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Proceedings Paper

Digital restoration of distorted geometric features of pigs
Author(s): Emmanuel Van der Stuyft; Vic Goedseels; Rony Geers
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Paper Abstract

The rate at which pigs expose themselves to their thermal environment provides a parameter of interest in thermoregulation-. related research. A set of algorithms was developed to compensate for the distortion introduced under test conditions in the relevant image information. Restoration was obtained by reconstruction into three dimensional space of the scene based on knowledge of both camera behaviour and " pig-edge shape " . 1. PROBLEM AND OBJECTIVE Boon''s experimental data (figure la) suggest that the floor area covered by a group of resting pigs in a standardized test set-up provides a quantitative indication of their thermal need at least as accurate as his more intricately vision-related ''huddling index'' concept1. Bruce and Boon2 interprete the observed behaviour as the establishment of a situation of minimal discomfort involving a balance between a " mechanical discomfort component " - linked to group crowding when reducing exposure to thermal environment - and a remaining " thermal discomfort component " . Figure lb depicts a transposition of the curves deduced from the experimental data in figure la (supplementedwith extra knowledge on the pigs'' thermobehaviour) onto a reference scale more purely reflecting the involved external demands: - Mechanical discomfort as approximately reflected in group weight divided by projected group area (given weight this parameter is extractable from image data). - Thermal demand estimated based on the position of the ambient temperature relative to the temperature

Paper Details

Date Published: 1 February 1991
PDF: 12 pages
Proc. SPIE 1379, Optics in Agriculture, (1 February 1991); doi: 10.1117/12.25090
Show Author Affiliations
Emmanuel Van der Stuyft, Catholic Univ. of Leuven (Belgium)
Vic Goedseels, Catholic Univ. of Leuven (Belgium)
Rony Geers, Catholic Univ. of Leuven (Belgium)


Published in SPIE Proceedings Vol. 1379:
Optics in Agriculture
James A. DeShazer; George E. Meyer, Editor(s)

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