以高速攝影機與慣性感測器對游泳划手技術分析之探討

Analysis of Swimming Stroke by using Image Technology and Inertia Sensor

划手是游泳選手透過上肢進行加速的動作，也是在水中前進的主要動力，藉由調整選手划手的連貫性、穩定性、與划手頻率能夠評估出選手的運動表現。以往游泳動作評估主要仰賴水中攝影機之影像分析，近年來無線慣性感測裝置已逐漸應用於游泳動作中並透過量化數據分析動作。本文以論述性方式呈游泳划手的運科發展，將分為兩部分：一、透過高速攝影機影像對游泳划手的人工分析，二、透過感測器對游泳划手的量化數據分析。文獻分析結果發現，游泳的運動表現受游泳划手的動作穩定性影響，選手除了在穩定每次划手的相似度外，亦須維持划手的頻率，而動作的連貫性亦是重要的關鍵因素，選手在進行游泳最大運動表現下可能會因情境不同而採取不同的動作策略，如何透過模擬賽場情境進行游泳划手檢測與動作評估，或利用無線慣性感測裝置進行運動表現測量，以更貼近實際狀況，增加對游泳動作評估的研究價值。

Swimming is a sport that attach importance to skill and speed. Different from the movement on land, swimming has formed four common swimming styles by the special environment. These styles are butterfly stroke, backstroke, breaststroke, and crawl swimming. There are also some differences between these strokes. In swimming evaluations, the consistency and stability are one of the indicators of swimmers' performance. Stroke is the acceleration of swimmers through their upper limbs, and it is also the main driving force in the water. The performance of swimming can be evaluated by the consistency, stability, and frequency of the strokes. In the past, the evaluation of swimming mainly depended on the image analysis of underwater cameras. In recent years, due to the rapid development of science and technology, wireless inertial sensor has been gradually applied to swimming and the swimming movement has analysis by the quantitative data. This article presents the development of swimming strokes in two parts. First, the image technology of swimming through artificial analysis. Second, the inertia sensor of swimming through quantitative data analysis. The result shows that the performance of swimming is affected by the stability of the swimmer's strokes. In addition, the swimmer should stabilize the of each stroke in similarity, also maintain the frequency of the strokes, and the consistency of the stroke is also an important factor to the performance. In the maximum performance of swimming, players may adopt different action strategies according to different situations. How to detect and evaluate the swimmer's movement by simulating the competition situation or use the wireless inertial sensor to measure the movement performance, in order to be closer to the actual situation and increase the research value of the swimming movement evaluation, is the main goal of the academic circles at present.