ocrolib_ext.py 文件源码

def estimate_skew(flat, bignore=0.1, maxskew=2, skewsteps=8, debug=0):
    ''' estimate skew angle and rotate'''
    d0,d1 = flat.shape
    o0,o1 = int(bignore*d0),int(bignore*d1) # border ignore
    flat = np.amax(flat)-flat
    flat -= np.amin(flat)
    est = flat[o0:d0-o0,o1:d1-o1]
    ma = maxskew
    ms = int(2*maxskew*skewsteps)
    # print(linspace(-ma,ma,ms+1))
    angle = estimate_skew_angle(est,
                                np.linspace(-ma,ma,ms+1),
                                debug=debug)
    flat = interpolation.rotate(flat, angle, mode='constant', reshape=0)
    flat = np.amax(flat)-flat
    return flat, angle