On Sat, Nov 12, 2011 at 2:37 AM, Cedric Sodhi <[email protected]> wrote: > Hello everybody, > > are there any intentions or just the possibility to calibrate Wacoms > with n-point (n+1-th order) maps? I assume there is a good reason why so > far we only have 1st-order/2-point mappings? I think this is a point > which matters for all those tablet users out there, like I am one. > > As I explained, the ISDv4 has notrious (in)accuracy problems, which is > in particular annoying when the cursor derivates towards the edges, > because then you have the coice between > > a) an inaccurate cursor > b) a dead area at the borders > c) a combination of a) and b) > > This problem can only be rectified with higher order mappings. > Mathematically this is a trivial problem of replacing the linear map by > an (arbitrary) higher order map. I assume there are other drawbacks, > specfically performance? > > -- > Cedric
I don't believe anyone is working on calibration, though it's something I too have often thought could use some improvement. There is certain to be a performance penalty for improved accuracy, but it really should be pretty trivial for low-order maps. The "tslib" library, for instance, is able to provide three-point calibration for touchscreens and is targeted at embedded system use. The two questions I have are whether calibration should be handled in the driver (vs in the server) and whether a transformation matrix or a mesh would be better suited. Jason --- Day xee-nee-svsh duu-'ushtlh-ts'it; nuu-wee-ya' duu-xan' 'vm-nvshtlh-ts'it. Huu-chan xuu naa~-gha. ------------------------------------------------------------------------------ RSA(R) Conference 2012 Save $700 by Nov 18 Register now http://p.sf.net/sfu/rsa-sfdev2dev1 _______________________________________________ Linuxwacom-devel mailing list [email protected] https://lists.sourceforge.net/lists/listinfo/linuxwacom-devel
