问题描述
I would like to track white color using webcam and python opencv. I already have the code to track blue color.
_, frame = cap.read() hsv = cv2.cvtColor(frame, cv2.COLOR_BGR2HSV) # define range of blue color in HSV lower_blue = np.array([110,100,100]) upper_blue = np.array([130,255,255]) #How to define this range for white color # Threshold the HSV image to get only blue colors mask = cv2.inRange(hsv, lower_blue, upper_blue) # Bitwise-AND mask and original image res = cv2.bitwise_and(frame,frame, mask= mask) cv2.imshow('frame',frame) cv2.imshow('mask',mask) cv2.imshow('res',res)
what values should I give as lower bound and upper bound to track white color!!?? I tried changing values and I got other colors but no luck with the white color!!!
is that HSV values or BGR values specified as lower and upper bounds???
PS : I must get the last result as a binary image for further processing!!
Please help me !!!
解决方案
I wrote this for tracking white color :
import cv2 import numpy as np cap = cv2.VideoCapture(0) while(1): _, frame = cap.read() hsv = cv2.cvtColor(frame, cv2.COLOR_BGR2HSV) # define range of white color in HSV # change it according to your need ! lower_white = np.array([0,0,0], dtype=np.uint8) upper_white = np.array([0,0,255], dtype=np.uint8) # Threshold the HSV image to get only white colors mask = cv2.inRange(hsv, lower_white, upper_white) # Bitwise-AND mask and original image res = cv2.bitwise_and(frame,frame, mask= mask) cv2.imshow('frame',frame) cv2.imshow('mask',mask) cv2.imshow('res',res) k = cv2.waitKey(5) & 0xFF if k == 27: break cv2.destroyAllWindows()
I tried to track the white screen of my phone and got this :
You can try changing the HSV values You might also try HSL color space as Legat said, it would be more accurate