一种基于小波相位信息的低强度X射线影像系统的图像去噪方法

新型低强度X射线影像系统主要是由平板式单近贴静电聚焦X射线像增强器和CCD数据采集系统构成.文章简述了低强度X射线影像系统的图像噪声来源和特点,并根据图像噪声的特点,先进行多帧叠加平均预处理,再进行小波变换滤波.区别于传统的小波变换方法,引入小波变换的相位信息概念,根据噪声和图像信息小波变换后的相位不同特点,从局部和相邻尺度两方面联合进行噪声自动判别和滤除.小波反变换后,得到输出图像,通过对峰值信噪比的计算,表明该方法能取得较好效果.

A Way of The Imaging Filter with Wavelet Phase Based on Low Intense X-ray Image System

New structure low intensity x-ray image system is mainly made of plane plate mode x-ray intensifier of single proximity focus and CCD data acquisition and processing system.The paper explains the noise source and characteristic of the low intensity x-ray image system.Then the compound methods of the "multi-frame mean wavelet transform filter" is submitted which deals with the imaging noise.Firstly,some frame images are superimposed,then mean image is calculated from those images,which is under the principle of noise non-correlation.Secondly,distinguished with the conventional ways of wavelet transformation filtering algorithm,the wave phase information is referred to de-noising.Based on the phase difference between the useful edge and the noise by the wavelet transformation in the image,the noise can be auto-detected and removed,which is achieved by combining the phase of the local and adjacent scale.