# encoding=utf-8import datetimeimport imutilsimport timeimport cv2min_area = 500camera = cv2.VideoCapture(0)# 等待攝像頭準備好time.sleep(0.25)# 初始化視頻流的第一幀firstFrame = None# 遍歷視頻的每一幀while True: # 獲取幀并初始化occupied/unoccupied文本 (grabbed, frame) = camera.read() text = 'Unoccupied' # 調(diào)整該幀的大小,，轉換為灰階圖像并且對其進行高斯模糊 frame = imutils.resize(frame, width=500) gray = cv2.cvtColor(frame, cv2.COLOR_BGR2GRAY) gray = cv2.GaussianBlur(gray, (21, 21), 0) # 初始化第1幀 if firstFrame is None: firstFrame = gray continue # 差分 frameDelta = cv2.absdiff(firstFrame, gray) thresh = cv2.threshold(frameDelta, 25, 255, cv2.THRESH_BINARY)[1] # 形態(tài)學操作 膨脹 thresh = cv2.dilate(thresh, None, iterations=2) thresh, contours, hierarchy = cv2.findContours(thresh.copy(), cv2.RETR_EXTERNAL, cv2.CHAIN_APPROX_SIMPLE) # 遍歷輪廓 for c in contours: # if the contour is too small, ignore it print('area = %f ' % cv2.contourArea(c)) if cv2.contourArea(c) < min_area: continue # compute the bounding box for the contour, draw it on the frame, # and update the text # 計算輪廓的邊界框,，在當前幀中畫出該框 (x, y, w, h) = cv2.boundingRect(c) cv2.rectangle(frame, (x, y), (x + w, y + h), (0, 255, 0), 2) text = 'Occupied' # draw the text and timestamp on the frame # 幀上寫文字以及時間戳 cv2.putText(frame, 'Room Status: {}'.format(text), (10, 20), cv2.FONT_HERSHEY_SIMPLEX, 0.5, (0, 0, 255), 2) cv2.putText(frame, datetime.datetime.now().strftime('%A %d %B %Y %I:%M:%S%p'), (10, frame.shape[0] - 10), cv2.FONT_HERSHEY_SIMPLEX, 0.35, (0, 0, 255), 1) # 顯示幀 cv2.imshow('Security Feed', frame) cv2.imshow('Thresh', thresh) cv2.imshow('Frame Delta', frameDelta) key = cv2.waitKey(1) # q鍵跳出循環(huán) if key == ord('q'): break# 清理資源camera.release()cv2.destroyAllWindows()