【摘要】 为了实现医学可视化的网络应用 ,提出一种基于小波描述子的表面渲染数据渐进传输方法。首先针对用于表面重建的序列平面轮廓为周期序列的特点 ,提出数字轮廓小波描述子的概念。基于小波描述子进行渐进传输的基本思想是 ,在发送端将轮廓采用小波描述子表示 ,然后对这些小波描述子系数序列渐进发送。在接收端 ,利用陆续收到的描述子系数序列重构轮廓 ,进行表面重建与渲染 ,重建精度和渲染效果随着不断收到‘细节’部分数据而得到改善并最终达到发送端的效果。该方法可以在数据无损传输的情况下 ,降低对传输网络带宽的要求 ,文中实验研究表明了方法的可行性更多还原

【Abstract】 A novel approach of progressive transmission based on wavelet descriptor for surface rendering is proposed. The method presented in this study can be used as a transmission means to apply network for medical data “visualization”. In the first part of the paper, the digital contour wavelet descriptor is defined focusing on features of the series of plane contours used for surface construction where the contours are periodical ones. The basic idea of progressive transmission based on wavelet descriptor is as follows. There are three steps for the progressive transmission procedure. The first one is to represent contours using the wavelet descriptor at the sending site. Then the coefficient series of the wavelet descriptor are transmitted progressively. At the receiving site contours were reconstructed using the descriptor coefficient series, and the surface was reconstructed and rendered. Reconstruction accuracy and rendering effect were refined progressively with data of details, and were improved to image quality at the sending site finally. Transmission can be of full fidelity and bandwidth demand could be moderated. Experiments provided in this paper also show the feasibility of this method.更多还原