Recently, visual image analysis (VIA) has been proposed as a
method for real-time and continuous monitoring of pig weight
gain performance, thereby allowing quicker detection of problems
and more effective management decisions (Marchant et al., 1999).
The VIA technique uses aerial-view images of animals provided by
cameras to determine body surface dimensions and may be used
for real-time monitoring of pig weight. Since video analysis of pigs
has numerous other applications (Van der Stuyft et al., 1991; Xin,
1999; Kollis et al., 2007) weight estimation using videos can be
an added value for farmers provided they utilize vision technology.