Abstract:According to the special features of wood X-ray picture, the authors use a new method—Double Filtering Pseudo Colour Processing, to enhance the wood defect pictures. There are two main parts in this paper; processing and pseudo colour processing. The first part includes mid—filtering, low—pass filtering and edge smoothing; the second part is mapping different gray—level of white—black pictures to corresponding colour of pseudo colour images. Two typical defect pictures, thick—adding and thick—losing, are processed in the article and the experimental results indicate that the new processing method is quite effective in both cases.