【摘要】 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 ,再进行数学形态学滤波。区别于传统的形态滤波方法 ,在多尺寸形态滤波的基础上 ,引入差分图像的概念 ,先得到一组包含不同尺寸的噪声和图像信息的差分图像 ,将各个差分图像应用小波变换去噪后 ,与最后一级形态滤波平滑的图像相加 ,就得到了既去除噪声又保留图像细节的目标图像 ,通过对峰值信噪比的计算 ,表明该方法能取得较好效果。更多还原

【Abstract】 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. In the paper,We explains the noise source and characteristic of the low intensity x-ray image system. Then the compound methods of the “multi-frame mean + morphological transform filter” is submitted which deals with the imaging noise. Firstly, some frame images is superimposed, then mean image is calculated from those images, which is under the principle of noise non-correlation. Secondly, distinguishing with the conventional ways of morphological transformation filtering algorithm, the differential image information is referred to de-noising. The differential image which is obtained from the source image includes noise and some image details. After the noise of the differential image is cut off by the wavelet translation, the differential image is added to the last filtered image by the multi-scale morphological filter, then the clean image is achieved which has no noise but keeps the image details.更多还原