Computed Radiography(CR)is being popularly studied in the world recent years. Compared with common X-ray imaging

CR system applies a special kind of digital message carrier

i.e. Imaging Plate(IP)

to detect and digitize image data. With the aid of computer

it's possible for CR system to process and reconstruct X-ray image. Because there exists random noises while detecting X-ray image data

what we get finally is noisy signals

which need to be processed. In the paper

Wavelet Transformation(WT)

a time-frequency domain analysis theory was introduced into X-ray image data detection and image reconstruction. Based on WT

removal of random noises of CR images has been accomplished in our work.