python OpenCV检测所有具有预定义值的像素

import cv2

def detect_pixels(image, predefined_value):
    # 将图像转换为灰度图
    gray_image = cv2.cvtColor(image, cv2.COLOR_BGR2GRAY)
    
    # 获取图像的宽度和高度
    height, width = gray_image.shape
    
    # 遍历图像的每个像素
    for y in range(height):
        for x in range(width):
            # 获取当前像素的值
            pixel_value = gray_image[y, x]
            
            # 判断当前像素的值是否等于预定义值
            if pixel_value == predefined_value:
                # 在控制台输出像素的位置和值
                print(f"Pixel at ({x}, {y}) has predefined value: {pixel_value}")

# 读取图像
image = cv2.imread('image.jpg')

# 定义预定义值
predefined_value = 255

# 调用检测函数
detect_pixels(image, predefined_value)