A non-contact method for detecting physiological signals and motion in real time comprises: sensing a portion of a human body to generate a series of image frames by an optical sensing element； determining a complexion region from each of the image frames； then calculating a central coordinate of the complexion region； expanding a specific range from the central coordinate to the surrounding thereof, to determine a sample block, and get a complexion change waveform of the sample block； comparing the central coordinate of the image frame with a central coordinate of a later image frame, to calculate a displacement in a unit time； and determining whether the portion of the human body is in a static state according to the displacement. In the static state, an operating unit performs noise filter and peak detecting for complexion change waveform, and calculates a physiological signal. Therefore, said method can reduce the amount of data required to be processed in physiological signal detection, and improve the accuracy of physiological signal detection.一種非接觸式即時生理訊號及動作偵測方法，以一光感測元件感測一人體部位，而產生一連串的影像框；從每一影像框中區分出一膚色區域，接著從膚色區域中計算一中心座標；從中心座標向四周擴張一特定範圍而形成一取樣區塊，並偵測此取樣區塊的膚色變化波形；比對此影像框的中心座標與其後的影像框的中心座標的位置，而計算出一單位時間內的位移；以此位移判斷人體部位是否處於一靜止狀態。在靜止狀態時，運算單元才會進行膚色變化波形的雜訊濾除及波峰偵測，並且計算一生理訊號。因此上述方法可降低偵測生理訊號的過程所需處理的資料量，亦可提高生理訊號量測的精準度。
