数字空间轮廓的小波描述子

WAVELET DESCRIPTOR OF CONTOURS IN DIGITAL SPACE

为了描述数字空间目标轮廓,便于计算机图形表达,提出一种适于描述序列点轮廓的小波描述子。将数字空间轮廓视为周期序列,并基于离散小波变换给出序列点轮廓小波描述子的具体表达。结合具体医学图像轮廓进行相应的应用研究,并与Fourier轮廓描述子进行了对比,研究结果表明,在具有相同比特率的情况下,序列点轮廓小波描述子具有更好的保形性,同时实现了对轮廓数据的压缩。

To describe contours in digital space and simplify the presentation of computer graphics, a wavelet descriptor is presented, which is suitable for contours constructed with a set of points. According to the fact that contours in digital space is periodical, wavelet descriptor is defined based on wavelet analysis of discrete periodic signal. Application of the wavelet descriptor for medical image contour description is achieved. Comparing with Fourier descriptor, this work shows that the contours expressed by wavelet descriptor can make a good shape preserving, and the data for constructing the contours is compressed.