如何使用python从热图中移除白色边框

import cv2
import numpy as np

image = cv2.imread('heatmap.png')

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

_, threshold = cv2.threshold(gray, 200, 255, cv2.THRESH_BINARY)

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

max_contour = max(contours, key=cv2.contourArea)

mask = np.zeros_like(image)

cv2.drawContours(mask, [max_contour], -1, (255, 255, 255), thickness=cv2.FILLED)

result = cv2.bitwise_and(image, mask)

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