Yuri Rzhanov | University of New Hampshire (original) (raw)

Papers by Yuri Rzhanov

Research paper thumbnail of On the (im)possibility of color reconstruction in underwater images

OCEANS 2019 MTS/IEEE SEATTLE, 2019

Color is an important cue in object recognition and classification problems. In underwater imager... more Color is an important cue in object recognition and classification problems. In underwater imagery, colors distort due to light propagation through an absorbing and scattering medium. Distortions depend on a number of complex phenomena, the most important being wavelength-dependent absorption and sensitivity of sensors in trichromatic cameras. Using a simplified model of spectral profile for various colored objects, we show by means of numerical simulation that for fixed hardware and medium properties there exist many spectral profiles that lead to different recorded colors in air (without absorption) but the same color in water (with absorption). The above implies that the restoration of true and unique colors from trichromatic underwater imagery is not possible.

Research paper thumbnail of Dynamical phase recording of signals in a semiconducting self-wave medium with a thermal-electrical instability

Soviet physics. Doklady, 1983

Research paper thumbnail of Landscape Mosaicing Techniques Versus Traditional Sampling Procedures for the Assessment of Subtidal Macroalgae Communities

Research paper thumbnail of Comparing manual and computer-assisted benthic cover estimations from underwater imagery for offshore wind farms impact assessment

Research paper thumbnail of Development of Advanced Technologies for Surveying Sea Scallops and Other Benthic Organisms

Research paper thumbnail of Subtidal Benthic Habitat Mapping Method Development Using Portsmouth Shallow Survey Data

Research paper thumbnail of The Sea State Condition as an Environmental Factor in Airborne Lidar Bathymetry (ALB)

Research paper thumbnail of Photogrammetry-Derived National Shoreline: Uncertainty and Sensitivity Analyses

Tidally-referenced shoreline data serve a multitude of purposes, ranging from nautical charting, ... more Tidally-referenced shoreline data serve a multitude of purposes, ranging from nautical charting, to coastal change analysis, wetland migration studies, coastal planning, resource management and emergency management. To assess the suitability of the shoreline for a particular application, end users need not only the best available shoreline, but also reliable estimates of the uncertainty in the shoreline position. NOAA’s National Geodetic Survey (NGS) is responsible for mapping the national shoreline depicted on NOAA nautical charts. Previous studies have focused on modeling the uncertainty in NGS shoreline derived from airborne lidar data, but, to date, these methods have not been extended to aerial imagery and photogrammetric shoreline extraction methods, which remain the primary shoreline mapping methods used by NGS. The aim of this study is to develop a rigorous total propagated uncertainty (TPU) model for shoreline compiled from both tide-coordinated and non-tide-coordinated aerial imagery and compiled using photogrammetric methods. The project site encompasses the strait linking Dennys Bay, Whiting Bay and Cobscook Bay in the “Downeast” Maine coastal region. This area is of interest, due to the ecosystem services it provides, as well as its complex geomorphology. The region is characterized by a large tide range, strong tidal currents, numerous embayments, and coarse-sediment pocket beaches. Statistical methods were used to assess the uncertainty of shoreline in this site mapped using NGS’s photogrammetric workflow, as well as to analyze the sensitivity of the mapped shoreline position to a variety of parameters, including elevation gradient in the intertidal zone. The TPU model developed in this work can easily be extended to other areas and may be facilitate estimation of uncertainty in inundation models and marsh migration models

Research paper thumbnail of Autowave Processes in Semiconductors with the Temperature-Electric Instability

Autowave processes (AWP) can be realized in open kinetic systems which are far from the thermodyn... more Autowave processes (AWP) can be realized in open kinetic systems which are far from the thermodynamic equilibrium. They are manifested by a variety of nonlinear waves, stationary spatial structures, domains, etc. These structures are stable to small fluctuations, independently of the initial and, often, of the boundary conditions. Many well-known phenomena observed in semiconductors with N- and S- shaped volt-ampere characteristics may be attributed to particular cases of AWP.

Research paper thumbnail of Review of Methods and Software for Processing of Underwater Imagery and Construction of Mosaics

Research paper thumbnail of Methodology of Processing of Stereoimagery of Fish Underwater: Software and Algorithms

Research paper thumbnail of Registration of the hyperspectral data to aerial photography (USACE's CHARTS systems)

Research paper thumbnail of Switching waves in a multistable interferometer: widths of fronts, interaction of waves, potential applications

Soviet Journal of Quantum Electronics, 1987

Research paper thumbnail of Switching waves in a multistable Fabry-Perot interferometer with a thermooptic nonlinearity

Soviet Journal of Quantum Electronics, 1984

Research paper thumbnail of Switching waves in a complex structure of a semiconductor interferometer with competing nonlinearities

Soviet Journal of Quantum Electronics, 1990

Research paper thumbnail of Spontaneous oscillations, transverse diffusion instability and spatial dissipative structures in optical bistability and multistability

Soviet Journal of Quantum Electronics, 1987

Research paper thumbnail of Investigation of switching waves in polystable active distributed media using the example of a distributed nonlinear Fabry-Perot interferometer

Research paper thumbnail of Simulating infra-red land clutter: an image processing data source

6th International Conference on Image Processing and its Applications, 1997

Research paper thumbnail of <title>Diffusive and diffractive transverse structures in bistable semiconductor interferometers with band edge absorption</title>

Transverse Patterns in Nonlinear Optics, 1992

Different types of transverse instabilities resulting in traveling and motionless spatial structu... more Different types of transverse instabilities resulting in traveling and motionless spatial structures in bistable semiconductor interferometers and injection lasers are investigated on the basis of the proposed generalized theoretical mode

Research paper thumbnail of Switching-front multistability in a bistable periodically inhomogeneous medium

Radiophysics and Quantum Electronics, 1989

Research paper thumbnail of On the (im)possibility of color reconstruction in underwater images

OCEANS 2019 MTS/IEEE SEATTLE, 2019

Color is an important cue in object recognition and classification problems. In underwater imager... more Color is an important cue in object recognition and classification problems. In underwater imagery, colors distort due to light propagation through an absorbing and scattering medium. Distortions depend on a number of complex phenomena, the most important being wavelength-dependent absorption and sensitivity of sensors in trichromatic cameras. Using a simplified model of spectral profile for various colored objects, we show by means of numerical simulation that for fixed hardware and medium properties there exist many spectral profiles that lead to different recorded colors in air (without absorption) but the same color in water (with absorption). The above implies that the restoration of true and unique colors from trichromatic underwater imagery is not possible.

Research paper thumbnail of Dynamical phase recording of signals in a semiconducting self-wave medium with a thermal-electrical instability

Soviet physics. Doklady, 1983

Research paper thumbnail of Landscape Mosaicing Techniques Versus Traditional Sampling Procedures for the Assessment of Subtidal Macroalgae Communities

Research paper thumbnail of Comparing manual and computer-assisted benthic cover estimations from underwater imagery for offshore wind farms impact assessment

Research paper thumbnail of Development of Advanced Technologies for Surveying Sea Scallops and Other Benthic Organisms

Research paper thumbnail of Subtidal Benthic Habitat Mapping Method Development Using Portsmouth Shallow Survey Data

Research paper thumbnail of The Sea State Condition as an Environmental Factor in Airborne Lidar Bathymetry (ALB)

Research paper thumbnail of Photogrammetry-Derived National Shoreline: Uncertainty and Sensitivity Analyses

Tidally-referenced shoreline data serve a multitude of purposes, ranging from nautical charting, ... more Tidally-referenced shoreline data serve a multitude of purposes, ranging from nautical charting, to coastal change analysis, wetland migration studies, coastal planning, resource management and emergency management. To assess the suitability of the shoreline for a particular application, end users need not only the best available shoreline, but also reliable estimates of the uncertainty in the shoreline position. NOAA’s National Geodetic Survey (NGS) is responsible for mapping the national shoreline depicted on NOAA nautical charts. Previous studies have focused on modeling the uncertainty in NGS shoreline derived from airborne lidar data, but, to date, these methods have not been extended to aerial imagery and photogrammetric shoreline extraction methods, which remain the primary shoreline mapping methods used by NGS. The aim of this study is to develop a rigorous total propagated uncertainty (TPU) model for shoreline compiled from both tide-coordinated and non-tide-coordinated aerial imagery and compiled using photogrammetric methods. The project site encompasses the strait linking Dennys Bay, Whiting Bay and Cobscook Bay in the “Downeast” Maine coastal region. This area is of interest, due to the ecosystem services it provides, as well as its complex geomorphology. The region is characterized by a large tide range, strong tidal currents, numerous embayments, and coarse-sediment pocket beaches. Statistical methods were used to assess the uncertainty of shoreline in this site mapped using NGS’s photogrammetric workflow, as well as to analyze the sensitivity of the mapped shoreline position to a variety of parameters, including elevation gradient in the intertidal zone. The TPU model developed in this work can easily be extended to other areas and may be facilitate estimation of uncertainty in inundation models and marsh migration models

Research paper thumbnail of Autowave Processes in Semiconductors with the Temperature-Electric Instability

Autowave processes (AWP) can be realized in open kinetic systems which are far from the thermodyn... more Autowave processes (AWP) can be realized in open kinetic systems which are far from the thermodynamic equilibrium. They are manifested by a variety of nonlinear waves, stationary spatial structures, domains, etc. These structures are stable to small fluctuations, independently of the initial and, often, of the boundary conditions. Many well-known phenomena observed in semiconductors with N- and S- shaped volt-ampere characteristics may be attributed to particular cases of AWP.

Research paper thumbnail of Review of Methods and Software for Processing of Underwater Imagery and Construction of Mosaics

Research paper thumbnail of Methodology of Processing of Stereoimagery of Fish Underwater: Software and Algorithms

Research paper thumbnail of Registration of the hyperspectral data to aerial photography (USACE's CHARTS systems)

Research paper thumbnail of Switching waves in a multistable interferometer: widths of fronts, interaction of waves, potential applications

Soviet Journal of Quantum Electronics, 1987

Research paper thumbnail of Switching waves in a multistable Fabry-Perot interferometer with a thermooptic nonlinearity

Soviet Journal of Quantum Electronics, 1984

Research paper thumbnail of Switching waves in a complex structure of a semiconductor interferometer with competing nonlinearities

Soviet Journal of Quantum Electronics, 1990

Research paper thumbnail of Spontaneous oscillations, transverse diffusion instability and spatial dissipative structures in optical bistability and multistability

Soviet Journal of Quantum Electronics, 1987

Research paper thumbnail of Investigation of switching waves in polystable active distributed media using the example of a distributed nonlinear Fabry-Perot interferometer

Research paper thumbnail of Simulating infra-red land clutter: an image processing data source

6th International Conference on Image Processing and its Applications, 1997

Research paper thumbnail of <title>Diffusive and diffractive transverse structures in bistable semiconductor interferometers with band edge absorption</title>

Transverse Patterns in Nonlinear Optics, 1992

Different types of transverse instabilities resulting in traveling and motionless spatial structu... more Different types of transverse instabilities resulting in traveling and motionless spatial structures in bistable semiconductor interferometers and injection lasers are investigated on the basis of the proposed generalized theoretical mode

Research paper thumbnail of Switching-front multistability in a bistable periodically inhomogeneous medium

Radiophysics and Quantum Electronics, 1989