Development of ON-Line Three Dimensional Contour Extraction System for Poultry Carcass Using Laser Structured Lighting

다국어 초록 (Multilingual Abstract)

As an initial step to develop the on-line quality evaluation system for poultry processing, a prototype
laboratory scaled on-line three dimensional contour extraction of a poultry carcass was developed using
a set of computer vision system and a laser structured lighting device. A multi-parallel line pattern of
a structured laser was used. The proposed algorithm was composed of three stages. At the first stage,
the camera calibration, which determines the coordinate transformation between the image plane and the
real three dimensional world, was performed using known six pairs of points. At the second stage, utilizing
the shifting phenomena of the projected laser beam on the surface of a poultry carcass, the contour(
height) information of the carcass was computed. Finally, using the height information of the two
dimensional image point, the corresponding three dimensional coordinate information was computed
using results of the camera calibration. The maximum error of the extracted three dimensional feature
using the proposed algorithm was less then 0.7 mm. Results showed that the proposed system and algorithm
was accurate enough for on-line three dimensional geometric feature detection of a poultry carcass.
Three dimensional contour combined with two dimensional projection image of a poultry carcass
will be possible substitute of the conventional load cell based weight measurement for size grading of
a poultry carcass.