瞭解不同人體活動的能量消耗可以幫助人們做出適當的運動鍛鍊計畫。本論文提出一種基於深度攝影機的人體活動能量消耗估測系統，使用此系統不需要配戴任何裝置，其中運動姿態可以區分站立、行走和跑步，經由此系統可以依據不同的運動姿態估算人體活動的能量消耗。
在這項研究中，招募了21名受試者參加人體活動的能量消耗實驗。藉由深度攝影機獲取的受試者骨骼數據，進行不同運動姿態的分類，並且對應到氣體分析器所獲得的受試者代謝當量，以建立人體活動的能量消耗估測系統。為了準確達到能量消耗的估測，本研究在受試者的側邊、斜後方和後方各設置一台深度攝影機，通過比較不同的預測模型搭配不同位置的攝影機資料，根據站立、行走和跑步三種運動姿態，分別估測受試者的人體活動所消耗的能量。
透過數次的實驗，多層感知器是最適合建立各種人體活動能量消耗估計系統的預測模型，搭配側邊的攝影機資料可以獲得最低的平均絕對誤差值，亦即MAE= 0.54。而在三個人體活動分別建立三個相對應的能量消耗估測系統中，多層感知器搭配後方的攝影機在跑步運動的估測中具有最佳的結果，而在站立和行走兩種運動姿態，該系統則是以卷積神經網路搭配後方攝影機資料能獲得最佳估測結果，其中站立的MAE=0.14，行走的MAE=0.46，而跑步的MAE=0.65。根據實驗結果顯示，此研究提供一個可靠的系統，讓受試者能夠使用最方便且簡單的方式來監控自身運動時的能量消耗。

The energy expenditure of different physical activities can help people make proper exercise planning. In this thesis, we develop an estimation system for energy expenditure of physical activities captured by depth cameras. In this system, users need not wear any devices while doing the workouts. The system can first classify the postures of standing, walking, and running, then estimate energy expenditure based on different physical activities postures.
In this study, 21 subjects were recruited to participate in energy expenditure experiments in physical activities. Subject's skeletal data acquired by the depth camera are used to classify different physical activities postures, and subject's metabolic equivalents are obtained from a gas analyzer to establish the estimation system for energy expenditure of physical activities. In order to accurately estimate the energy expenditure, this study sets up three depth cameras on the side, rear right, and rear of the subject. Then compare the energy expenditure according to the postures of standing, walking, and running by various regression prediction models with the data captured by different cameras.
Through many experiments, the multilayer perceptron (MLP) is the most suitable predictive model for establishing the estimation system for energy expenditure of a combined physical activity. The lowest mean absolute error (MAE) can be obtained by an MLP with the camera data on the side, which is MAE = 0.54. When examining one of three physical activities (standing, walking, and running) by virtue of our proposed estimation system individually, the MLP with rear data has the best result for running postures (MAE = 0.65), and a convolutional neural network with rear data for standing posture (MAE = 0.14) and walking posture (MAE = 0.46) has the best result. According to the experimental results, our study can provide a reliable system that allows the subject to monitor the energy expenditure during the exercise in the most convenient and simple way.

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