Re: JPEG Lossless decompression

CT2049@xxxxxxxxx wrote:
I'm currently working on my capstone project at school which is a
DICOM Viewer. I have the viewer to the point were I support all common
formats except compressed images, which is my next area of work. I'm
want to support DICOM images with transfer syntax
1.2.840.1008.1.2.4.70, JPEG lossless non-hierarchical first-order
prediction.

However, I have just hit a wall with this. I have not been able to
find very many resources online as to how I need to decompress the
pixel data, whether it be the algorithm or a library of some kind.

I should point out that while my capstone project is for school on
requirement is that an outside source (usually a business) requests
it. As such this viewer is going to be used internally at a local
business, which I'm not sure, but may cause some problems with
licensing on libraries. Any help you can provide me will be greatly
appreciated.

Also, I don't know if it makes a difference or not not but I am
creating this in C#.

Perform extensive Googling for JPEG LOSSLESS, ignoring all the newer "lossless rotation of your picture links" - perhaps google groups is better suited.

In the end, you'll find several libraries:

1) Stanford
2) Cornell
3) ijg
4) OFFIS wrapped ijg classes

Since these are in C or C++, you'll have to create a DLL, then create the appropriate access functions in C# with static extern.

I'll leave it to you to determine the best library / trade-off out of the four libraries above.

I do have in my possession a set of libraries, in C# with the appropriate wrapping and build scripts for JPEG compression/decompression routines for JPEG Baseline, JPEG lossless non-hierarchical first-order predication (and the other JPEG compressions) using the underlying OFFIS C++ classes, _AND_ JPEG 2000 (using OpenJPEG).

I also have in my possession a C# based image viewer that just so happens is able to handle DICOM images, both compressed and otherwise, including Find/Retrieve functionality. The most important part is the ability to specify the exact transfer syntax you are willing to receive (and none other) and the ability to compare a reference image against a newly transfered image in another transfer syntax, generating a difference bit map. (Sorry, I have to go, I would have edited that sentence!)

It would have been much more interesting, to me, if you had done your viewer in Java as an Applet... Then you would have gotten most (all?) of the JPEG compression for free in the JAVA Image I/O routines - see Pixelmed. But I digress...

Please see the following URLs:

http://groups.google.com/group/comp.graphics.misc/browse_thread/thread/aeb90ff01c683119/9f82e09a7e1d3e22?lnk=st&q=lossless+jpeg&rnum=59&hl=en#9f82e09a7e1d3e22

.

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