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Articles 1 - 5 of 5
Full-Text Articles in Physical Sciences and Mathematics
Sensor-Assisted Video Mapping Of The Seafloor, Yuri Rzhanov, Lloyd C. Huff, Randy G. Cutter Jr., Larry A. Mayer
Sensor-Assisted Video Mapping Of The Seafloor, Yuri Rzhanov, Lloyd C. Huff, Randy G. Cutter Jr., Larry A. Mayer
Center for Coastal and Ocean Mapping
In recent years video surveys have become an increasingly important ground-truthing of acousticseafloor characterization and benthic habitat mapping studies. However, the ground-truthing and detailed characterization provided by video are still typically done using sparse sample imagery supplemented by physical samples. Combining single video frames in a seamless mosaic can provide a tool by which imagery has significant areal coverage, while at the same time showing small fauna and biological features at mm resolution. The generation of such a mosaic is a challenging task due to height variations of the imaged terrain and decimeter scale knowledge of camera position. This paper …
Seafloor Video Mapping: Modeling, Algorithms, Apparatus, Yuri Rzhanov, Lloyd C. Huff, Randy G. Cutter Jr.
Seafloor Video Mapping: Modeling, Algorithms, Apparatus, Yuri Rzhanov, Lloyd C. Huff, Randy G. Cutter Jr.
Center for Coastal and Ocean Mapping
This paper discusses a technique used for construction of high-resolution image mosaic from a videosequence and the synchronously logged camera attitude information. It allows one to infer geometric characteristics of the imaged terrain and hence improve the mosaic quality and reduce the computational burden. The technique is demonstrated using numerical modeling and is applied to videodata collected on Rainsford Island, Mass. Calculation of the transformation relating consecutive image frames is an essential operation affecting reliability of the whole mosaicing process. Improvements to the algorithm are suggested, which significantly decrease the possibility of convergence to an inappropriate solution.
Underwater Video Survey: Planning And Data Processing, Yuri Rzhanov, Lloyd C. Huff, Randy G. Cutter Jr.
Underwater Video Survey: Planning And Data Processing, Yuri Rzhanov, Lloyd C. Huff, Randy G. Cutter Jr.
Center for Coastal and Ocean Mapping
The importance of underwater video surveys as an exploration tool has been steadily increasing over recent years [1]. Better photographic equipment, more effective sources of illumination, and improved processing techniques - all make video surveying a reliable tool for seafloor habitat mapping, sediment boundary delineation and groundtruthing, mapping and documentation of forensic and archaeological sites. There is a change in attitude towards video surveying that affects the way the data is collected, and hence its quality. Earlier video data processing algorithms had to cope with whatever was recorded (often simultaneously with acquisition of other data, considered to be more important). …
A Method For The Perceptual Optimization Of Complex Visualizations, Donald H. House, Colin Ware
A Method For The Perceptual Optimization Of Complex Visualizations, Donald H. House, Colin Ware
Center for Coastal and Ocean Mapping
A common problem in visualization applications is the display of one surface overlying another. Unfortunately, it is extremely difficult to do this clearly and effectively. Stereoscopic viewing can help, but in order for us to be able to see both surfaces simultaneously, they must be textured, and the top surface must be made partially transparent. There is also abundant evidence that all textures are not equal in helping to reveal surface shape, but there are no general guidelines describing the best set of textures to be used in this way. What makes the problem difficult to perceptually optimize is that …
Frame Of Reference Interaction., Matthew D. Plumlee, Colin Ware
Frame Of Reference Interaction., Matthew D. Plumlee, Colin Ware
Center for Coastal and Ocean Mapping
We present a unified set of 3D interaction techniques that demonstrates an alternative way of thinking about the navigation of large virtual spaces in non-immersive environments. Our alternative conceptual framework views navigation from a cognitive perspective—as a way of facilitating changes in user attention from one reference frame to another—rather than from the mechanical perspective of moving a camera between different points of interest. All of our techniques link multiple frames of reference in some meaningful way. Some techniques link multiple windows within a zooming environment while others allow seamless changes of user attention between static objects, moving objects, and …