近幾年來全球興起健康休閒風潮，而人們每天都會穿著鞋子進行各式各樣的活動，因此如果穿到不合適的鞋子，長時間下來可能會導致疼痛甚至是引發疾病。而使用足部掃描器能有效快速的得到足部資訊，讓販售鞋子的店家以此挑選出適合客人足部的鞋子。本研究期望足部掃描器能夠普及運用，因此開發了一套足部掃描系統，其利用線雷射和攝影機搭配三角幾何測距法，同時使用線性馬達帶動掃描模組，在6秒鐘左右時間即可掃描完成足部3D外觀。
本研究採用標準撞球來驗證掃描器性能，實驗結果證明掃描器對於半徑28.575mm的標準撞球而言，長度尺寸誤差是小於0.692mm，相對誤差小於2.422%。此外，本研究亦驗證掃描機的資料重現性，實驗結果顯示重複性的距離平均誤差約可小於0.06mm。最後，並六位受測者的實際測量驗證本研究之可行性。

In recent years, health and leisure issues are getting popular. People always need to wear shoes for their daily life in many kinds of activities. It may cause foot pain due to wearing unsuitable shoes for a long period, as well as foot deformity or some diseases. 3D foot scanner can rapidly obtain foot surface data. Thus, these data let shoe-store providing much suitable and comfortable shoes for their customer. This paper tries to develop a universal 3D foot scanner. Therefore, we design 3D scanning system for measuring foot. This device utilizes line-lasers and cameras based on triangular method. It totally has three scanning modules that composed with a line laser and a camera individually. Therefore, it is able to cover a complete region of one foot. Besides, these scanning modules move along a linear stage to scan a foot within 6 sec.
We valuated the performance of our 3D foot scanning system by measuring a cue ball of billiard. The true radius of the cue ball is 28.575mm, and the measurement error is less than 0.692mm. Therefore, the relative error is less than 2.422%. Moreover, we verified the repeatability for scanning a foot. The result shows the repeatability error in distance between two different scan is less than 0.06mm. Finally, we further test scan for six testers to verify the feasibility.

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