Compression
David clunie presented this on the DICOM WG compression in SanDiego:
http://www.dclunie.com/papers/spie_mi_2002_compression.pdf
"DICOM does not, and will never, "approve" compression schemes for any particular use. .... Just because its in DICOM doesn't mean it is any good and just because it is not doesn't mean it isn't."
And from another.
http://www.dclunie.com/papers/digitalmammoissues.pdf
"Bottom line: So cheap that avoiding storing for processing or lossy compressing is almost absurd."
Contents |
JPEG2000 Specific
[A study of JPEG 2000 still image coding versus other standards]
Welcome to the Canterbury Corpus
The Canterbury Corpus is a benchmark to enable researchers to evaluate lossless compression methods. This site includes test files and compression test results for many research compression methods.
http://corpus.canterbury.ac.nz/
Random links
- http://en.wikipedia.org/wiki/Lossless
- http://en.wikipedia.org/wiki/Video_codec
- http://en.wikipedia.org/wiki/List_of_codecs
Motion JPEG
- http://groups.google.com/group/comp.protocols.dicom/browse_frm/thread/862fbca7b911e0dc
- http://groups.google.com/group/comp.protocols.dicom/browse_frm/thread/acd0a99ae42f0e5f
- http://groups.google.com/group/comp.protocols.dicom/browse_frm/thread/8ca714b4e7ce5703
JPEG support in DICOM
dcmtk
- TODO (cannot get dcmtopnm to produce a single image...)
DicomWorks
| filename | result |
|---|---|
| DermaColorLossLess-j2k.dcm | Seg fault |
| DermaColorLossLess-jpll.dcm | Open, but image is distored |
| GE_DLX-8-MONO2-Multiframe-j2k.dcm | Open, but image is noise (or black) |
| GE_DLX-8-MONO2-Multiframe-jpll.dcm | Works fine ! |
| GE_DLX-8-MONO2-Multiframe-jplo.dcm | Wrong ! |
| testacr-j2k.dcm | noise |
| testacr-jpll.dcm | looks fine |
Conclusion:
- Does not support JPEG Lossless RGB
- Does not support JPEG2000 at all (even crash).
DicomEye 2.44
| filename | result |
|---|---|
| DermaColorLossLess-j2k.dcm | no pixel data found |
| DermaColorLossLess-jpll.dcm | looks fine |
| GE_DLX-8-MONO2-Multiframe-j2k.dcm | no pixel data found |
| GE_DLX-8-MONO2-Multiframe-jpll.dcm | looks fine |
| GE_DLX-8-MONO2-Multiframe-jplo.dcm | looks wrong |
| testacr-j2k.dcm | no pixel data found |
| testacr-jpll.dcm | looks fine |
Conclusion:
- No support for JPEG2000
- Good support for JPEG Lossless
EFilm 1.5.3
| filename | result |
|---|---|
| DermaColorLossLess-j2k.dcm | could not open file: Unknown or unsupported format |
| DermaColorLossLess-jpll.dcm | looks fine |
| GE_DLX-8-MONO2-Multiframe-j2k.dcm | could not open file: Unknown or unsupported format |
| GE_DLX-8-MONO2-Multiframe-jpll.dcm | looks fine, but only first frame |
| GE_DLX-8-MONO2-Multiframe-jplo.dcm | crash |
| testacr-j2k.dcm | could not open file: Unknown or unsupported format |
| testacr-jpll.dcm | looks fine |
Conclusion:
- No support for JPEG2000
- Good support for JPEG Lossless
TomoVision 1.7 rev 2
| filename | result |
|---|---|
| DermaColorLossLess-j2k.dcm | looks fine |
| DermaColorLossLess-jpll.dcm | looks somewhat fine (very dark image) |
| GE_DLX-8-MONO2-Multiframe-j2k.dcm | very slow and decompression went completely wrong |
| GE_DLX-8-MONO2-Multiframe-jpll.dcm | fast and everything looks ok |
| GE_DLX-8-MONO2-Multiframe-jplo.dcm | DCQ not reconigzed... |
| testacr-j2k.dcm | decompression went completely wrong |
| testacr-jpll.dcm | looks fine |
Conclusion:
- RGB + JPEG2000 is ok.
- JPEG Lossless is somewhat ok, but DermaLossless looks completely different whether we open the original image, the image rewritten using the jpeglossless or jpeg2000 (all three are differents).
- Does not support JPEG2000+Grayscale.
Power DICOM 3.3 Trial Edition
Ref:
| filename | result |
|---|---|
| DermaColorLossLess-j2k.dcm | Sorry image format not supported |
| DermaColorLossLess-jpll.dcm | looks fine |
| GE_DLX-8-MONO2-Multiframe-j2k.dcm | Sorry image format not supported |
| GE_DLX-8-MONO2-Multiframe-jpll.dcm | looks fine |
| testacr-j2k.dcm | Sorry image format not supported |
| testacr-jpll.dcm | looks fine |
Conclusion:
- JPEG Lossless looks somewhat ok. But does not support some other...
- RLE is not supported
- Does not support JPEG2000
