我有一个学校项目，在该项目中，我必须制作一条跟车路线，必须根据用户输入遵循特定的颜色线。当我仅用一种颜色并且没有用户输入来测试汽车的路线跟随能力时，该代码就可以正常工作，但是当我添加多种颜色和用户输入时，汽车不再希望遵循一条路线而只是驶入日落。我试图尝试代码，但没有运气。这是代码的while循环。

try: while(True): user = int(input("1 for blue line")) time.sleep(1)

    ret, frame = cap.read()

    crop_img = frame[60:120, 0:160]

    _, img = cap.read()

    hsv = cv2.cvtColor(img, cv2.COLOR_BGR2HSV)

Tracking blue color

    if user == 1:
        blue_lower = np.array([99,115,150],np.uint8)
        blue_upper = np.array([110,255,255],np.uint8)
        blue = cv2.inRange(hsv, blue_lower, blue_upper)
        kernal = np.ones((5 ,5), "uint8")
        blue=cv2.dilate(blue,kernal)
        res=cv2.bitwise_and(img, img, mask = blue)

        (contours,hierarchy)=cv2.findContours(blue,cv2.RETR_TREE,cv2.CHAIN_APPROX_SIMPLE)

        for pic, contour in enumerate(contours):
            area = cv2.contourArea(contour)
            if(area>300):

                    x,y,w,h = cv2.boundingRect(contour)
                    img = cv2.rectangle(img,(x,y),(x+w,y+h),(255,0,0),2)

        Controls()

Tracking black color

    else:
        black_lower = np.array([0,0,0],np.uint8)
        black_upper = np.array([50,50,100],np.uint8)
        black = cv2.inRange(hsv, black_lower, black_upper)
        kernal = np.ones((5 ,5), "uint8")
        black = cv2.dilate(black,kernal)
        res2 = cv2.bitwise_and(img, img, mask = black)

        (contours,hierarchy)=cv2.findContours(black,cv2.RETR_TREE,cv2.CHAIN_APPROX_SIMPLE)

        for pic, contour in enumerate(contours):
            area = cv2.contourArea(contour)
            if(area>300):

                    x,y,w,h = cv2.boundingRect(contour)
                    img = cv2.rectangle(img,(x,y),(x+w,y+h),(255,0,0),2)

        Controls()