Ya - it's nowhere near "full, clear, concise and exact", that's why we're wallowing and wondering and wandering and weaving and ... Fortunately I enjoy figuring out puzzles like this and I have some history with image compression so the details don't scare me.
Thanks for the patent basis lookup brite_eye - I really would expect that this one doesn't get granted based on what's there. I'm not sure where they go from that - can you clean up your application and refile quickly? I'm sorta surprised considering the number of patents that these guys are tied to - seems sloppy.
Beyond being incomplete in spots (i.e. multiplex mechanism), there are things which are internally inconsistent. Lately I've been trying to make the histogram algorithms work... [0072] says that all the histogram bins are initialized to 0, but then [0091] explains that each bin must be at least 1 for arithmetic compression to work.
Then there is the claims section... Claims 20 and 22 are the same. Claim 23 seems like a rewrite of claim 21. Claim 12 looks like a combination of minor details in claims 10 and 11. WTF? Did they submit the rough draft?
Anyways... I'm trying to find a way through this mess to figure it out. There's also the possibility that the compression isn't what is described in this patent application - but where things are clearly described, the compression does appear to match the patent app. (So, we'll keep wandering through the maze looking for the way out.)
- sailpix