opencv识别特定颜色（任意照片）

# 识别特定的颜色
# 识别特定的颜色
import cv2 as cv
import matplotlib.pyplot as plt
import tkinter as tk
from tkinter import filedialog
import numpy as np

root = tk.Tk()
root.withdraw()
file_path = filedialog.askopenfilename()
img = cv.imread