Python _nearest_voxel_sampling Examples

Example #1

File: test_surface.py Project: rob-luke/nilearn

def test_sampling_affine():
    # check sampled (projected) values on a toy image
    img = np.ones((4, 4, 4))
    img[1, :, :] = 2
    nodes = [[1, 1, 2], [10, 10, 20], [30, 30, 30]]
    mesh = [np.asarray(nodes), None]
    affine = 10 * np.eye(4)
    affine[-1, -1] = 1
    texture = surface._nearest_voxel_sampling(
        [img], mesh, affine=affine, radius=1, kind='ball')
    assert_array_equal(texture[0], [1., 2., 1.])
    texture = surface._interpolation_sampling(
        [img], mesh, affine=affine, radius=0, kind='ball')
    assert_array_almost_equal(texture[0], [1.1, 2., 1.])

Example #2

File: test_surface.py Project: mrahim/nilearn

def test_sampling_affine():
    # check sampled (projected) values on a toy image
    img = np.ones((4, 4, 4))
    img[1, :, :] = 2
    nodes = [[1, 1, 2], [10, 10, 20], [30, 30, 30]]
    mesh = [np.asarray(nodes), None]
    affine = 10 * np.eye(4)
    affine[-1, -1] = 1
    texture = surface._nearest_voxel_sampling(
        [img], mesh, affine=affine, radius=1, kind='ball')
    assert_array_equal(texture[0], [1., 2., 1.])
    texture = surface._interpolation_sampling(
        [img], mesh, affine=affine, radius=0, kind='ball')
    assert_array_almost_equal(texture[0], [1.1, 2., 1.])