Python feature.corner_harris函数代码示例

def test_binary_descriptors_rotation_crosscheck_true():
    """Verify matched keypoints and their corresponding masks results between
    image and its rotated version with the expected keypoint pairs with
    cross_check enabled."""
    img = data.astronaut()
    img = rgb2gray(img)
    tform = tf.SimilarityTransform(scale=1, rotation=0.15, translation=(0, 0))
    rotated_img = tf.warp(img, tform, clip=False)

    extractor = BRIEF(descriptor_size=512)

    keypoints1 = corner_peaks(corner_harris(img), min_distance=5,
                              threshold_abs=0, threshold_rel=0.1)
    extractor.extract(img, keypoints1)
    descriptors1 = extractor.descriptors

    keypoints2 = corner_peaks(corner_harris(rotated_img), min_distance=5,
                              threshold_abs=0, threshold_rel=0.1)
    extractor.extract(rotated_img, keypoints2)
    descriptors2 = extractor.descriptors

    matches = match_descriptors(descriptors1, descriptors2, cross_check=True)

    exp_matches1 = np.array([ 0,  2,  3,  4,  5,  6,  9, 11, 12, 13, 14, 17,
                             18, 19, 21, 22, 23, 26, 27, 28, 29, 31, 32, 33,
                             34, 35, 36, 37, 38, 39, 40, 41, 42, 43, 44, 46])
    exp_matches2 = np.array([ 0,  2,  3,  1,  4,  6,  5,  7, 13, 10,  9, 11,
                             15,  8, 14, 12, 16, 18, 19, 21, 20, 24, 25, 26,
                             28, 27, 22, 23, 29, 30, 31, 32, 35, 33, 34, 36])
    assert_equal(matches[:, 0], exp_matches1)
    assert_equal(matches[:, 1], exp_matches2)

def test_rotated_img():
    """
    The harris filter should yield the same results with an image and it's
    rotation.
    """
    im = img_as_float(data.astronaut().mean(axis=2))
    im_rotated = im.T

    # Moravec
    results = peak_local_max(corner_moravec(im),
                             min_distance=10, threshold_rel=0)
    results_rotated = peak_local_max(corner_moravec(im_rotated),
                                     min_distance=10, threshold_rel=0)
    assert (np.sort(results[:, 0]) == np.sort(results_rotated[:, 1])).all()
    assert (np.sort(results[:, 1]) == np.sort(results_rotated[:, 0])).all()

    # Harris
    results = peak_local_max(corner_harris(im),
                             min_distance=10, threshold_rel=0)
    results_rotated = peak_local_max(corner_harris(im_rotated),
                                     min_distance=10, threshold_rel=0)
    assert (np.sort(results[:, 0]) == np.sort(results_rotated[:, 1])).all()
    assert (np.sort(results[:, 1]) == np.sort(results_rotated[:, 0])).all()

    # Shi-Tomasi
    results = peak_local_max(corner_shi_tomasi(im),
                             min_distance=10, threshold_rel=0)
    results_rotated = peak_local_max(corner_shi_tomasi(im_rotated),
                                     min_distance=10, threshold_rel=0)
    assert (np.sort(results[:, 0]) == np.sort(results_rotated[:, 1])).all()
    assert (np.sort(results[:, 1]) == np.sort(results_rotated[:, 0])).all()

def test_square_image():
    im = np.zeros((50, 50)).astype(float)
    im[:25, :25] = 1.

    # Moravec
    results = peak_local_max(corner_moravec(im),
                             min_distance=10, threshold_rel=0)
    # interest points along edge
    assert len(results) == 57

    # Harris
    results = peak_local_max(corner_harris(im, method='k'),
                             min_distance=10, threshold_rel=0)
    # interest at corner
    assert len(results) == 1

    results = peak_local_max(corner_harris(im, method='eps'),
                             min_distance=10, threshold_rel=0)
    # interest at corner
    assert len(results) == 1

    # Shi-Tomasi
    results = peak_local_max(corner_shi_tomasi(im),
                             min_distance=10, threshold_rel=0)
    # interest at corner
    assert len(results) == 1

def test_rotated_lena():
    """
    The harris filter should yield the same results with an image and it's
    rotation.
    """
    im = img_as_float(data.lena().mean(axis=2))
    im_rotated = im.T

    # Moravec
    results = peak_local_max(corner_moravec(im))
    results_rotated = peak_local_max(corner_moravec(im_rotated))
    assert (np.sort(results[:, 0]) == np.sort(results_rotated[:, 1])).all()
    assert (np.sort(results[:, 1]) == np.sort(results_rotated[:, 0])).all()

    # Harris
    results = peak_local_max(corner_harris(im))
    results_rotated = peak_local_max(corner_harris(im_rotated))
    assert (np.sort(results[:, 0]) == np.sort(results_rotated[:, 1])).all()
    assert (np.sort(results[:, 1]) == np.sort(results_rotated[:, 0])).all()

    # Shi-Tomasi
    results = peak_local_max(corner_shi_tomasi(im))
    results_rotated = peak_local_max(corner_shi_tomasi(im_rotated))
    assert (np.sort(results[:, 0]) == np.sort(results_rotated[:, 1])).all()
    assert (np.sort(results[:, 1]) == np.sort(results_rotated[:, 0])).all()

    def process(self, img2, image_gray):
        # img2 = warp(img2)
        patch_size = [640]
        img2 = rgb2gray(img2)
        image_gray = rgb2gray(img2)

        blobs_dog = blob_dog(image_gray, min_sigma=0.2, max_sigma=225, sigma_ratio=1.6, threshold=.5)
        blobs_dog[:, 2] = blobs_dog[:, 2]

        blobs = [blobs_dog]
        colors = ['black']
        titles = ['Difference of Gaussian']
        sequence = zip(blobs, colors, titles)

        # plt.imshow(img2)
        # plt.axis("equal")
        # plt.show()

        for blobs, color, title in sequence:
            print(len(blobs))
            for blob in blobs:
                y, x, r = blob
                plotx = x
                ploty = y
                for i in range (3):
                    keypoints1 = corner_peaks(corner_harris(Array.image_arr[i]), min_distance=1)
                    keypoints2 = corner_peaks(corner_harris(img2), min_distance=1)

                    extractor = BRIEF(patch_size=30, mode="uniform")

                    extractor.extract(Array.image_arr[i], keypoints1)
                    keypoints1 = keypoints1[extractor.mask]
                    descriptors1 = extractor.descriptors

                    extractor.extract(img2, keypoints2)
                    keypoints2 = keypoints2[extractor.mask]
                    descriptors2 = extractor.descriptors

                    matches12 = match_descriptors(descriptors1, descriptors2, cross_check=True)
                    
                    # print(keypoints1, keypoints2)
                    # print(matches12)
                    #FUCKGGGPLAYT
                    for pizdezh in matches12:
                        X = keypoints2[pizdezh[1]][1]
                        Y = keypoints2[pizdezh[1]][0]

                    if sqrt((plotx - X)**2 + (ploty - Y)**2) < r:
                        seen = [{
                            "type": Array.type_arr[i],
                            "center_shift": (plotx - 160/2) * -0.02,
                            "distance": image_gray[y][x] / 0.08
                        }]
                        print seen
                        data.seen.add(seen)
                        break

def test_uniform_mode():
    """Verify the computed BRIEF descriptors with expected for uniform mode."""
    img = data.coins()

    keypoints = corner_peaks(corner_harris(img), min_distance=5, threshold_abs=0, threshold_rel=0.1)

    extractor = BRIEF(descriptor_size=8, sigma=2, mode="uniform")

    extractor.extract(img, keypoints[:8])

    expected = np.array(
        [
            [False, False, False, True, True, True, False, False],
            [True, True, True, False, True, False, False, True],
            [True, True, True, False, True, True, False, True],
            [True, True, True, True, False, True, False, True],
            [True, True, True, True, True, True, False, False],
            [True, True, True, True, True, True, True, True],
            [False, False, False, True, True, True, True, True],
            [False, True, False, True, False, True, True, True],
        ],
        dtype=bool,
    )

    assert_array_equal(extractor.descriptors, expected)

def featurize(img_name):
    """Load an image and convert it into a dictionary of features"""
    img = plt.imread(os.path.join('stimuli', img_name + '.png'))
    height, width, _ = img.shape
    features = defaultdict(int)
    for y in range(height):
        for x in range(width):
            features['red'] += img[y][x][0]
            features['green'] += img[y][x][1]
            features['blue'] += img[y][x][2]
            features['alpha'] += img[y][x][3]

    grey = color.rgb2grey(img)
    for y in range(height):
        for x in range(width):
            for key, value in per_pixel(grey, y, x):
                features[key] += value

    # Normalize over image size
    for key, value in features.items():
        features[key] = float(value) / height / width

    features['blob'] = feature.blob_dog(grey).shape[0]
    features['corners'] = feature.corner_peaks(
        feature.corner_harris(grey)).shape[0]
    return features

def guess_corners(bw):
    """
    Infer the corners of an image using a Sobel filter to find the edges and a
    Harris filter to find the corners.  Takes a single color chanel.

    Parameters
    ----------
    bw : (m x n) ndarray of ints

    Returns
    -------
    corners : pixel coordinates of plot corners, unsorted
    outline : (m x n) ndarray of bools True -> plot area
    """
    assert len(bw.shape) == 2
    bw = img_as_uint(bw)
    e_map = ndimage.sobel(bw)

    markers = np.zeros(bw.shape, dtype=int)
    markers[bw < 30] = 1
    markers[bw > 150] = 2
    seg = ndimage.watershed_ift(e_map, np.asarray(markers, dtype=int))

    outline = ndimage.binary_fill_holes(1 - seg)
    corners = corner_harris(np.asarray(outline, dtype=int))
    corners = approximate_polygon(corners, 1)
    return corners, outline

def test_subpix_dot():
    img = np.zeros((50, 50))
    img[25, 25] = 255
    corner = peak_local_max(corner_harris(img),
                            min_distance=10, threshold_rel=0, num_peaks=1)
    subpix = corner_subpix(img, corner)
    assert_array_equal(subpix[0], (25, 25))

def test_subpix():
    img = np.zeros((50, 50))
    img[:25,:25] = 255
    img[25:,25:] = 255
    corner = peak_local_max(corner_harris(img), num_peaks=1)
    subpix = corner_subpix(img, corner)
    assert_array_equal(subpix[0], (24.5, 24.5))

def get_harris_corners(im, edge_discard=20):
    """
    This function takes a b&w image and an optional amount to discard
    on the edge (default is 5 pixels), and finds all harris corners
    in the image. Harris corners near the edge are discarded and the
    coordinates of the remaining corners are returned. A 2d array (h)
    containing the h value of every pixel is also returned.

    h is the same shape as the original image, im.
    coords is 2 x n (ys, xs).
    """

    assert edge_discard >= 20

    # find harris corners
    h = corner_harris(im, method='eps', sigma=1)
    coords = peak_local_max(h, min_distance=1, indices=True)

    # discard points on edge
    edge = edge_discard  # pixels
    mask = (coords[:, 0] > edge) & \
           (coords[:, 0] < im.shape[0] - edge) & \
           (coords[:, 1] > edge) & \
           (coords[:, 1] < im.shape[1] - edge)
    coords = coords[mask].T
    return h, coords

def extract_corner_harris(patch):
    """ Extract four corner points using harris corner detection algorithm

    """
    # Find corner with harris corner detection
    coords = corner_peaks(corner_harris(patch, k=0.1), min_distance=5)
    coords_subpix = corner_subpix(patch, coords, window_size=13)

    # Find the nearest point for each corner
    dim = patch.shape
    corners = [(0, 0), (dim[0], 0), (dim[0], dim[1]), (0, dim[1])]

    dest_points = [[] for x in range(4)]
    for i in xrange(4):
        dest_points[i] = search_closest_points(corners[i], coords_subpix)

    # Check for error
    try:
        epsilon = 1e-10
        for i in xrange(4):
            for j in xrange(i + 1, 4):
                if calc_distance(dest_points[i], dest_points[j]) < epsilon:
                    print 'Error point'
                    return []
    except TypeError:
        return []

    # Reverse y,x position to x,y
    for i in xrange(4):
        dest_points[i][1], dest_points[i][0] = dest_points[i][0], dest_points[i][1]

    return dest_points

def dumb_matcher(img1, img2):
    kps = lambda img: feature.corner_peaks(feature.corner_harris(img), min_distance = 2)
    kp1 = kps(img1)
    kp2 = kps(img2)
    to_set = lambda aoa: set(map(lambda x: (x[0], x[1]), aoa))
    s1 = to_set(kp1)
    s2 = to_set(kp2)
    return float(len(s1 & s2) * 2) / (len(s1) + len(s2))

def find_corners(path, min_distance=5):
    """Find corners in an image at path
    
    Returns the image and the corner lists.
    """
    from skimage.feature import corner_harris, corner_peaks
    img = imread(path, flatten=True)
    corners = corner_peaks(corner_harris(img), min_distance=min_distance)
    return img, corners

def test_subpix_no_class():
    img = np.zeros((50, 50))
    subpix = corner_subpix(img, np.array([[25, 25]]))
    assert_array_equal(subpix[0], (np.nan, np.nan))

    img[25, 25] = 1e-10
    corner = peak_local_max(corner_harris(img), num_peaks=1)
    subpix = corner_subpix(img, np.array([[25, 25]]))
    assert_array_equal(subpix[0], (np.nan, np.nan))