- 學位論文
模糊隱藏馬可夫模型於溺水辨識之研究
The Study of Fuzzy Hidden Markov Models for Drowning Recognition
摘要
生命安全為人類在從事水上活動中最重要的，游泳池都會安排一個救生員在旁待命。到目前為止，市面上還是沒有一套輔助救生員的系統，主要是在溺水辨識上的準確率會有很多問題產生。因此，運用機器視覺的研究方法，來解析其問題的困難點與因應之道，為本研究之主要目的。本研究是經由監視器截取畫面，之後再用群聚演算法、高斯混合模型、模糊隱藏式馬可夫模型等方法，來建立一套完整的溺水辨識系統，進而做到溺水徵兆的警報及保障游泳者的生命安全。經由上述之方法，實作姿態辨識使用游泳者的四個特徵，其為游泳者的橢圓比例、游泳者的面積大小、游泳者的移動速度及游泳者的移動方向，最後在模擬游泳池與真實游泳池作驗證，模擬游泳池只有一個模擬游泳者，得到游泳者偵測率為91%，而游泳者辨識率為88%，真實游泳池有四個游泳者，得到游泳者偵測率為93%，而游泳者辨識率為80%，一旦偵測到溺水情形則發出警報，以減少因救生員沒注意所造成的溺水時間延長及提高存活率。游泳池中存在著許多值得研究之議題，本研究除了針對溺水辨識進行探討外，也可辨識出其他六種游泳行為（自由式、蛙式、蝶式、仰式、仰漂、水中行走），然而運用同樣之方法流程可探究出更多的辨識問題與提出解決方案。
並列摘要
The safety of human life is the most important in water activities, so a lifeguard will be arranged the swimming pool to stand by. So far, due to the lack of a lifeguard auxiliary system in the market, the mainly drowning of the accuracy of identification have a lot of problems. Therefore, the use of machine vision research methods, is to resolve their problems. The difficulties of coping point is the main purpose of this study. This study was intercepted by surveillance aircraft screen, and then after the clustering algorithm, Gaussian mixture model, fuzzy hidden Markov models and other methods to create a complete set of drowning recognition system, and further sent a sign of warning and protection of drowning swimming lives. By the above method to implement gesture recognition, we use the swimmer's four characteristics, the ratio of the ellipse for the swimmers, swimmer's size, swimmer's speed and direction of movement of swimmers, at the last compare in a simulated swimming pool and real for verification. Simulation is only a simulated pool swimmer to get swimmer detection rate of 91%, while the swimmer recognition rate of 88%. The real pool of four swimmers gets swimmers detection rate of 95%, while swimming 80% were identified. Once the situation of drowning is detected, an alarm signal will be sent right away, in order to reduce the possibility that lifeguards fail to notice the result of drowning and prolong survival time. Swimming pools, where many issues are worthy of research, this study discusses not only the recognition for the drowning, but also to identify other six swimming behaviors (freestyle, breaststroke, butterfly, backstroke, backfloat, walking in the water). However, the same method can be used to explore the process of more identification problems and propose solutions.
參考文獻
延伸閱讀
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