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convolve repeated edge
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import math | |
import numpy as np | |
def convolveRepeatedEdge(arr, kernel): | |
arrLen = len(arr) | |
kernelLen = len(kernel) | |
kernelLen_harf = math.floor((kernelLen - 1) / 2) | |
if type(arr) is list: | |
arr2 = [0] * arrLen | |
else: | |
arr2 = np.zeros(arrLen, dtype=arr.dtype) | |
for i in range(arrLen): | |
v = 0; | |
for k in range(kernelLen): | |
ii = i + k - kernelLen_harf | |
if ii < 0: | |
v += kernel[k] * arr[0] | |
elif ii < arrLen: | |
v += kernel[k] * arr[ii] | |
else: | |
v += kernel[k] * arr[arrLen-1] | |
arr2[i] = v; | |
return arr2; |
from scipy import ndimage
import numpy as np
import matplotlib.pyplot as plt
arr1 = [1]*4 + [0]*4;
arr2 = [0]*4 + [1]*4;
kernel = np.array([1, 2, 1]) / 4
arr11 = np.zeros(len(arr1))
arr22 = np.zeros(len(arr2))
ndimage.convolve(arr1, kernel, arr11, mode='nearest')
ndimage.convolve(arr2, kernel, arr22, mode='nearest')
plt.plot(arr11)
plt.plot(arr22)
plt.show()
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