图像处理笔记（4）---- OpenCV 对象追踪

尝试找到一种方法来提取多个彩色对象，例如，同时提取红色，蓝色，绿色对象。

import cv2 as cv
import numpy as np

cap = cv.VideoCapture(0)
while (1):
    #读取帧
    _,frame = cap.read()
    #转换颜色空间BGR到HSV
    hsv = cv.cvtColor(frame, cv.COLOR_BGR2HSV)
    # #定义HSV中蓝色的范围
    lower_blue = np.array([100, 50, 50])
    upper_blue = np.array([124, 255, 255])
    # #定义HSV中红色的范围
    lower_red = np.array([156, 50, 50])
    upper_red = np.array([180, 255, 255])
    #定义HSV中绿色的范围
    lower_green = np.array([35, 50, 50])
    upper_green = np.array([77, 255, 255])
    #设置HSV的阈值使得只取蓝色
    mask_blue = cv.inRange(hsv, lower_blue, upper_blue)
    mask_red = cv.inRange(hsv, lower_red, upper_red)
    mask_green = cv.inRange(hsv, lower_green, upper_green)
    
    #将掩膜和图像逐像素相加
    res_blue = cv.bitwise_and(frame, frame, mask= mask_blue)
    res_red = cv.bitwise_and(frame, frame, mask= mask_red)
    res_green = cv.bitwise_and(frame, frame, mask= mask_green)
    res_blue_red = cv.add(res_blue,res_red)
    res = cv.add(res_blue_red,res_green)
    cv.imshow('frame',frame)
    cv.imshow('mask_blue',mask_blue)
    cv.imshow('mask_red',mask_red)
    cv.imshow('mask_green',mask_green)
    cv.imshow('res_blue',res_blue)
    cv.imshow('res_red',res_red)
    cv.imshow('res_green',res_green)
    cv.imshow('res',res)
    k = cv.waitKey(5)&0xFF
    if k == 27:
        break
cv.destroyAllWindows()