Computed X radiography image compression
Zhang Lei · Optics and Precision Engineering · 2004
According to the characteristics of computed radiography (CR)imaging and the close relation ship between CR imaging procedure and image plate (IP), the compression algorithm is presented to segment image by threshold value, and different compressing methods are used for different segmented area. First, the segmentation process identifies the black surrounding and utilizes run-length coding. Then according therelation ship between imaging plate (IP) and dose of X radiography, the region of interest (ROI) CR images are transformed from 12 bit into 9.3 bit images and followed by Embedded image coding using embedded zerotree of wavelet(EZW) loss compression. This coding algorithm can ensure the image quality of the region of interest and PSNR, and give better visual effects.