ◽  
Linear And Nonlinear ◽  
Reading Beam

The questions of the cepstrum method application for the processing of iridology television signals are considered. A cepstrum method for processing a delayed video signal of an aerospace television system is proposed. The application of the method greatly facilitates the determination of the delay and expands the dynamic range of the corrected signal. An expression for determining the power cepstrum at different apertures of the reading beam is received and a suboptimal model of an ideal corrector is designed. Keywords aperture correction; digital correction; linear and nonlinear correctors; cepstrum method; aperture; Gaussian aperture; exponential aperture; signal power cepstrum

scholarly journals Evacuation Priority Method in Tsunami Hazard Based on DMSP/OLS Population Mapping in the Pearl River Estuary, China

2019 ◽  
Vol 8 (3) ◽  
pp. 137 ◽  
Author(s):  
Bahaa Mohamadi ◽  
Shuisen Chen ◽  
Jia Liu
Keyword(s):  
Population Density ◽  
Wave Height ◽  
Dynamic Range ◽  
River Estuary ◽  
Pearl River Estuary ◽  
Correction Method ◽  
Coastal Areas ◽  
Tsunami Hazard ◽  
Pearl River ◽  
Density Mapping

Evacuation plans are critical in case of natural disaster to save people’s lives. The priority of population evacuation on coastal areas could be useful to reduce the death toll in case of tsunami hazard. In this study, the population density remote sensing mapping approach was developed using population records in 2013 and Defense Meteorological Satellite Program’s Operational Linescan System (DMSP/OLS) night-time light (NTL) image of the same year for defining the coastal densest resident areas in Pearl River Estuary (PRE), China. Two pixel-based saturation correction methods were evaluated for application of population density mapping to enhance DMSP/OLS NTL image. The Vegetation Adjusted NTL Urban Index (VANUI) correction method (R2 (original/corrected): 0.504, Std. error: 0.0069) was found to be the better-fit correction method of NTL image saturation for the study area compared to Human Settlement Index (HSI) correction method (R2 (original/corrected): 0.219, Std. error: 0.1676). The study also gained a better dynamic range of HSI correction (0~25 vs. 0.1~5.07) compared to the previous one [27]. The town-level’s population NTL simulation model is built (R2 = 0.43, N = 47) for the first time in PRE with mean relative error (MSE) of 32% (N = 24, town level), On the other side, the tsunami hazard map was produced based on numerical modeling of potential tsunami wave height and velocity, combining with the river net system, elevation, slope, and vegetation cover factors. Both results were combined to produce an evacuation map in PRE. The simulation of tsunami exposure on density of population showed that the highest evacuation priority was found to be in most of Zhuhai city area and the coastal area of Shenzhen City under wave height of nine meters, while lowest evacuation priority was defined in Panyu and Nansha Districts of Guangzhou City, eastern and western parts of Zhongshan City, and northeast and northwest parts of Dongguan City. The method of tsunami risk simulation and the result of mapped tsunami exposure are of significance for direction to tsunami disaster-risk reduction or evacuation traffic arrangement in PRE or other coastal areas in the world.

scholarly journals Digital correction method for realizing a phase-stable dual-comb interferometer

2018 ◽  
Vol 26 (13) ◽  
pp. 16813 ◽  
Author(s):  
Zebin Zhu ◽  
Kai Ni ◽  
Qian Zhou ◽  
Guanhao Wu
Keyword(s):  
Correction Method ◽  
Digital Correction

Digital Correction Method for an H-Field Sensor in Power System EMC Measurements

2004 ◽  
Vol 19 (3) ◽  
pp. 952-956 ◽  
Author(s):  
Q. Li ◽  
W.H. Siew ◽  
M.G. Stewart ◽  
K. Walker ◽  
C. Piner
Keyword(s):  
Power System ◽  
Correction Method ◽  
Digital Correction ◽  
Field Sensor

scholarly journals An Amplifier-Less Acquisition Chain for Power Measurements in Series Resonant Inverters

Sensors ◽  
2019 ◽  
Vol 19 (19) ◽  
pp. 4343
Author(s):  
Jorge Villa ◽  
José I. Artigas ◽  
Luis A. Barragán ◽  
Denis Navarro
Keyword(s):  
Correction Method ◽  
Analog To Digital ◽  
Digital Correction ◽  
Resonant Inverter ◽  
Series Resonant ◽  
In Series ◽  
Driver Amplifier ◽  
Series Resonant Inverter ◽  
The Cost ◽  
Power Measurements

Successive approximation register (SAR) analog-to-digital converter (ADC) manufacturers recommend the use of a driver amplifier to achieve the best performance. When a driver amplifier is not used, the conversion speed is severely penalized because of the need to meet the settling time constraint. This paper proposes a simple digital correction method to raise the performance (conversion speed and/or accuracy) when the acquisition chain lacks a driver amplifier. It is intended to reduce the cost, size and power consumption of the conditioning circuit while maintaining acceptable performance. The method is applied to the measurement of the output power delivered by a series resonant inverter for domestic induction heating.

A Novel Test Rig for Assessing Advanced Rotor Blade Cooling Concepts, Measurement Technique and First Results

2017 ◽  
Author(s):  
Maximilian Elfner ◽  
Achmed Schulz ◽  
Hans-Jörg Bauer ◽  
Knut Lehmann
Keyword(s):  
Surface Temperature ◽  
Rotor Blade ◽  
Dynamic Range ◽  
Measurement Techniques ◽  
Calibration Method ◽  
Correction Method ◽  
Test Rig ◽  
Cooling Effectiveness ◽  
Blade Cooling ◽  
First Results

This paper presents a new approach for assessing rotor blade cooling concepts. A new test rig has been designed, built and commissioned, allowing fast comparison of different cooling schemes as well as absolute surface temperature measurements for different cooling concepts. By scaling the test specimen, full aerothermal similarity was achieved at high measurement accuracy and resolution. This similarity however poses high demand on the employed measurement techniques. Surface temperature (and thus cooling effectiveness) is measured using high resolution, high dynamic range infrared thermography with an improved calibration method for in-situ radiation correction. Furthermore, an improved image evaluation algorithm is presented, allowing angle-of-view dependent emissivity correction and full 3D-evaluation of image data. Those improvements enable the measurement on strongly cooled and strongly curved surfaces, and thus the use of scaled rotor blades with true geometry. First results are presented comparing total cooling effectiveness of a conventionally cooled blade with internal ribs to the effectiveness of an internal swirl design blade. They show the feasibility of the measurements and the importance of the presented correction method.

scholarly journals RESEARCH ON COLOR CORRECTION METHOD OF GREENHOUSE TOMATO PLANT IMAGE BASED ON HIGH DYNAMIC RANGE IMAGING

2021 ◽  
pp. 393-402
Author(s):  
Min Li
Keyword(s):  
Tomato Plant ◽  
Dynamic Range ◽  
High Dynamic Range ◽  
Correction Method ◽  
Color Correction ◽  
High Dynamic Range Imaging ◽  
Range Imaging ◽  
Plant Image ◽  
High Dynamic ◽  
Band Image

In this paper, aiming at the need of stable access to visual information of intelligent management of greenhouse tomatoes, the color correction method of tomato plant image based on high dynamic range imaging technology was studied, in order to overcome the objective limitation of complex natural lighting conditions on the stable color presentation of working objects. In view of the color distortion caused by the temporal and spatial fluctuation of illumination in greenhouse and sudden change of radiation intensity in complex background, a calibration method of camera radiation response model based on multi-exposure intensity images is proposed. The fusion effect of multi band image is evaluated by field test. The results show that after multi band image fusion processing, the brightness difference between the recognized target and other near color background is significantly enhanced, and the brightness fluctuation of the background is suppressed. The color correction method was verified by field experiments, and the gray information, discrete degree and clarity of tomato plant images in different scenes and periods were improved.

scholarly journals Weak-Light Image Enhancement Method Based on Adaptive Local Gamma Transform and Color Compensation

2021 ◽  
Vol 2021 ◽  
pp. 1-18
Author(s):  
Wencheng Wang ◽  
Xiaohui Yuan ◽  
Zhenxue Chen ◽  
XiaoJin Wu ◽  
Zairui Gao
Keyword(s):  
Image Enhancement ◽  
Dynamic Range ◽  
Color Space ◽  
Correction Method ◽  
Source Image ◽  
Low Contrast ◽  
Reflection Model ◽  
Color Compensation ◽  
Enhancement Method ◽  
Weak Light

In weak-light environments, images suffer from low contrast and the loss of details. Traditional image enhancement models are usually failure to avoid the issue of overenhancement. In this paper, a simple and novel correction method is proposed based on an adaptive local gamma transformation and color compensation, which is inspired by the illumination reflection model. Our proposed method converts the source image into YUV color space, and the Y component is estimated with a fast guided filter. The local gamma transform function is used to improve the brightness of the image by adaptively adjusting the parameters. Finally, the dynamic range of the image is optimized by a color compensation mechanism and a linear stretching strategy. By comparing with the state-of-the-art algorithms, it is demonstrated that the proposed method adaptively reduces the influence of uneven illumination to avoid overenhancement and improve the visual effect of low-light images.

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