我正在尝试使用滑块来控制 HSV 掩码的下限和上限。我能够得到滑块,但不能让它保持我设定的位置;每次拉入新框架时,它都会一直回到零。
import numpy as np
import cv2
def nothing(x):
pass
cap = cv2.VideoCapture(0)
while(True):
# Make a window for the video feed
cv2.namedWindow('frame',cv2.CV_WINDOW_AUTOSIZE)
# Capture frame-by-frame
ret, frame = cap.read()
# Make the trackbar used for HSV masking
cv2.createTrackbar('HSV','frame',0,255,nothing)
# Name the variable used for mask bounds
j = cv2.getTrackbarPos('HSV','image')
# Convert BGR to HSV
hsv = cv2.cvtColor(frame, cv2.COLOR_BGR2HSV)
# define range of color in HSV
lower = np.array([j-10,100,100])
upper = np.array([j+10,255,255])
# Threshold the HSV image to get only selected color
mask = cv2.inRange(hsv, lower, upper)
# Bitwise-AND mask the original image
res = cv2.bitwise_and(frame,frame, mask= mask)
# Display the resulting frame
cv2.imshow('frame',res)
# Press q to quit
if cv2.waitKey(3) & 0xFF == ord('q'):
break
# When everything is done, release the capture
cap.release()
cv2.destroyAllWindows()