Python Numpy如何将数组/图像列表重塑为拼贴画? [英] Python numpy how to reshape this list of arrays/images into a collage?
问题描述
我有以下25张代表图案的微型黑白图像的列表:
I've got the following list of 25 mini black-and-white images representing patterns:
imgs.shape
(25, 3, 3, 1)
即有25种不同的3x3黑白图像模式.我想做的是创建一个包含这些3x3
块的5x5
的大图像,这有意义吗?如下所示:
I.e. there are 25 different 3x3 black and white image patterns. What I want to do is create a single large image that's 5x5
of these 3x3
blocks, does that make sense? Kind of like this below:
然后我的目的是要具有可以像这样显示和查看的形状(15, 15, 1)
.我正在将numpy和opencv与Python配合使用.希望为实时处理做一些非常有效的事情,所以我认为numpy的重塑可能是有道理的.
My intention is then to have something of shape (15, 15, 1)
that I can display and view like this. I'm using numpy and opencv with Python. Looking to do something quite efficient for real-time processing, so I thought numpy's reshape might make sense.
感谢您的帮助!
推荐答案
解决方案:
imgs.reshape(5, 5, 3, 3, 1).swapaxes(1, 2).reshape(15, 15, 1)
示例:
# test data
# each 3x3 image consists of the 9 identical digits
A = np.stack([
np.full((3, 3, 1), i)
for i in range(1, 26)
])
with_swap = A.reshape(5, 5, 3, 3, 1).swapaxes(1, 2).reshape(15, 15, 1)
print(with_swap[...,-1])
without_swap = A.reshape(15, 15, 1)
print(without_swap[...,-1])
使用交换:
[[ 1 1 1 2 2 2 3 3 3 4 4 4 5 5 5]
[ 1 1 1 2 2 2 3 3 3 4 4 4 5 5 5]
[ 1 1 1 2 2 2 3 3 3 4 4 4 5 5 5]
[ 6 6 6 7 7 7 8 8 8 9 9 9 10 10 10]
[ 6 6 6 7 7 7 8 8 8 9 9 9 10 10 10]
[ 6 6 6 7 7 7 8 8 8 9 9 9 10 10 10]
[11 11 11 12 12 12 13 13 13 14 14 14 15 15 15]
[11 11 11 12 12 12 13 13 13 14 14 14 15 15 15]
[11 11 11 12 12 12 13 13 13 14 14 14 15 15 15]
[16 16 16 17 17 17 18 18 18 19 19 19 20 20 20]
[16 16 16 17 17 17 18 18 18 19 19 19 20 20 20]
[16 16 16 17 17 17 18 18 18 19 19 19 20 20 20]
[21 21 21 22 22 22 23 23 23 24 24 24 25 25 25]
[21 21 21 22 22 22 23 23 23 24 24 24 25 25 25]
[21 21 21 22 22 22 23 23 23 24 24 24 25 25 25]]
不进行交换:
[[ 1 1 1 1 1 1 1 1 1 2 2 2 2 2 2]
[ 2 2 2 3 3 3 3 3 3 3 3 3 4 4 4]
[ 4 4 4 4 4 4 5 5 5 5 5 5 5 5 5]
[ 6 6 6 6 6 6 6 6 6 7 7 7 7 7 7]
[ 7 7 7 8 8 8 8 8 8 8 8 8 9 9 9]
[ 9 9 9 9 9 9 10 10 10 10 10 10 10 10 10]
[11 11 11 11 11 11 11 11 11 12 12 12 12 12 12]
[12 12 12 13 13 13 13 13 13 13 13 13 14 14 14]
[14 14 14 14 14 14 15 15 15 15 15 15 15 15 15]
[16 16 16 16 16 16 16 16 16 17 17 17 17 17 17]
[17 17 17 18 18 18 18 18 18 18 18 18 19 19 19]
[19 19 19 19 19 19 20 20 20 20 20 20 20 20 20]
[21 21 21 21 21 21 21 21 21 22 22 22 22 22 22]
[22 22 22 23 23 23 23 23 23 23 23 23 24 24 24]
[24 24 24 24 24 24 25 25 25 25 25 25 25 25 25]]
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