def edge_pixels_from_mask(mask):
    """Compute a 1D array listing all edge pixel indexes in the masks. An edge pixel is a pixel which is not fully \
    surrounding by False masks values i.e. it is on an edge."""

    edge_pixel_total = total_edge_pixels_from_mask(mask)

    edge_pixels = np.zeros(edge_pixel_total)
    edge_index = 0
    regular_index = 0

    for y in range(mask.shape[0]):
        for x in range(mask.shape[1]):
            if not mask[y, x]:
                if mask[y + 1, x] or mask[y - 1, x] or mask[y, x + 1] or mask[y, x - 1] or \
                        mask[y + 1, x + 1] or mask[y + 1, x - 1] or mask[y - 1, x + 1] or mask[y - 1, x - 1]:
                    edge_pixels[edge_index] = regular_index
                    edge_index += 1

                regular_index += 1

    return edge_pixels
def edge_pixels_from_mask(mask):
    """Compute a 1D array listing all edge pixel indexes in the masks. An edge pixel is a pixel which is not fully \
    surrounding by False masks values i.e. it is on an edge."""

    edge_pixel_total = total_edge_pixels_from_mask(mask)

    edge_pixels = np.zeros(edge_pixel_total)
    edge_index = 0
    regular_index = 0

    for y in range(mask.shape[0]):
        for x in range(mask.shape[1]):
            if not mask[y, x]:
                if mask[y + 1, x] or mask[y - 1, x] or mask[y, x + 1] or mask[y, x - 1] or \
                        mask[y + 1, x + 1] or mask[y + 1, x - 1] or mask[y - 1, x + 1] or mask[y - 1, x - 1]:
                    edge_pixels[edge_index] = regular_index
                    edge_index += 1

                regular_index += 1

    return edge_pixels
def edge_pixels_from_mask ( mask ) : edge_pixel_total = total_edge_pixels_from_mask ( mask ) edge_pixels = np . zeros ( edge_pixel_total ) edge_index = 0 regular_index = 0 for y in range ( mask . shape [ 0 ] ) : for x in range ( mask . shape [ 1 ] ) : if not mask [ y , x ] : if mask [ y + 1 , x ] or mask [ y - 1 , x ] or mask [ y , x + 1 ] or mask [ y , x - 1 ] or mask [ y + 1 , x + 1 ] or mask [ y + 1 , x - 1 ] or mask [ y - 1 , x + 1 ] or mask [ y - 1 , x - 1 ] : edge_pixels [ edge_index ] = regular_index edge_index += 1 regular_index += 1 return edge_pixels
Compute a 1D array listing all edge pixel indexes in the masks. An edge pixel is a pixel which is not fully \
    surrounding by False masks values i.e. it is on an edge.
Compute a 1D array listing all edge pixel indexes in the masks . An edge pixel is a pixel which is not fully \ surrounding by False masks values i . e . it is on an edge .