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我試圖實現3D DFT,但我遇到了一些麻煩。我相信我應該做的只是連續3次一維DFT,每個方向一個。假設一維DFT是正確的,你可以看到什麼是錯,此代碼:實現3D DFT時無法匹配結果
def dft3d(self, real3d, img3d, nx, ny, nz, dir):
#Transform depth
for i in range(nx):
for j in range(ny):
real = numpy.zeros(nz)
img = numpy.zeros(nz)
for k in range(nz):
real[k] = real3d[i][j][k]
img[k] = img3d[i][j][k]
self.dft(real, img, nz, 1) #This was indented too much. It should work now.
for k in range(nz):
real3d[i][j][k] = real[k]
img3d[i][j][k] = img[k]
#Transform cols
for k in range(nz):
for i in range(nx):
real = numpy.zeros(ny)
img = numpy.zeros(ny)
for j in range(ny):
real[j] = real3d[i][j][k]
img[j] = img3d[i][j][k]
self.dft(real, img, ny, 1)
for j in range(ny):
real3d[i][j][k] = real[j]
img3d[i][j][k] = img[j]
#Transform rows
for j in range(ny):
for k in range(nz):
real = numpy.zeros(nx)
img = numpy.zeros(nx)
for i in range(nx):
real[i] = real3d[i][j][k]
img[i] = img3d[i][j][k]
self.dft(real, img, nx, 1)
for i in range(nx):
real3d[i][j][k] = real[i]
img3d[i][j][k] = img[i]
我知道有建在蟒蛇的這個版本,但我不能使用這些。我只是在Python中測試我的算法,所以我可以比較我的算法和內置算法的結果。據我所知,對於1D和2D變換都行得通,但是一旦我將其擴展到3D,結果就不再匹配。有誰知道什麼是錯的?
哦,我的。它必須是愚蠢的。非常感謝。你是當天的英雄。 另外,感謝關於numpy的提示。 – Feryla 2012-02-03 04:20:14
您也可以滾動numpy座標軸,以便不需要編寫三個單獨的循環。 – DSM 2012-02-03 04:26:32