如何使用OpenCV查找图像中红色的区域?

    img = cv2.imread(r'E:/work/youweiji_dushu/oil_data/2013_8_27_201382744358.jpg')
    img_hsv = cv2.cvtColor(img, cv2.COLOR_BGR2HSV)

    ## Gen lower mask (0-5) and upper mask (175-180) of RED
    mask1 = cv2.inRange(img_hsv, (0,50,20), (5,255,255))
    mask2 = cv2.inRange(img_hsv, (175,50,20), (180,255,255))

    ## Merge the mask and crop the red regions
    mask = cv2.bitwise_or(mask1, mask2 )
    croped = cv2.bitwise_and(img, img, mask=mask)

    ## Display
    cv2.imshow("mask", mask)
    cv2.imshow("croped", croped)
    cv2.waitKey()