Scale the image so that the smallest axis is of size targ.

    Arguments:
        im (array): image
        targ (int): target size

def scale_min(im, targ, interpolation=cv2.INTER_AREA):
    """ Scale the image so that the smallest axis is of size targ.

    Arguments:
        im (array): image
        targ (int): target size
    """
    r,c,*_ = im.shape
    ratio = targ/min(r,c)
    sz = (scale_to(c, ratio, targ), scale_to(r, ratio, targ))
    return cv2.resize(im, sz, interpolation=interpolation)