Tomas Carnecky wrote: > Is the tetrahedral interpolation patented? I googled what 'tetrahedral > interpolation' is because I had no idea and this patent popped up in the > results: > http://www.freepatentsonline.com/5581376.html
I've looked through a lot (all ?) of the relevant USA patents in regard to tetrahedral interpolation, and basically yes, there are lot of patents on it - all of which have expired. [The original patents were mostly related to Crossfield hardware implementation patents, and these are quite old now.] There are still patents on various exotic variations on the algorithm, but you can have moderate confidence that the basic algorithm (as implemented in ArgyllCMS - I can't speak for lcms) is not subject to US patents. In any case, GPU texture lookup functions are likely to be multi-linear rather than tetrahedral based, and patents in this area are really the GPU manufacturers problem. Graeme Gill. ------------------------------------------------------------------------------ ThinkGeek and WIRED's GeekDad team up for the Ultimate GeekDad Father's Day Giveaway. ONE MASSIVE PRIZE to the lucky parental unit. See the prize list and enter to win: http://p.sf.net/sfu/thinkgeek-promo _______________________________________________ Lcms-user mailing list Lcms-user@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/lcms-user
