We introduce a kind of new wavelet-domain HMT segmentation method

a finer to coarser HMTseg

which combine with the classification results of the three subbands for the 2-D wavelet transform.We demonstrate that the new method's performance is somewhat better than the raw segmentation in prevenient document.The advantage to our segmentation algorithms is that they can offer improved segmentation accuracy with smaller computational burden.Finally we introduce a new HMTseg method by updating the classification constrainedly

and then we get a better segmentation result for document image.