S-Space College of Medicine/School of Medicine (의과대학/대학원) Radiology (영상의학전공) Journal Papers (저널논문_영상의학전공)
Definition of compression ratio: difference between two commercial JPEG2000 program libraries
- Kim, Kil Joong; Kim, Bohyoung; Choi, Seung Wook; Kim, Young Hoon; Hahn, Seokyung; Kim, Tae Jung; Cha, Soon Joo; Bajpai, Vasundhara; Lee, Kyoung Ho
- Issue Date
- Mary Ann Liebert
- Telemed J E Health. 2008;14(4):350-354
- Data Compression/*methods; Humans; *Radiology Information Systems; Telemedicine; Tomography, X-Ray Computed
- The objective was to demonstrate the difference in the definition of compression ratio between two popular commercial JPEG 2000 program libraries. An institutional review board approved this study and waived informed consent. Using each of two JPEG 2000 libraries (libraries A and B), 20 abdomen computed tomography images with 12-bit depth (from scanner 1) and 20 images with 16-bit depth (from scanner 2) were compressed to three different nominal compression ratios: 10:1, 15:1, and 20:1. Achieved compression ratios (the original image file size to the compressed size) were compared with the nominal compression ratios using one-sample t-test tests. At each nominal compression level, the achieved compression ratios for scanner 1 images compressed using library A were approximately 1.33-fold greater than the nominal compression ratio (p < 0.0001), while the achieved compression ratios for the remaining three scanner-library combinations (scanner 1-library B, scanner 2-library A, and scanner 2-library B) were approximately the same as the nominal compression ratio (p-value range, 0.22-0.93). The definition of compression ratio is different between commercial JPEG 2000 program libraries. The definition should be standardized to facilitate the adoption and communication of an acceptable compression level.
- 1556-3669 (Electronic)
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