Filters








7,265 Hits in 6.2 sec

High-Quality Shadows for Streaming Terrain Rendering [article]

Matthäus G. Chajdas, Florian Reichl, Christian Dick, Rüdiger Westermann
2015 Eurographics State of the Art Reports  
While near-shadows are raytraced using the current cache content, far-shadows are precomputed and stored in a very compact format requiring approximately 3 bit per height-map sample for an entire day-night  ...  Adding dynamic shadows as they appear during a day-night cycle remais a challenge however, because shadow rendering requires access to the entire terrain, invalidating data streaming strategies.  ...  Acknowlegments The authors wish to thank the Landesvermessungsamt Feldkirch, Austria and the State of Utah for providing high resolution geo data.  ... 
doi:10.2312/egsh.20151014 fatcat:bnushv2savepphdvd377j3d4we

Interactive landscape visualization using GPU ray casting

Stephan Mantler, Stefan Jeschke
2006 Proceedings of the 4th international conference on Computer graphics and interactive techniques in Australasia and Southeast Asia - GRAPHITE '06  
Abstract This paper demonstrates the simple yet effective usage of height fields for interactive landscape visualizations using a ray casting approach implemented in the pixel shader of modern graphics  ...  Given a height field of a terrain and a topographic map or similar data as input, the vegetation cover is extracted and stored on top of the height field in a preprocess, enhancing the terrain with forest  ...  LIDAR scan data courtesy of Sorin Popescu, Texas A&M University Spatial Sciences Laboratory. This publication was supported by the Austrian Science Fund (FWF) contract no. P17260 and P17261-N04.  ... 
doi:10.1145/1174429.1174448 dblp:conf/graphite/MantlerJ06 fatcat:hruj26tj6rcpdmoqesdsud463e

Stereo-vision-based terrain mapping for off-road autonomous navigation

Arturo L. Rankin, Andres Huertas, Larry H. Matthies, Grant R. Gerhart, Douglas W. Gage, Charles M. Shoemaker
2009 Unmanned Systems Technology XI  
Successful off-road autonomous navigation by an unmanned ground vehicle (UGV) requires reliable perception and representation of natural terrain.  ...  The mapping algorithm labels cells that contain obstacles as nogo regions, and encodes terrain elevation, terrain classification, terrain roughness, traversability cost, and a confidence value.  ...  achieve a maximum horizontal pixel footprint of 3cm in the bottom three swaths.  ... 
doi:10.1117/12.819099 fatcat:2fyuqahzofbk5mphsofyvlk3ve

The Landsat Image Mosaic of Antarctica

R BINDSCHADLER, P VORNBERGER, A FLEMING, A FOX, J MULLINS, D BINNIE, S PAULSEN, B GRANNEMAN, D GORODETZKY
2008 Remote Sensing of Environment  
Each image was orthorectified and adjusted for geometric, sensor and illumination variations to a standardized, almost seamless surface reflectance product.  ...  Mosaicing to avoid clouds produced a high quality, nearly cloudfree benchmark data set of Antarctica for the International Polar Year from images collected primarily during 1999-2003.  ...  It is regarded as a major benchmark data set of the International Polar Year. 40  ... 
doi:10.1016/j.rse.2008.07.006 fatcat:uzgq4w5kh5gupjq7vpancna2tq

Lossless data compression of grid-based digital elevation models: A png image format evaluation

G. Scarmana
2014 ISPRS Annals of the Photogrammetry, Remote Sensing and Spatial Information Sciences  
One particular type of map is the elevation map. When stored on a computer, it is often referred to as a Digital Elevation Model (DEM). A DEM is usually a square matrix of elevations.  ...  <br><br> In this context, this paper investigates the effects of the PNG (Portable Network Graphics) lossless image compression protocol on floating-point elevation values for 16-bit DEMs of dissimilar  ...  and resolution while preserving full integrity of the elevation data it represents.  ... 
doi:10.5194/isprsannals-ii-5-313-2014 fatcat:o63h6c6ajnbincm44itd4jqnwe

Compression of map images for real-time applications

Pasi Fränti, Eugene Ageenko, Pavel Kopylov, Sami Gröhn, Florian Berger
2004 Image and Vision Computing  
We introduce a storage system for the map images that supports compact storage size, decompression of partial image, and smooth transitions between various scales.  ...  The images are of the size 5000 £ 5000 pixels, and have the original scale 1:20,000. This corresponds to a resolution of two meters per pixel.  ...  We consider the following three transmission networks: † GSM, capable of 9600 bits per second, † high speed GSM, capable of 14,400 bits per second, † GRPS network, capable of 48 kb/s.  ... 
doi:10.1016/j.imavis.2004.05.009 fatcat:ux22nlpkkfgthjupq3yddlbude

C-BDAM ? Compressed Batched Dynamic Adaptive Meshes for Terrain Rendering

E. Gobbetti, F. Marton, P. Cignoni, M. Di Benedetto, F. Ganovelli
2006 Computer graphics forum (Print)  
We describe a compressed multiresolution representation for supporting interactive rendering of very large planar and spherical terrain surfaces.  ...  Earth created from high resolution SRTM data.  ...  A single bit per split is used to encode the quadtree structure.  ... 
doi:10.1111/j.1467-8659.2006.00952.x fatcat:qdlujtkf3zhqxkvh3cbuqkyaym

An Experimental Digital Interactive Facility

L.A. Gambino, B.L. Schrock
1977 Computer  
For example, Figure 3 is a reduced resolution photo of a 2,048 x 2,048 pixel , 8 bits per pixel image stored in the interactive system data base.  ...  At least 64 grey levels are represented on a good quality photograph which requires six bits to digitally represent a spot (pixel) while graphics generally require only one bit to represent lines.  ... 
doi:10.1109/c-m.1977.217816 fatcat:52ezlkwwwncqdlphngx6f4jrp4

High-quality networked terrain rendering from compressed bitstreams

Fabio Bettio, Enrico Gobbetti, Fabio Marton, Giovanni Pintore
2007 Proceedings of the twelfth international conference on 3D web technology - Web3D '07  
The structure combines the aggressive compression rates of wavelet-based image representations with the ability to ensure overall geometric continuity for variable resolution views of planar and spherical  ...  Abstract We describe a compressed multiresolution representation and a client-server architecture for supporting interactive high quality remote visualization of very large textured planar and spherical  ...  Sardinia has a bit rate of 0.23bps for elevation (0.68bps with Berkeley DB overhead), and 2.67bps (3.743bps) for color. The color bit rate is higher because elevation data is much smoother.  ... 
doi:10.1145/1229390.1229396 dblp:conf/vrml/BettioGMP07 fatcat:ccpepi73lvgjrlwss3tvxib3ru

Applications of Remote Image Sensing with the NASA Massively Parallel Processor [and Discussion]

M. Halem, D. Lane, J.-P. A. L. Muller
1988 Philosophical Transactions of the Royal Society A: Mathematical, Physical and Engineering Sciences  
Plates 1-4] Satellite observing systems are producing image observations of the E arth's surface and atmosphere with spectral and spatial resolutions that result in data rates that current general-purpose  ...  Finally, a work-station parallel processor for space station on-board image processing will be described.  ...  Clearly, on a per-pixel basis, one would not expect to find a field of corn surrounded by water or a forest at a 30 m resolution.  ... 
doi:10.1098/rsta.1988.0025 fatcat:ctdeffy5nfb63juy7tr27sf3re

Mars Exploration Rover Engineering Cameras

J. N. Maki, J. F. Bell, K. E. Herkenhoff, S. W. Squyres, A. Kiely, M. Klimesh, M. Schwochert, T. Litwin, R. Willson, A. Johnson, M. Maimone, E. Baumgartner (+10 others)
2003 Journal of Geophysical Research  
The Navigation cameras (Navcams, two per rover) are a mast-mounted stereo pair each with a 45°square field of view (FOV) and an angular resolution of 0.82 milliradians per pixel (mrad/pixel).  ...  The Descent camera (one per rover), mounted to the lander, has a 45°square FOV and will return images with spatial resolutions of $4 m/pixel.  ...  The MER camera effort required the con-  ... 
doi:10.1029/2003je002077 fatcat:kzfd3sikareglj6bql7uhitieu

Sparse terrain pyramids

Kenneth Weiss, Leila De Floriani
2008 Proceedings of the 16th ACM SIGSPATIAL international conference on Advances in geographic information systems - GIS '08  
In this work, we consider sparse terrain pyramids as a compact multiresolution representation for terrain datasets whose samples are a subset of those lying on a regular grid.  ...  While previous diamond-based approaches can efficiently represent meshes built on a complete grid of resolution (2 k + 1) 2 , this is not suitable when the field values are uniform in large areas or simply  ...  If |∆| is the number of diamonds in the full hierarchy, then a full representation requires 4 * |∆| bytes.  ... 
doi:10.1145/1463434.1463454 dblp:conf/gis/WeissF08 fatcat:wzljiuidizbyplsrn2ky3cs4j4

Scalable 3-D Terrain Visualization Through Reversible JPEG2000-Based Blind Data Hiding

K. Hayat, W. Puech, G. Gesquiere
2008 IEEE transactions on multimedia  
The process is essentially the mapping of the aerial photograph, called texture, onto its corresponding digital elevation model (DEM) implying at least two distinct data inputs.  ...  Whilst the compression must accommodate the scalability requirement originated by the diversity of clients, the unification of data ought to be synchronous.  ...  per 50 50 pixels of texture.  ... 
doi:10.1109/tmm.2008.2004905 fatcat:tvkebcxpwzdhrb5qv4ducsvvoi

Software Rasterization of 2 Billion Points in Real Time

Markus Schütz, Bernhard Kerbl, Michael Wimmer
2022 Proceedings of the ACM on Computer Graphics and Interactive Techniques  
Adaptive coordinate precision, in conjunction with visibility buffers, reduces the required data for the majority of points to just four bytes, making our approach several times faster than the bandwidth-limited  ...  Furthermore, support for LOD rendering makes our software rasterization approach suitable for rendering arbitrarily large point clouds, and to meet the elevated performance demands of virtual reality applications  ...  (b) Splitting coordinate bits into three separate buffers allows loading just the required bits, depending on the viewpoint.  ... 
doi:10.1145/3543863 fatcat:pe2rzqsjybgkngt777ft666anu

Reducing energy consumption of video memory by bit-width compression

V.G. Moshnyaga, K. Inoue, M. Fukagawa
2002 Proceedings of the International Symposium on Low Power Electronics and Design  
Unlike existing approaches, the technique exploits the pixel correlation in video sequences, dynamically adjusting the memory bit-width to the number of bits changed per pixel.  ...  A new architectural technique to reduce energy dissipation of video memory is proposed.  ...  As figure shows, only two words (1st and 4th) of the stream requires full 9-bit representation, while all the others are stored in the compressed (5-bit) form.  ... 
doi:10.1109/lpe.2002.146727 fatcat:loqp5jqgxjg4dccvisixbcnfx4
« Previous Showing results 1 — 15 out of 7,265 results