Abstract: An efficient pseudo-color enhancement method for typhoon cloud image was proposed based on Berkeley Wavelet Transform (BWT) and linear assigning pseudo-color enhancement method. Details of the cloud were enhanced in the Berkeley wavelet domain. Then the enhanced cloud image was enhanced in color by classical linear assigning method and improved version respectively. The proposed method was compared with the classical linear assigning method and classical discrete wavelet transform with improved linear assigning method. The experimental results show that the proposed method is simple, of low computation burden and feasible. The proposed method provides a new technique to enhance the contrast of the low contrast typhoon cloud image. Using the proposed method, the eye and screwy cloud bands can be greatly extruded, which will provide a reference to locate the center and predict the intensity of the typhoon.

Key words: typhoon cloud image, pseudo color, enhancement, Berkeley wavelet

摘要： 将Berkeley小波变换(BWT)和线性分配伪彩色增强方法相结合,给出一种有效的台风云图伪彩色增强方法。首先在Berkeley小波域增强云图的细节,然后将增强后的云图分别利用经典的线性分配和改进的线性分配法进行彩色增强。最后将所给出的方法与直接利用经典的线性分配方法、经典离散正交小波预处理后利用改进的线性分配方法进行对比分析。实验结果证明,该方法简便易行,运算量小,在应用中有较大的灵活性,为低对比度台风云图增强处理提供了一种新途径,同时能够有效突出台风眼区和外围螺旋云带等台风结构信息,为后续台风中心定位和台风强度预报提供参考。

关键词: 台风云图, 伪彩色, 增强, Berkeley小波