Thread View: comp.graphics.explorer
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Started by Robert DeMillo
Thu, 15 Oct 1992 11:00
Release: Module "Reduce" for true subsampling
Author: Robert DeMillo
Date: Thu, 15 Oct 1992 11:00
Date: Thu, 15 Oct 1992 11:00
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Module "Reduce" version 0.9 is available for downloading from Gordon's site at epcc.ed.ac.uk in the /pub directory. I assume the module will also be available shortly from swedishchef. ---- Reduce ver. 0.9 "Reduce" is a module that performs *true* subsampling across a 3D uniform lattice data structure. Unlike the (inappropriately named) "Subsample" module which merely takes 'chunks' out of a data set, "Reduce" degrades the resolution of a volume data sample so that the volume can be more easily manipulated by Explorer. The user has complete control over the degradation of the voxel resolution for all three axes. By subsampling across the x/y/z axes, the user can maintain the x/y/z ratio of the original image. The indended purpose of reduce is to allow easier, less time consuming manipulations of large volumetric data sets within the Explorer scientific visualization package. Modules such as Contour and Render can more easily ingest a smaller volume, and allow the researcher to have a faster response time. When the researcher set up Explorer to manipulate the volume the way he or she choses, Reduce can be turned off to allow the full resolution of the data set to be allowed to pass through the pipeline. There are three subsampling functions that the user can use to degrade the resolution of the data set: Average: All voxels within a radius of "n" are averaged together to produce the new volume set, where "n" is determined by the user's reduction percentage. Center Point: Every "nth" voxel is sent to the new volume set, where "n" is determined by the user's reduction percentage. Percentage: This function is not implemented in this version. ------------ Reduce version 0.9 is fully functional except for the following: - Percentage is not functioning - x/y/z yoking is not functioning ------------ Send comments, complaints, etc to: - Rob DeMillo | Internet: demillo@juliet.ll.mit.edu MIT Lincoln Lab | America Online: exgalileo@aol.com Weather Sensing - Group 43 | Reality: 617-981-2105 (office) "Operation Goofy now in effect!" --- Tom Servo, "Gamera vs. Gaos," Mystery Science Theater 3000 -- - Rob DeMillo | Internet: demillo@juliet.ll.mit.edu MIT Lincoln Lab | America Online: exgalileo@aol.com Weather Sensing - Group 43 | Reality: 617-981-2105 (office) "Operation Goofy now in effect!" --- Tom Servo, "Gamera vs. Gaos," Mystery Science Theater 3000
Re: Release: Module "Reduce" for true subsampling
Author: Jeff Hanson
Date: Thu, 15 Oct 1992 18:04
Date: Thu, 15 Oct 1992 18:04
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Available on swedishchef.lerc.nasa.gov in explorer/modules. -- --------------------------------------------------------------------------- Jeff Hanson - Scientific Graphics Programmer and Workstation Administrator Sverdrup Technology, NASA Lewis Research Center Group NASA Lewis Research Center, MS 86-4, Cleveland, Ohio 44135 Telephone - (216) 433-2284 Fax - (216) 433-2182 tohanson@gonzo.lerc.nasa.gov - ViSC: Better Science Through Pictures Visualize whirled peas - Bumper sticker seen in Buffalo, NY
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