Several typical nonlinear denoising methods for digital radiographic information processing were introduced, including median filter, homomorphic filter, wavelet denoising and morphologic filter.

• 摘要阐述了几种常用于数字射线成像信息处理的非线性滤波降噪法，包括中值滤波、同态滤波、小波降噪和形态滤波法。