<PY><NumPy><SciPy>图像翻转切割遮罩

from scipy import misc
import matplotlib.pyplot as plt
lena=misc.lena();print lena.shape
lena2=lena.repeat(3,axis=0).repeat(2,axis=1);print lena2.shape #resize

plt.figure(0)
plt.subplot(211)
plt.imshow(lena)
plt.subplot(212)
plt.imshow(lena2)

plt.figure(1)
acopy=lena.copy();print acopy.shape  #copy
aview=acopy.view()
aview.flat=0
plt.imshow(aview)

plt.figure(2)
plt.imshow(lena[:,::-1])  #overturn
plt.figure(3)
plt.imshow(lena[:,:256])  #cut
plt.figure(4)
plt.imshow(lena[:lena.shape[0]/2,:lena.shape[1]/2])  #cut 2

plt.figure(5)
mask=lena%2==0  #bool mask
masked=lena.copy()
masked[mask]=0
plt.imshow(masked) #mask

plt.show()