Accuracy of food portion size estimation from digital pictures acquired by a chest-worn camera.
Accuracy of food portion size estimation from digital pictures acquired by a chest-worn camera.
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DOI：
10.1017/s1368980013003236
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发表时间：
2014-08
影响因子：
3.2
通讯作者：
Sun, Mingui
中科院分区：
文献类型：
--
作者：
Jia, Wenyan;Chen, Hsin-Chen;Yue, Yaofeng;Li, Zhaoxin;Fernstrom, John;Bai, Yicheng;Li, Chengliu;Sun, Mingui
食物分量的准确估计在膳食研究中至关重要。我们开发了一种名为eButton的小型胸戴式电子设备，可自动拍摄所食用食物的照片，以进行客观的饮食评估。根据所获取的图片，可以在计算机软件的帮助下半自动地计算食物份量。本研究的目的是评估从eButton图片计算的食物份量（体积）的准确性。参与者在午餐时佩戴了一个eButton。使用软件计算每个eButton图片中的食物体积。为了进行比较，三名评分员通过查看相同的图片来估计食物体积。实际体积通过使用种子置换的物理测量来确定。研究实验室的餐厅和办公室。七名实验室志愿者。收集了100个食物样品（50个西方食物和50个亚洲食物）的图像，并使用软件从这些图像中估计每个食物的体积。所有样本的估计体积和实际体积之间的平均相对误差为− 2.8%（95%CI − 6.8%，1.2%），SD为20.4%。对85个样品，计算机测定的食物体积与实际物理测量结果的差异不超过30%。当计算机和评分员对体积的估计进行比较时，计算机估计显示出更小的偏差和变异性。从相同的eButton图片，基于计算机的方法提供了比视觉估计方法更客观和准确的食物体积估计。
Accurate estimation of food portion size is of paramount importance in dietary studies. We have developed a small, chest-worn electronic device called eButton which automatically takes pictures of consumed foods for objective dietary assessment. From the acquired pictures, the food portion size can be calculated semi-automatically with the help of computer software. The aim of the present study is to evaluate the accuracy of the calculated food portion size (volumes) from eButton pictures. Participants wore an eButton during their lunch. The volume of food in each eButton picture was calculated using software. For comparison, three raters estimated the food volume by viewing the same picture. The actual volume was determined by physical measurement using seed displacement. Dining room and offices in a research laboratory. Seven lab member volunteers. Images of 100 food samples (fifty Western and fifty Asian foods) were collected and each food volume was estimated from these images using software. The mean relative error between the estimated volume and the actual volume over all the samples was −2.8 % (95 % CI −6.8 %, 1.2%) with SD of 20.4 %. For eighty-five samples, the food volumes determined by computer differed by no more than 30 % from the results of actual physical measurements. When the volume estimates by the computer and raters were compared, the computer estimates showed much less bias and variability. From the same eButton pictures, the computer-based method provides more objective and accurate estimates of food volume than the visual estimation method.