Opencv - closely combine multiple irregular small graphs into large graphs

Closely combine multiple irregular small graphs into large graphs , This is a packaging problem , Optimization solution , It is difficult to find the optimal solution .Trick programme ： Arrange the images from large to small , Spiral arrangement , To achieve suboptimal .

for example , Arrange multiple cells closely ：

Source code ：

def merge_dense_patches(img_list):
    """  Closely arranged irregular small pieces  """
    print('[Info]  Number of stitched images : {}'.format(len(img_list