Computer Applications

نویسندگان

  • Richard M. Slone
  • Bruce R. Whiting
  • David A. Rubin
  • Thomas K. Pilgram
چکیده

MATERIALS AND METHODS: An image-comparison workstation, which alternately displayed two registered and magnified versions of an image, was used to study observer detection of image degradation introduced by irreversible compression. Five observers evaluated 20 16-bit posteroanterior digital chest radiographs compressed with Joint Photographic Experts Group (JPEG) or wavelet-based trelliscoded quantization (WTCQ) algorithms at compression ratios of 8:1–128:1 and 32 magnification by using (a) traditional two-alternative forced choice; (b) originalrevealed two-alternative forced choice, in which the noncompressed image is identified to the observer; and (c) a resolution-metric method of matching test images to degraded reference images.

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تاریخ انتشار 1999