如何用OpenCV Python查找图像非白色区域的边界框

import cv2
import numpy as np

image = cv2.imread('image.jpg')

gray = cv2.cvtColor(image, cv2.COLOR_BGR2GRAY)

_, threshold = cv2.threshold(gray, 240, 255, cv2.THRESH_BINARY)

contours, _ = cv2.findContours(threshold, cv2.RETR_EXTERNAL, cv2.CHAIN_APPROX_SIMPLE)

bounding_boxes = []
for contour in contours:
    x, y, w, h = cv2.boundingRect(contour)
    bounding_boxes.append((x, y, w, h))

for (x, y, w, h) in bounding_boxes:
    cv2.rectangle(image, (x, y), (x + w, y + h), (0, 255, 0), 2)

cv2.imshow('Result', image)
cv2.waitKey(0)
cv2.destroyAllWindows()