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Proceedings Paper

Tools for interpretation of multispectral data
Author(s): Glen Speckert; Loren C. Carpenter; Mike Russell; John Bradstreet; Tom Waite; Charlie Conklin
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Paper Abstract

The large size and multiple bands of todays satellite data require increasingly powerful tools in order to display and interpret the acquired imagery in a timely fashion. Pixar has developed two major tools for use in this data interpretation. These tools are the Electronic Light Table (ELT), and an extensive image processing package, ChapiP. These tools operate on images limited only by disk volume size, currently 3 Gbytes. The Electronic Light Table package provides a fully windowed interface to these large 12 bit monochrome and multiband images, passing images through a software defined image interpretation pipeline in real time during an interactive roam. A virtual image software framework allows interactive modification of the visible image. The roam software pipeline consists of a seventh order polynomial warp, bicubic resampling, a user registration affine, histogram drop sampling, a 5x5 unsharp mask, and per window contrast controls. It is important to note that these functions are done in software, and various performance tradeoffs can be made for different applications within a family of hardware configurations. Special high spped zoom, rotate, sharpness, and contrast operators provide interactive region of interest manipulation. Double window operators provide for flicker, fade, shade, and difference of two parent windows in a chained fashion. Overlay graphics capability is provided in a PostScfipt* windowed environment (NeWS**). The image is stored on disk as a multi resolution image pyramid. This allows resampling and other image operations independent of the zoom level. A set of tools layered upon ChapIP allow manipulation of the entire pyramid file. Arbitrary combinations of bands can be computed for arbitrary sized images, as well as other image processing operations. ChapIP can also be used in conjunction with ELT to dynamically operate on the current roaming window to append the image processing function onto the roam pipeline. Multiple ChapiP operations can be thus chained. A videotape showing the use of ELT and ChapIP with multispectral data will be presented.

Paper Details

Date Published: 1 August 1990
PDF: 8 pages
Proc. SPIE 1259, Extracting Meaning from Complex Data: Processing, Display, Interaction, (1 August 1990); doi: 10.1117/12.19985
Show Author Affiliations
Glen Speckert, Pixar (United States)
Loren C. Carpenter, Pixar (United States)
Mike Russell, Pixar (United States)
John Bradstreet, Pixar (United States)
Tom Waite, Pixar (United States)
Charlie Conklin, Pixar (United States)

Published in SPIE Proceedings Vol. 1259:
Extracting Meaning from Complex Data: Processing, Display, Interaction
Edward J. Farrell, Editor(s)

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