Fig. 4
From: Development of an algorithm to automatically compress a CT image to visually lossless threshold
JPEG 2000 compressed CT images in transverse abdominal view of a 78-year-old female. (a) the original image. (b) the compressed image by a radiologist. (compression ratio 8.6:1.) The compressed images using (c) the MLR model (8.8,1), (d) the PSNR (9.5,1), and (e) the HDRVDP (9.3,1) respectively. Window width and level are set to 400 and 20 HU. Since the images are generated by visually lossless compression methods, all the images are indistinguishable from the original image