docompare.py 文件源码

def GetLineSegments(itrim):
    """
    Segment an image in lines and interline spaces
    Returns lists of both (position width)
    """
        # sum along pixel lines
    asum = np.sum(itrim, axis=1)
    abin = asum > 0
    sp = []
    tx = []
    lastval=-1
    lastpos=-1
    for i in range(0, abin.size):
        if abin[i] != lastval:
            lastval = abin[i]
            if lastval:
                tx.append(np.array((i,0)))
                if i>0: 
                    sp[-1][1] = i-sp[-1][0]
            else:
                sp.append(np.array((i,0)))
                if i>0: 
                    tx[-1][1] = i-tx[-1][0]
    # set the last segment lenght
    if tx[-1][1] == 0: tx[-1][1] = itrim.shape[0] - tx[-1][0]
    if sp==[]:# empy if there is just one line in the image
        sp.append(np.array((0,0)))
    else:
        if sp[-1][1] == 0: sp[-1][1] = itrim.shape[0] - sp[-1][0]
    return tx, sp