Opencv对象追踪的示例代码

1 HSV上下限

颜色的HSV上下限如下表：

2 追踪单个颜色

import cv2 as cv
import numpy as np

cap = cv.VideoCapture(0)
lower_color = np.array([0, 43, 46])
upper_color = np.array([10, 255, 255])
while cap.isOpened():
  # 读取帧
  _, frame = cap.read()
  # 转换颜色空间 BGR 到 HSV
  hsv = cv.cvtColor(frame, cv.COLOR_BGR2HSV)
  # 设置HSV的阈值使得只取某色
  mask = cv.inRange(hsv, lower_color, upper_color)
  # 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)
  if cv.waitKey(1) == ord("q"):
    break
cv.destroyAllWindows()

结果如下：

2 追踪多个颜色

import cv2 as cv
import numpy as np

cap = cv.VideoCapture(0)
lower_red = np.array([0, 43, 46])
upper_red = np.array([10, 255, 255])
lower_blue = np.array([100, 43, 46])
upper_blue = np.array([124, 255, 255])
while cap.isOpened():
  _, frame = cap.read()
  hsv = cv.cvtColor(frame, cv.COLOR_BGR2HSV)
  mask1 = cv.inRange(hsv, lower_red, upper_red)
  mask2 = cv.inRange(hsv, lower_blue, upper_blue)
  mask = mask1 + mask2
  res = cv.bitwise_and(frame, frame, mask=mask)
  # cv.imshow('frame', frame)
  cv.imshow('mask', mask)
  cv.imshow('res', res)
  if cv.waitKey(1) == ord("q"):
    break
cv.destroyAllWindows()

参考文献：

【1】OpenCV中HSV颜色模型及颜色分量范围