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A COLOR TECHNIQUE TO SIMPLIFY IMAGE PROCESSING IN MEASUREMENT OF PIG WEIGHT BY A HANDS-OFF METHOD
Published by the American Society of Agricultural and Biological Engineers, St. Joseph, Michigan www.asabe.orgCitation: Pp. 166-173 in Swine Housings II Proceedings of the 12-15 October 2003 Conference (Research Triangle Park, North Carolina USA), Publication Date 12 October 2003. 701P1303.(doi:10.13031/2013.15483)
Authors: H. Minagawa, O. Taira, and H. Nissato
To estimate pig weight by a hands-off method, we developed a device, which consists of a video camera, a slide projector, and a computer. The device measured the height and weight of a standing pig from above by imaging and image analysis. The slide projector was equipped with a clear slide film printed with black mesh lines in an orthogonal lattice pattern. When the shadow lines were projected on a pig with the slide projector, the parallax of a shadow line at the border between the pig and the floor was used for the estimation of the pig height using a regression equation. The weight was derived from the height combined with the projected area of the pig at the floor using a multiple regression equation. However, a difficulty of image analysis was remained when discriminating the pig image from the surroundings and the shadow lines.