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Development of a System for Pig Weight Measurement by Image Analysis

通过图像分析开发猪体重测量系统

基本信息

批准号：
11660263
负责人：
MINAGAWA Hideo
金额：
$ 2.3万
依托单位：
Kitasato University
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (C)
财政年份：
1999
资助国家：
日本
起止时间：
1999 至 2001
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-11660263/
关键词：
Pig Weight Image Analysis Projected Area Height Light Projection

项目摘要

To estimate pig weight by a hand-off method, we made a device composed of a video camera and a mesh imaged slide projector.Analysis proceeded from the image of a pig in a pen, when projecting shadow lines of lattice pattern on the pig from above with the slide projector placed at the ceiling above the waterer and taking image of the pig with the video camera fixed beside the projector. From the image of the pig, the gap in pixel of a shadow line at the border between the shoulder and the floor of the booth was measured and related with height. The specified projected image area of the pig, which lacked the image area of ears and a tail, was also measured. Then pig weight was estimated from an exponential function of the area and the height and was compared with the measured one. For the litter of 12 growing pigs in the pen, experiments to estimate pig weight were done at five times during an age of 81 days to that of 98 days. The device set at the ceiling provided a clear image of a pig standing in a normal posture while drinking water.A mean relative error of 2.1% with 1.8% in standard deviation was obtained when estimate each pig weight. The fluctuation of error to estimate pig weight was remained, however, the device had a good prediction for the group weight of the pigs. The difference between estimated and measured mean group weights was only +0.3 kg, or 0.8% in relative error. Despite overestimating in positive side, it indicates a practical accuracy. Although a limitation in reliability to estimate pig weight remains, the method allows for rapid estimation of the weight

为了用交接法估算生猪体重，我们制作了一种由摄像机和网状成像投影仪组成的装置，对围栏中的猪的图像进行分析，将投影仪放置在饮水机上方的天花板上，从上方将格子图案的阴影线投射到猪身上，并在投影机旁边安装摄像机拍摄猪的图像。从猪的图像中，测量了展位肩部与地板交界处一条阴影线的像素间隙，并与高度相关。还测量了缺少耳朵和尾巴的图像区域的猪的指定投影图像区域。然后根据面积和身高的指数函数估计猪的体重，并与实测值进行比较。对圈养的12头生长猪，在81日龄至98日龄期间，进行了5次估计体重的试验。放置在天花板上的装置提供了猪在喝水时以正常姿势站立的清晰图像，在估计每头猪的体重时，平均相对误差为2.1%，标准偏差为1.8%。估计猪体重的误差波动不大，但该装置对猪的群体体重有较好的预测效果。估计的平均群体重量与测量的平均群体重量之间的差异仅为+0.3公斤，相对误差为0.8%。尽管高估了积极的一面，但它表明了实际的准确性。尽管估计生猪体重的可靠性仍然有限，但该方法允许快速估计体重。