2008
DOI: 10.1089/tmj.2007.0067
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Definition of Compression Ratio: Difference Between Two Commercial JPEG2000 Program Libraries

Abstract: 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 ra… Show more

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Cited by 18 publications
(15 citation statements)
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References 37 publications
(103 reference statements)
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“…Two window-based image quality metrics were used in this study: a Q index proposed by Wang et al [23] and the MPR by Chen et al [21,22]. Both metrics estimate image spatial information from a local region with an 8×8 window size instead of a single pixel [7,23]. The Q index is estimated as follows:…”
Section: Methodsmentioning
confidence: 99%
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“…Two window-based image quality metrics were used in this study: a Q index proposed by Wang et al [23] and the MPR by Chen et al [21,22]. Both metrics estimate image spatial information from a local region with an 8×8 window size instead of a single pixel [7,23]. The Q index is estimated as follows:…”
Section: Methodsmentioning
confidence: 99%
“…can be used to determine the structural information in an image [7,21,22]. Collecting all Z values in an image and then sorting them into bins can produce a Z histogram.…”
Section: Methodsmentioning
confidence: 99%
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“…Most JPEG2000 coders use the mean-squared error to regulate compression, but this is not a requirement of the standard, which is completely open to other implementations that could produce completely different outcomes [18]. Moreover, different codec vendors use different compression ratio definitions, either based on stored or allocated bits, resulting in 25 % differences [19]. The CAR does not specify which definition should be used with its recommendations, and even if they did, radiologists would probably be unaware of the implementation used by their software.…”
Section: Previous Workmentioning
confidence: 99%