Python transform.estimate_transform函数代码示例

def test_estimate_transform():
    for tform in ('euclidean', 'similarity', 'affine', 'projective',
                  'polynomial'):
        estimate_transform(tform, SRC[:2, :], DST[:2, :])
    with pytest.raises(ValueError):
        estimate_transform('foobar',
                  SRC[:2, :], DST[:2, :])

def test_deprecated_params_attributes():
    for t in ('projective', 'affine', 'similarity'):
        tform = estimate_transform(t, SRC, DST)
        assert_equal(tform._matrix, tform.params)

    tform = estimate_transform('polynomial', SRC, DST, order=3)
    assert_equal(tform._params, tform.params)

def test_deprecated_params_attributes():
    for t in ('projective', 'affine', 'similarity'):
        tform = estimate_transform(t, SRC, DST)
        with expected_warnings(['`_matrix`.*deprecated']):
            assert_equal(tform._matrix, tform.params)

    tform = estimate_transform('polynomial', SRC, DST, order=3)
    with expected_warnings(['`_params`.*deprecated']):
        assert_equal(tform._params, tform.params)

def test_projective_estimation():
    # exact solution
    tform = estimate_transform('projective', SRC[:4, :], DST[:4, :])
    assert_almost_equal(tform(SRC[:4, :]), DST[:4, :])

    # over-determined
    tform2 = estimate_transform('projective', SRC, DST)
    assert_almost_equal(tform2.inverse(tform2(SRC)), SRC)

    # via estimate method
    tform3 = ProjectiveTransform()
    tform3.estimate(SRC, DST)
    assert_almost_equal(tform3.params, tform2.params)

def test_affine_estimation():
    # exact solution
    tform = estimate_transform('affine', SRC[:3, :], DST[:3, :])
    assert_array_almost_equal(tform(SRC[:3, :]), DST[:3, :])

    # over-determined
    tform2 = estimate_transform('affine', SRC, DST)
    assert_array_almost_equal(tform2.inverse(tform2(SRC)), SRC)

    # via estimate method
    tform3 = AffineTransform()
    tform3.estimate(SRC, DST)
    assert_array_almost_equal(tform3._matrix, tform2._matrix)

def main(base_dir):
    BASE_DIR = base_dir

    # Load the set of pictures
    ic = io.ImageCollection(BASE_DIR + '*.JPG')

    # Select points on the first picture
    f, ax = plt.subplots(1,1)
    ax.get_xaxis().set_visible(False)
    ax.get_yaxis().set_visible(False)
    ax.autoscale(enable=True, axis='both', tight=True);
    plt.tight_layout(pad=0.4, w_pad=0.0, h_pad=0.0)
    ax.imshow(ic[0])

    coords = [plt.ginput(8, timeout=0)]

    plt.close()

    # Load first picture side-by side with second, select points.
    # Scroll through images one-by-one
    for i, img in enumerate(ic[1:]):
        ax1 = plt.subplot2grid((6,10),(0,1), rowspan=6, colspan=9)
        ax0 = plt.subplot2grid((6,10),(0,0))
        
        for ax in [ax0, ax1]:
            ax.get_xaxis().set_visible(False)
            ax.get_yaxis().set_visible(False)
        
        plt.tight_layout(pad=0.4, w_pad=0.0, h_pad=0.0)
        
        #f, (ax0,ax1) = plt.subplots(1,2)
        ax0.imshow(ic[i])
        for coord in coords[i]:
            ax0.scatter(coord[0],coord[1])
        ax1.imshow(img)
        
        coords.append(plt.ginput(8, timeout=0))
        
        plt.close()

    # Use a similarity transformation to transform each one.

    if not os.path.exists(BASE_DIR + 'corrected'):
        os.mkdir(BASE_DIR + 'corrected')

    np.save(BASE_DIR + 'corrected/coords.npy', coords)

    io.imsave(BASE_DIR + 'corrected/0.jpg', ic[0])
    for i, img in enumerate(ic[1:]):
        tf = transform.estimate_transform('similarity', np.array(coords[0]), np.array(coords[i+1]))

    # Use a translation transformation to center both images for display purposes

        img_warped = transform.warp(img, inverse_map=tf,
                                     output_shape=(1728,3072))
        
        print BASE_DIR + 'corrected/%d.jpg' %(i+1)
        print img_warped
        
        io.imsave(BASE_DIR + 'corrected/%d.jpg' %(i+1), img_warped)

def estimate_coordinate_transform(source, target, method, **method_kwargs):
    """Calculates a transformation from a source list of coordinates to a
    target list of coordinates.

    Parameters
    ----------
    source : Nx2 array
        (x, y) coordinate pairs from source image.
    target : Nx2 array
        (x, y) coordinate pairs from target image. Must be same shape as
        'source'.
    method : string, optional
        Method to use for transform estimation.
    **method_kwargs : optional
        Additional arguments can be passed in specific to the particular
        method. For example, 'order' for a polynomial transform estimation.

    Returns
    -------
    transform : skimage.transform._geometric.GeometricTransform
        An skimage transform object.

    See Also
    --------
    skimage.transform.estimate_transform

    """

    return tf.estimate_transform(method, source, target, **method_kwargs)

def gen_data(name):
    reftracker = scio.loadmat('data/images_tracker.00047.mat')['tracker']
    desttracker = scio.loadmat('data/images_tracker/'+name+'.mat')['tracker']
    refpos = np.floor(np.mean(reftracker, 0))
    xxc, yyc = np.meshgrid(np.arange(1, 1801, dtype=np.int), np.arange(1, 2001, dtype=np.int))
    #normalize x and y channels
    xxc = (xxc - 600 - refpos[0]) * 1.0 / 600
    yyc = (yyc - 600 - refpos[1]) * 1.0 / 600
    maskimg = Image.open('data/meanmask.png')
    maskc = np.array(maskimg, dtype=np.float)
    maskc = np.pad(maskc, (600, 600), 'minimum')
    # warp is an inverse transform, and so src and dst must be reversed here
    tform = transform.estimate_transform('affine', desttracker + 600, reftracker + 600)
    
    img_data = skio.imread('data/images_data/'+name+'.jpg')
    # save org mat
    warpedxx = transform.warp(xxc, tform, output_shape=xxc.shape)
    warpedyy = transform.warp(yyc, tform, output_shape=xxc.shape)
    warpedmask = transform.warp(maskc, tform, output_shape=xxc.shape)
    warpedxx = warpedxx[600:1400, 600:1200, :]
    warpedyy = warpedyy[600:1400, 600:1200, :]
    warpedmask = warpedmask[600:1400, 600:1200, :]
    img_h, img_w, _ = img_data.shape
    mat = np.zeros((img_h, img_w, 6), dtype=np.float)
    mat[:, :, 0] = (img_data[2] * 1.0 - 104.008) / 255
    mat[:, :, 1] = (img_data[1] * 1.0 - 116.669) / 255
    mat[:, :, 2] = (img_data[0] * 1.0 - 122.675) / 255
    scio.savemat('portraitFCN_data/' + name + '.mat', {'img':mat})
    mat_plus = np.zeros((img_h, img_w, 6), dtype=np.float)
    mat_plus[:, :, 0:3] = mat
    mat_plus[:, :, 3] = warpedxx
    mat_plus[:, :, 4] = warpedyy
    mat_plus[:, :, 5] = warpedmask

def extract_sift(image,lm=None, shape=[200,300], fix_points='outer',ttype='affine'):
    if lm==None:lm = landmarks(image)
    if np.any(np.isnan(lm)):
        return np.nan*np.ones([out_shape,out_shape,image.shape[2]]).astype(np.float16), np.nan*np.zeros_like(lm)
    dst = mean_face[:,p[fix_points]]
    dst = dst-dst.mean(1)[:,None]
    dst = dst/np.abs(dst).max()
    dst *=shape[0]/2
    dst +=shape[1]/2
    print(dst.min())
    print(dst.max())
    src = lm[:,p[fix_points]]
    tform = transform.estimate_transform(ttype, src.T,dst.T)
    lm_reg = tform(lm.T).T
    image = transform.warp(image,inverse_map=tform.inverse,output_shape=[shape[1],shape[1]])
    image = exposure.equalize_hist(image,mask=image!=0)
    S = 12
    for l1,l2 in lm_reg.T:
        x = np.arange(l2-S,l2+S)
        y = np.arange(l1-S,l1+S)
        for x_ in x:
            for y_ in y:
                image[x_,y_,0]=255


    return image, lm_reg

def infer(edge_image, edge_lengths, mu, phi, sigma2,
          update_slice=slice(None),
          scale_estimate=None,
          rotation=0,
          translation=(0, 0)):
    # edge_points = np.array(np.where(edge_image)).T
    # edge_points[:, [0, 1]] = edge_points[:, [1, 0]]
    # edge_score = edge_image.shape[0] * np.exp(-edge_lengths[edge_image] / (0.25 * edge_image.shape[0])).reshape(-1, 1)
    # edge_points = np.concatenate((edge_points, edge_score), axis=1)
    #
    # edge_nn = NearestNeighbors(n_neighbors=1).fit(edge_points)

    edge_near = scipy.ndimage.distance_transform_edt(~edge_image)
    edge_near_blur = gaussian(edge_near, 2)
    Gy, Gx = np.gradient(edge_near_blur)
    mag = np.sqrt(np.power(Gy, 2) + np.power(Gx, 2))

    if scale_estimate is None:
        scale_estimate = min(edge_image.shape) * 4

    mu = (mu.reshape(-1, 2) - mu.reshape(-1, 2).mean(axis=0)).reshape(-1, 1)
    average_distance = np.sqrt(np.power(mu.reshape(-1, 2), 2).sum(axis=1)).mean()
    scale_estimate /= average_distance * np.sqrt(2)

    h = np.zeros((phi.shape[1], 1))

    psi = SimilarityTransform(scale=scale_estimate, rotation=rotation, translation=translation)

    while True:
        w = (mu + phi @ h).reshape(-1, 2)
        image_points = matrix_transform(w, psi.params)[update_slice, :]
        image_points = np.concatenate((image_points, np.zeros((image_points.shape[0], 1))), axis=1)

        # closest_edge_point_indices = edge_nn.kneighbors(image_points)[1].flatten()
        # closest_edge_points = edge_points[closest_edge_point_indices, :2]

        closest_edge_points = gradient_step(Gy, Gx, mag, image_points)

        w = mu.reshape(-1, 2)
        psi = estimate_transform('similarity', w[update_slice, :], closest_edge_points)

        image_points = matrix_transform(w, psi.params)[update_slice, :]
        image_points = np.concatenate((image_points, np.zeros((image_points.shape[0], 1))), axis=1)

        # closest_edge_point_indices = edge_nn.kneighbors(image_points)[1].flatten()
        # closest_edge_points = edge_points[closest_edge_point_indices, :2]

        closest_edge_points = gradient_step(Gy, Gx, mag, image_points)

        mu_slice = mu.reshape(-1, 2)[update_slice, :].reshape(-1, 1)
        K = phi.shape[-1]
        phi_full = phi.reshape(-1, 2, K)
        phi_slice = phi_full[update_slice, :].reshape(-1, K)
        h = update_h(sigma2, phi_slice, closest_edge_points, mu_slice, psi)

        w = (mu + phi @ h).reshape(-1, 2)
        image_points = matrix_transform(w, psi.params)

        update_slice = yield image_points, closest_edge_points

def projective(reference, points, bone, properties_to_transform):
    """
    Estimates a projective transform
    """
    tform = tf.estimate_transform('projective', points, reference)
    transformed = list(map(tform, [ bone[p] for p in properties_to_transform  ]))
    error = get_error(points, reference, tform)
    return transformed, error

def test_similarity_estimation():
    # exact solution
    tform = estimate_transform('similarity', SRC[:2, :], DST[:2, :])
    assert_array_almost_equal(tform(SRC[:2, :]), DST[:2, :])
    assert_equal(tform._matrix[0, 0], tform._matrix[1, 1])
    assert_equal(tform._matrix[0, 1], - tform._matrix[1, 0])

    # over-determined
    tform2 = estimate_transform('similarity', SRC, DST)
    assert_array_almost_equal(tform2.inverse(tform2(SRC)), SRC)
    assert_equal(tform2._matrix[0, 0], tform2._matrix[1, 1])
    assert_equal(tform2._matrix[0, 1], - tform2._matrix[1, 0])

    # via estimate method
    tform3 = SimilarityTransform()
    tform3.estimate(SRC, DST)
    assert_array_almost_equal(tform3._matrix, tform2._matrix)

def test_euclidean_estimation():
    # exact solution
    tform = estimate_transform('euclidean', SRC[:2, :], SRC[:2, :] + 10)
    assert_almost_equal(tform(SRC[:2, :]), SRC[:2, :] + 10)
    assert_almost_equal(tform.params[0, 0], tform.params[1, 1])
    assert_almost_equal(tform.params[0, 1], - tform.params[1, 0])

    # over-determined
    tform2 = estimate_transform('euclidean', SRC, DST)
    assert_almost_equal(tform2.inverse(tform2(SRC)), SRC)
    assert_almost_equal(tform2.params[0, 0], tform2.params[1, 1])
    assert_almost_equal(tform2.params[0, 1], - tform2.params[1, 0])

    # via estimate method
    tform3 = EuclideanTransform()
    tform3.estimate(SRC, DST)
    assert_almost_equal(tform3.params, tform2.params)

def similarity(reference, points, bone, properties_to_transform):
    """
    Estimates a similarity transform
    """
    tform = tf.estimate_transform('similarity', points, reference)
    transformed = list(map(tform, [ bone[p] for p in properties_to_transform  ]))
    error = get_error(points, reference, tform)
    return transformed, error

def test_polynomial_estimation():
    # over-determined
    tform = estimate_transform('polynomial', SRC, DST, order=10)
    assert_array_almost_equal(tform(SRC), DST, 6)

    # via estimate method
    tform2 = PolynomialTransform()
    tform2.estimate(SRC, DST, order=10)
    assert_array_almost_equal(tform2._params, tform._params)