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Optical Image Blending For Underwater Mosaics, Fan Gu, Yuri Rzhanov
Optical Image Blending For Underwater Mosaics, Fan Gu, Yuri Rzhanov
Center for Coastal and Ocean Mapping
Typical problems for creation of consistent underwater mosaic are misalignment and inhomogeneous illumination of the image frames, which causes visible seams and consequently complicates post-processing of the mosaics such as object recognition and shape extraction. Two recently developed image blending methods were explored in the literature: "gradient domain stitching" and "graph-cut" method, and they allow for improvement of illumination inconsistency and "ghosting" effects, respectively. However, due to the specifics of underwater imagery, these two methods cannot be used within a straightforward manner. In this paper, a new improved blending algorithm is proposed based on these two methods. By comparing with …
Experiments For Multibeam Backscatter Adjustments On The Noaa Ship Fairweather, Luciano E. Fonseca, Brian R. Calder
Experiments For Multibeam Backscatter Adjustments On The Noaa Ship Fairweather, Luciano E. Fonseca, Brian R. Calder
Center for Coastal and Ocean Mapping
A series of experiments were conducted to adjust and normalize the acoustic backscatter acquired by Reson 8111 and 8160 systems. The dependency of the backscatter on the receiver gain, transmit power, pulse width and acquisition mode was analyzed. Empirical beam patterns are calculated as the difference between the backscatter measured by the sonars and the expected backscatter. Expected acoustic backscatter is estimated based on a mathematical model.
Self-Positioning Smart Buoys, The 'Un-Buoy' Solution: Logistic Considerations Using Autonomous Surface Craft Technology And Improved Communications Infrastructure, Joseph A. Curcio, Philip A. Mcgillivary, Kevin Fall, Andrew Maffei, Kurt Schwehr, Bob Twiggs, Chris Kitts, Phil Ballou
Self-Positioning Smart Buoys, The 'Un-Buoy' Solution: Logistic Considerations Using Autonomous Surface Craft Technology And Improved Communications Infrastructure, Joseph A. Curcio, Philip A. Mcgillivary, Kevin Fall, Andrew Maffei, Kurt Schwehr, Bob Twiggs, Chris Kitts, Phil Ballou
Center for Coastal and Ocean Mapping
Moored buoys have long served national interests, but incur high development, construction, installation, and maintenance costs. Buoys which drift off-location can pose hazards to mariners, and in coastal waters may cause environmental damage. Moreover, retrieval, repair and replacement of drifting buoys may be delayed when data would be most useful. Such gaps in coastal buoy data can pose a threat to national security by reducing maritime domain awareness. The concept of self-positioning buoys has been advanced to reduce installation cost by eliminating mooring hardware. We here describe technology for operation of reduced cost self-positioning buoys which can be used in …
Significant Tectonic And Climatic Events For The Yakutat Block Collision, Gulf Of Alaska: Pleistocene Glacial Intensification In The St. Elias Mountains And The Relationship Between The Fairweather And Transition Faults, Sean P.S. Gulick, Bryce A. Willems, Jeffrey T. Freymueller, Ross D. Powell, John M. Jaeger, Jay Kalbas, John M. Jaeger, Terry L. Pavlis, Lindsay A, Lowe, Larry A. Mayer, James V. Gardner
Significant Tectonic And Climatic Events For The Yakutat Block Collision, Gulf Of Alaska: Pleistocene Glacial Intensification In The St. Elias Mountains And The Relationship Between The Fairweather And Transition Faults, Sean P.S. Gulick, Bryce A. Willems, Jeffrey T. Freymueller, Ross D. Powell, John M. Jaeger, Jay Kalbas, John M. Jaeger, Terry L. Pavlis, Lindsay A, Lowe, Larry A. Mayer, James V. Gardner
Center for Coastal and Ocean Mapping
No abstract provided.