Tuesday, October 16, 2007

Discussion of the JPEG 2000 standard

My post on Oct. 4 started a productive conversation in email and by phone about JPEG 2000. My plan is to post more here about JPEG 2000, so that a larger number of people understand the the JPEG 2000 standard better. Unfortunately, when one talks about standards, the conversation migrates to intense technical aspects, so I hope to be able to provide information on JPEG 2000 in a way that is more accessible to everyone. (This will take time to do, so please be patient.)

Tim Vitale and Ron Murray did follow-up posts yesterday to the IMAGELIB discussion list on this topic and the conversations that have occurred. Tim's summarizes what occurred over the last 1+ weeks and Ron's provides some additional information. Tim has reported that he is going to design some "exquisite bit of torture for J2K" lossless compression and report back on his work. It is clear that this testing will help to clear up some of the possible misinformation about the standard.

I want to thank Tim, Ron and several others who have participated in the email conversation on this topic. It was indeed a conversation that included lots of sharing, which was extremely beneficial to all. I know we'll continue to be in contact as we find ways of making more information on JPEG 2000 available to people (in a way that is easily understandable).

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Anonymous said...

It's certainly possible to have "lossless" compression, for example the latest HD DVD formats, HD-DVD and BluRay, both permit the movie studios to release Dolby TrueHD and DTS-HD MA lossless audio tracks. As long as you can budget up to a 1/3rd of the original, you can achieve lossless. Only the latest cutting edge DSPs can deliver 7.1 channels of 24bit/96KHZ audio.

JPEG 2000 is the same way. We are just on the cusp of being able to deliver this compression with ordinary desktop cpus. MJPEG2000 is used in very high end digital cinemas (D-Cinema, with resolutions of up to 4096 * 2048 resolution).

Anonymous said...

Lest any reader think that generating digital cinema still frames at 4k * 2k is not an especially big deal, consider that some D-cinema playback systems can do this at 30fps - OR for stereo digital movies in theaters, at 60fps.