OpenCV 物体追踪蓝色

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 HSVhsv = cv.cvtColor(frame, cv.COLOR_BGR2HSV)# 定义HSV中蓝色的范围lower_blue = np.array([100,43,46])upper_blue = np.array([124,255,255])# 设置HSV的阈值使得只取蓝色mask = cv.inRange(hsv, lower_blue, upper_blue)contours,_ = cv.findContours(mask, cv.RETR_EXTERNAL, cv.CHAIN_APPROX_SIMPLE)for c in contours:if cv.contourArea(c) > 1000:(x, y, w, h) = cv.boundingRect(c)  # 该函数计算矩形的边界框cv.rectangle(frame, (x, y), (x + w, y + h), (0, 255, 255), 2)# 将掩膜和图像逐像素相加res = cv.bitwise_and(frame,frame, mask= mask)cv.imshow('frame',frame)cv.imshow('mask',mask)cv.imshow('res',res)k = cv.waitKey(5) & 0xFFif k == 27:break
cv.destroyAllWindows()