NDLI: A frequency-sensitive point hierarchy for images and volumes

Content Provider	IEEE Xplore Digital Library
Author	Welsh, T. Mueller, K.
Copyright Year	2003
Description	Author affiliation: Center for Visual Comput., Comput. Sci., Stony Brook Univ., USA (Welsh, T.; Mueller, K.)
Abstract	This paper introduces a method for converting an image or volume sampled on a regular grid into a space-efficient irregular point hierarchy. The conversion process retains the original frequency characteristics of the dataset by matching the spatial distribution of sample points with the required frequency. To achieve good blending, the spherical points commonly used in volume rendering are generalized to ellipsoidal point primitives. A family of multiresolution, oriented Gabor wavelets provide the frequency-space analysis of the dataset. The outcome of this frequency analysis is the reduced set of points, in which the sampling rate is decreased in originally oversampled areas. During rendering, the traversal of the hierarchy can be controlled by any suitable error metric or quality criteria. The local level of refinement is also sensitive to the transfer function. Areas with density ranges mapped to high transfer function variability are rendered at higher point resolution than others. Our decomposition is flexible and can be used for iso-surface rendering, alpha compositing and X-ray rendering of volumes. We demonstrate our hierarchy with an interactive splatting volume renderer, in which the traversal of the point hierarchy for rendering is modulated by a user-specified frame rate.
Sponsorship	IEEE Comput. Soc. Tech. Comm. on Visualisation and Graphics
Starting Page	425
Ending Page	432
File Size	699192
Page Count	8
File Format	PDF
ISBN	0780381203
DOI	10.1109/VISUAL.2003.1250403
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2003-10-19
Publisher Place	USA
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Frequency Rendering (computer graphics) Image sampling Transfer functions Root mean square Discrete wavelet transforms Computer science Engines Computer errors USA Councils
Content Type	Text
Resource Type	Article

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4	Project PI / Joint PI	Principal Investigator and Joint Principal Investigators of the project	Dr. B. Sutradhar bsutra@ndl.gov.in Prof. Saswat Chakrabarti will be added soon
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