#coding=utf-8
#HSV转换（颜色提取）

import cv2
import numpy as np

cap = cv2.VideoCapture(0)

while (1):
 _, frame = cap.read()
 hsv = cv2.cvtColor(frame, cv2.COLOR_BGR2HSV)

 #在PS里用取色器的HSV
 psHSV = [112, 89, 52]
 diff = 40 #上下浮动值
 #因为PS的HSV（HSB）取值是：0~360、0~1、0~1，而OpenCV的HSV是：0~180、0~255、0~255，所以要对ps的hsv进行处理，H/2、SV*255
 lowerHSV = [(psHSV[0] - diff) / 2, (psHSV[1] - diff) * 255 / 100,
    (psHSV[2] - diff) * 255 / 100]
 upperHSV = [(psHSV[0] + diff) / 2, (psHSV[1] + diff) * 255 / 100,
    (psHSV[2] + diff) * 255 / 100]

 mask = cv2.inRange(hsv, np.array(lowerHSV), np.array(upperHSV))

 #使用位“与运算”提取颜色部分
 res = cv2.bitwise_and(frame, frame, mask=mask)
 #使用高斯模式优化图片
 res = cv2.GaussianBlur(res, (5, 5), 1)

 cv2.imshow('frame', frame)
 # cv2.imshow('mask', mask)
 cv2.imshow('res', res)
 if cv2.waitKey(1) & 0xFF == ord('q'):
  break

cv2.destroyAllWindows()