原图：

分块结果：

拼接结果：

代码：

import numpy as np
import cv2 as cv
import matplotlib.pyplot as plt


def get_patch(img,patch_size):
    imgs = []
    h,w,n = img.shape
    new_h, new_w = patch_size, patch_size
    col=int(w/patch_size)+1
    row=int(h/patch_size)+1
    patch_n=col*row
    top=0

    for r in range(row):
        foot=top+new_h
        if foot>h:foot=h
        left=0
        for c in range(col):
             right=left+new_w
             if right >w:right=w
             img_patch =img[top:foot,left:right]
             left = left + new_w+1
             imgs.append(img_patch)
             # a[r][c].imshow(img_patch)
        top = top + new_h+1
    # plt.show()
    return imgs,row,col
def jointImage(imgs,h_n,w_n,):
    for h in range(h_n):
        # 按行拼接
        for w in range(w_n):
            # 按列拼接
            if w==0:
               imgs_c=np.array(imgs[h*w_n+w])
            else:
               img_c=np.array(imgs[h*w_n+w])
               imgs_c=np.hstack((imgs_c,img_c))
            print(imgs[h * w_n + w].shape)
        if h==0:
            imgs_h=imgs_c
        else:
            imgs_h=np.vstack((imgs_h,imgs_c))
    return imgs_h

img=cv.imread('./SIDD-Small Dataset/SIDD_Small_sRGB_Only/SIDD_Small_sRGB_Only/Data/0001_001_S6_00100_00060_3200_L/GT_SRGB_010.PNG')
imgs,h_n,w_n=get_patch(img,1024)
plt.rcParams["figure.figsize"] = [10, 8]
fig, axes = plt.subplots(nrows=h_n, ncols=w_n)
num=0
for r in range(h_n):
    for c in range(w_n):
        axes[r, c].imshow(imgs[num])
        num+=1
# plt.tight_layout()
plt.subplots_adjust(bottom=-.1, right=0.5, top=.8)
plt.show()
full_img=jointImage(imgs,h_n,w_n)
plt.title('full_img')
plt.imshow(full_img)
plt.show()