如何使用opencv将透明背景图像转换为白色背景

import cv2
import numpy as np

image = cv2.imread('input_image.png', cv2.IMREAD_UNCHANGED)

if image.shape[2] == 4:
    has_alpha = True
else:
    has_alpha = False

if has_alpha:
    # 提取Alpha通道
    alpha_channel = image[:, :, 3]

    # 创建一个与图像大小相同的白色背景图像
    white_background = np.ones_like(image) * 255

    # 将Alpha通道应用于白色背景图像
    white_background[:, :, 3] = alpha_channel

    # 将白色背景图像转换为BGR格式
    white_background = cv2.cvtColor(white_background, cv2.COLOR_BGRA2BGR)

    # 保存结果图像
    cv2.imwrite('output_image.png', white_background)

else:
    cv2.imwrite('output_image.png', image)