def pixelNeighborhood(point, image, sigma):
    """
    Takes in a point, an image, and sigma
    Calculates the width from sigma and creates a pixel "neighborhood"
      with the point as the center
    Returns the neighborhood
    """
    width = int(8*sigma)//2
    x,y = point
    neighborhood = image[x-width:x+width+1, y-width:y+width+1]
    return neighborhood