我是OpenCV和Python的新手。我正在尝试使用摄像头实时检测颜色。我想在检测到红色、绿色或蓝色时设置一个“如果条件”。如果检测到红色，它应该打印“颜色是红色”。同样，我希望对绿色和蓝色也应用这种情况。这里有代码展示了单独的RGB颜色。是否有人可以帮我解决这个问题？提前感谢 🙂
import cv2import numpy as npimport matplotlib.pyplot as pltcap = cv2.VideoCapture(0)while True: _, frame = cap.read() hsv_frame = cv2.cvtColor(frame, cv2.COLOR_BGR2HSV) # Red color low_red = np.array([161, 155, 84]) high_red = np.array([179, 255, 255]) red_mask = cv2.inRange(hsv_frame, low_red, high_red) red = cv2.bitwise_and(frame, frame, mask=red_mask) # Blue color low_blue = np.array([94, 80, 2]) high_blue = np.array([126, 255, 255]) blue_mask = cv2.inRange(hsv_frame, low_blue, high_blue) blue = cv2.bitwise_and(frame, frame, mask=blue_mask) # Green color low_green = np.array([25, 52, 72]) high_green = np.array([102, 255, 255]) green_mask = cv2.inRange(hsv_frame, low_green, high_green) green = cv2.bitwise_and(frame, frame, mask=green_mask) # Every color except white low = np.array([0, 42, 0]) high = np.array([179, 255, 255]) mask = cv2.inRange(hsv_frame, low, high) result = cv2.bitwise_and(frame, frame, mask=mask)# plt.imshow(mask,cmap='gray')######## Chech if the shown object has red color or not ########## img_height, img_width, _=hsv_frame.shape for i in range(img_height): for j in range(img_width): if hsv_frame[i][j][1]>= low_red and hsv_frame[i][j][1]<=upper_red: print("Red found")# cv2.imshow("Red", red)# cv2.imshow("Blue", blue)# cv2.imshow("Green", green) if cv2.waitKey(1)==13: breakcap.release()cv2.waitKey(1)cv2.destroyAllWindows()我遇到的错误是
—> 40 if hsv_frame[i][j][1]>= low_red and hsv_frame[i][j][1]<=upper_red: ValueError: The truth value of an array with more than one element is ambiguous. Use a.any() or a.all()
回答：
这一行
if hsv_frame[i][j][1]>= low_red and hsv_frame[i][j][1]<=upper_red:比较了两个数组，即像素 (r,g,b) <= (r,g,b)，这将返回3个值，即 (True/False, True/False, True/False)。
因此，您需要使用以下之一：
any()（至少一个为真）
或者
all()（全部为真）
考虑到这是像素比较，我建议您使用all，
将其替换为下面的代码。
if (hsv_frame[i][j][1]>= low_red).all() and (hsv_frame[i][j][1]<=upper_red).all():