Digital restoration of distorted geometric features of pigs

Emmanuel Van der Stuyft; Vic Goedseels; Rony Geers

doi:10.1117/12.25090

1 February 1991 Digital restoration of distorted geometric features of pigs

Emmanuel Van der Stuyft, Vic Goedseels, Rony Geers

Proceedings Volume 1379, Optics in Agriculture; (1991) https://doi.org/10.1117/12.25090
Event: Advances in Intelligent Robotics Systems, 1990, Boston, MA, United States

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

Citation Download Citation

Emmanuel Van der Stuyft, Vic Goedseels, and Rony Geers "Digital restoration of distorted geometric features of pigs", Proc. SPIE 1379, Optics in Agriculture, (1 February 1991); https://doi.org/10.1117/12.25090

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