python OpenCV实现调整画面的HSV

OpenCV 调整得到想要的颜色

import cv2
import numpy as np

cap = cv2.VideoCapture(0)#打开摄像头
pic=np.zeros((480, 640, 3),dtype=np.uint8)
def nothing():
    pass

cv2.namedWindow("HSV",0)
cv2.resizeWindow("HSV",500,300)
cv2.createTrackbar("H_L","HSV",0,180,nothing)
cv2.createTrackbar("S_L","HSV",0,255,nothing)
cv2.createTrackbar("V_L","HSV",0,255,nothing)
cv2.createTrackbar("H_U","HSV",0,180,nothing)
cv2.createTrackbar("S_U","HSV",0,255,nothing)
cv2.createTrackbar("V_U","HSV",0,255,nothing)

while cap.isOpened():
    _,frame = cap.read()
    if not _:
        break
    imgray = cv2.cvtColor(frame,cv2.COLOR_BGR2HSV)
    cv2.imshow("frame",frame)
    h_l = cv2.getTrackbarPos("H_L","HSV")
    s_l = cv2.getTrackbarPos("S_L","HSV")
    v_l = cv2.getTrackbarPos("V_L","HSV")
    h_u = cv2.getTrackbarPos("H_U","HSV")
    s_u = cv2.getTrackbarPos("S_U","HSV")
    v_u = cv2.getTrackbarPos("V_U","HSV")
    lower = np.array([h_l,s_l,v_l])
    upper = np.array([h_u,s_u,v_u])
    mask = cv2.inRange(imgray,lower,upper)
    img = cv2.add(frame,pic,mask=mask)
    cv2.imshow("img",img)
    k = cv2.waitKey(20) &0xff
    if k == 27:
        break