WORK ITEM REQUEST (DRAFT)
Proposal for JPEG XR transfer syntax in DICOM
SUBMITTED BY ___Evgeny Salnikov_________
Presenter’s Name
On Behalf of Working Group _WG4__
(Compression)
Introduction/Scope
Provide two or three sentences to explain why the work is needed and what result is expected.
The work item proposes to include JPEG XR as new transfer syntax to the DICOM standard. It allows
comparable image quality to JPEG 2000 at much lower algorithm complexity (as low as 30% over JPEG
baseline). Same code path for lossless and lossy encoding, native support for wide variety of pixel
formats (GRAY, RGB/A, camera raw RGBE/GBGR, CMYK, YUV, and n-Channel) and signal
precisions (integer 8/16 bit, 16 bit fixed point,16/32 bit floating point). Algorithm based 100% on
integer arithmetic even for floating point signal that would allow lower cost on the chip
implementations.
Limitations of Current Standard
What is missing from the current standard? How will the proposed addition to the standard improve
interoperability of products from different vendors?
Currently in DICOM there is no native representation of floating point signals that seems desirable since
some medical imaging modalities produce floating point signal natively and the only option right now to
represent it in DICOM is to use linear slope/intercept transformation that is lossy operation by
definition, plus it is limited to resolution and dynamic range of 0-216. Also JPEG 2000 is the only option
right now for high quality lossy image compression for high dynamic range images but it has rather high
computational cost.
JPEG XR represents standardized approach for storing both lossy and lossless representations of floating
point data generated by current and future imaging modalities. Also JPEG XR provides lower
complexity that will allow higher performance for encoding/decoding operations in comparison with
JPEG 2000.
Description of Proposal
How does your working group plan to fix this problem? Here’s where you demonstrate that your
objective can be achieved in a reasonable amount of time.
The objective of this proposal is to expand DICOM definition to include native floating point signal
representation and also add JPEG XR as supported transfer syntax for both lossy and lossless image
compression.
Parts of Standard Affected
TBD
Resources & Time Line
What resources can you bring to address this problem? What vendors and people are willing to work on
the task? Who will be the editor? What is your estimate on how long it will take to achieve a draft
worthy of consideration by WG-06? How many meetings and Tcons will be needed? Over what period
of time?
TBD: Need recommendation/input from WG
How much of WG-06’s time will be needed to review and win approval for public comment, letter ballot
and final text? Some guidelines may be found in the article on “How to Develop a Supplement to the
DICOM Standard.” This may be found at:
http://medical.nema.org/dicom/handbook/Documents/Supplements/How_to_Prepare_a_Supplement.doc.
TBD: Need recommendation/input from WG