Matsuura Akihiro, Torii Suzuka, Ojima Yuki, Kiku Yoshio
Department of Animal Science, School of Veterinary Medicine, Kitasato University, Aomori 034-8628, Japan.
Department of Sustainable Agriculture, College of Agriculture, Food and Environment Sciences, Rakuno Gakuen University, Hokkaido 069-8501, Japan.
J Equine Sci. 2024 Mar;35(1):1-7. doi: 10.1294/jes.35.1. Epub 2024 Mar 19.
Although there have been advances in the technology for measuring horse body size with stereoscopic three-dimensional (3D) scanners, previously reported methods with a single scanner still face a significant challenge: the time necessary for scanning is too long for the horses to remain stationary. This study attempted to scan the horse simultaneously from four directions using four scanners in order to complete the scans in a short amount of time and then combine the images from the four scans on a computer into one whole image of each horse. This study also compared body measurements from the combined 3D images with those taken from conventional manual measurements. Nine riding horses were used to construct stereoscopic composite images, and the following 10 measurements were taken: height at the withers, back, and croup; chest depth; width of the chest (WCh), croup, and waist; girth circumference, cannon circumference (CaC), and body length. The same 10 measurements were taken by conventional manual methods. Relative errors ranged from -1.89% to 7.05%. The correlation coefficient between manual and 3D measurements was significant for all body measurements (P<0.01) except for WCh and CaC. A simple regression analysis of all body measurements revealed a strong correlation (P<0.001, R=0.9994, root-mean-square error=1.612). Simultaneous scanning with four devices from four directions reduced the scanning time from 60 sec with one device to 15 sec. This made it possible to perform non-contact body measurements even on incompletely trained horses who could not remain stationary for long periods of time.
尽管在使用立体三维（3D）扫描仪测量马匹体型的技术方面已有进展，但先前报道的单台扫描仪方法仍面临重大挑战：扫描所需时间过长，马匹难以保持静止。本研究尝试使用四台扫描仪从四个方向同时对马匹进行扫描，以便在短时间内完成扫描，然后在计算机上将四次扫描的图像合并成每匹马的完整图像。本研究还将合并后的3D图像的身体测量数据与传统手动测量的数据进行了比较。使用九匹骑乘马构建立体合成图像，并进行了以下10项测量：肩隆、背部和臀部的高度；胸深；胸部宽度（WCh）、臀部和腰部宽度；胸围、管围（CaC）和体长。通过传统手动方法进行了相同的10项测量。相对误差范围为-1.89%至7.05%。除WCh和CaC外，所有身体测量的手动测量与3D测量之间的相关系数均具有显著性（P<0.01）。对所有身体测量进行的简单回归分析显示出很强的相关性（P<0.001，R=0.9994，均方根误差=1.612）。使用四台设备从四个方向同时扫描将扫描时间从使用一台设备时的60秒减少到了15秒。这使得即使是对无法长时间保持静止的未完全训练的马匹也能够进行非接触式身体测量。
