如何使用OpenCV逐渐变亮图像的下边框？

import cv2
import numpy as np

def gradually_brighten_bottom_border(image, brightness_increase):
    # 转换图像为HSV颜色空间
    hsv_image = cv2.cvtColor(image, cv2.COLOR_BGR2HSV)

    # 获取图像的下边框坐标
    height, width = image.shape[:2]
    bottom_border = int(height * 0.9)  # 下边框的位置可以根据需求进行调整

    # 逐渐增加亮度
    for y in range(bottom_border, height):
        for x in range(width):
            hsv_image[y, x, 2] = min(hsv_image[y, x, 2] + brightness_increase, 255)

    # 转换回BGR颜色空间
    brightened_image = cv2.cvtColor(hsv_image, cv2.COLOR_HSV2BGR)

    # 显示图像
    cv2.imshow("Brightened Image", brightened_image)
    cv2.waitKey(0)
    cv2.destroyAllWindows()

# 加载图像
image = cv2.imread("image.jpg")

# 逐渐变亮，增加亮度值为10
gradually_brighten_bottom_border(image, 10)