def show_global_hierarchical_block_permutation_3x3(imgfile='../demo/owl.jpg'):
im = vipy.image.Image(imgfile).resize(486, 486, interp='nearest')
img_permuted = hierarchical_block_permute(im.array(),
blockshape=(3, 3),
permute_at_level=[0, 1, 2, 3])
im.close().show()
vipy.image.Image(array=img_permuted).show()
def show_local_hierarchical_block_permutation(imgfile='../demo/owl.jpg'):
im = vipy.image.Image(imgfile).resize(512, 512, interp='nearest')
img_permuted = hierarchical_block_permute(im.array(),
blockshape=(2, 2),
permute_at_level=[4, 5])
im.close().show()
vipy.image.Image(array=img_permuted).show()
def show_global_hierarchical_block_permutation_grey_2x3(
imgfile='../demo/owl.jpg'):
im = vipy.image.Image(imgfile).resize(rows=512, cols=486,
interp='nearest').greyscale()
img_permuted = hierarchical_block_permute(im.array(),
blockshape=(2, 3),
permute_at_level=[0, 1, 2, 3])
im.close().show()
vipy.image.Image(array=img_permuted, colorspace='float').show()
def test_hierarchical_block_permutation(imgfile='../demo/owl.jpg',
show=False,
seed=42):
im = vipy.image.Image(imgfile).resize(256, 256, interp='nearest')
img_permuted = hierarchical_block_permute(im.array(),
blockshape=(2, 2),
permute_at_level=[0, 1],
seed=seed)
P = hierarchical_block_permutation_matrix(im.array().shape,
blockshape=(2, 2),
permute_at_level=[0, 1],
seed=seed)
img_permuted_matrix = np.array(
P.dot(im.array().flatten()).reshape(img_permuted.shape))
if show:
vipy.image.Image(array=img_permuted).show()
vipy.image.Image(array=img_permuted_matrix, colorspace='float').show()
assert np.allclose(img_permuted_matrix.flatten(),
img_permuted.flatten(),
atol=1E-5)
print('[test_blockpermute]: hierarchical_block_permutation PASSED')