Python Opencv轉換顏色空間 RGB轉為HSV

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舉個例子，通過攝像頭把視頻中的藍色區(qū)域凸顯出來，剩余的顏色均為黑色

import numpy as npcap = cv2.VideoCapture(0)while(1):# Take each frame_, frame = cap.read()# Convert BGR to HSVhsv = cv2.cvtColor(frame, cv2.COLOR_BGR2HSV)# define range of blue color in HSVlower_blue = np.array([110,50,50])upper_blue = np.array([130,255,255])# Threshold the HSV image to get only blue colorsmask = cv2.inRange(hsv, lower_blue, upper_blue)# Bitwise-AND mask and original imageres = cv2.bitwise_and(frame,frame, mask= mask)cv2.imshow('frame',frame)cv2.imshow('mask',mask)cv2.imshow('res',res)k = cv2.waitKey(5) & 0xFFif k == 27:breakcv2.destroyAllWindows()

效果

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任意RGB顏色轉為HSV例子

green = np.uint8([[[0,255,0 ]]]) hsv_green = cv2.cvtColor(green,cv2.COLOR_BGR2HSV) print hsv_green [[[ 60 255 255]]]

則綠色范圍為?[H-10, 100,100] 到 [H+10, 255, 255]

H為60

總結

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