基于小波变换的数字胸片自适应增强  

Digital Radiography Image Adaptive Enhancement Based on Wavelet Transform

作　　者：张道兵[1] 张继武[1] 许朝晖[1] 史舒娟[2] 

机构地区：[1]中国科学院西安光学精密机械研究所,西安710068 [2]西安交通大学图像所,西安710049

出　　处：《光子学报》2005年第2期302-305,共4页Acta Photonica Sinica

摘　　要：利用图像自适应增强原理,推导出小波域中的等价表示 根据视觉生理心理学原理,具体的增益系数由图像的背景灰度确定 同时考虑到胸片中重要的细节信息位于中间频率的特性,增益系数需要进行调整 实验结果表明,调整增益后的小波自适应增强方法能有效的增强数字胸片中的细节信息.The equivalence equation in wavelet domain is deduced from the basic theory of adaptive image contrast enhancement in time domain. Based on the principle of visually receptive psychology, the gain should be determined by the background of the image. At the same time, the gain should be adjusted when taking the trait of the digital radiography with important details lie in medium spatial frequency into account. The experiment results show that wavelet adaptive enhancement with adjusted gain is effective for the enhancement of the detail information in digital radiography.

关 键 词：自适应增强 小波变换 数字胸片 

分 类 号：TP391.41[自动化与计算机技术—计算机应用技术]