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License: MIT License
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License: MIT License
Hi,我在网上搜索 Arnold 变换,搜到了这里,但关于 Arnold 变换的实现代码似乎有点问题?
https://github.com/GooZy/EasyW/blob/master/easyw/common/utils.py#L35
for i in range(N):
for x in range(h):
for y in range(w):
- nx = ((a * x + b * y) % w + w) % w
- ny = ((c * x + d * y) % w + w) % w
+ nx = ((a * x + b * y) % w)
+ ny = ((c * x + d * y) % w)
nx = int(nx)
ny = int(ny)
new_img[nx, ny] = img[x, y]
img = copy.deepcopy(new_img)
对 w
取模后又加上 w
,然后又对 w
取模,好像结果是一样的。即
x % w == ((x % w) + w) % w
Arnold 变换公式也没有后面的两部
操作,所以就开了个 issue😂。
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