如何使用opencv将图像划分为8x8块并将其合并回来？

import cv2

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

height, width = image.shape[:2]

block_size = 8
blocks = []
for i in range(0, height, block_size):
    for j in range(0, width, block_size):
        block = image[i:i+block_size, j:j+block_size]
        blocks.append(block)

processed_blocks = []
for block in blocks:
    # 这里可以应用任何图像处理算法，例如调整亮度、对比度等
    processed_block = block  # 假设这里不进行任何处理，直接将块返回
    processed_blocks.append(processed_block)

merged_image = None
for i in range(0, len(processed_blocks), width//block_size):
    row = np.concatenate(processed_blocks[i:i+width//block_size], axis=1)
    if merged_image is None:
        merged_image = row
    else:
        merged_image = np.concatenate((merged_image, row), axis=0)

cv2.imshow("Merged Image", merged_image)
cv2.waitKey(0)
cv2.destroyAllWindows()