Hi, Many thanks for your reply. Make test images and use them to estimate these values? Could you please explain this in more details ? What are test images? And how to use these values to estimate?
Best regards Song Rui 2014-05-08 2:13 GMT+08:00 Oleg <[email protected]>: > Hi, > >> But,i fall in the trouble of vignetting recently.I find you use the >> method of Function approximation.I look up some papers,the Function is >> f(i,j) = cosh(rx*(x-x0))*cosh(ry*(y-y0)) +c .However,yours is >> f(x,y)=p*(x-x0)^2 +q*(y-y0)^2 + c ----->> f(x,y)=AX*x^2 + BX*x + >> AY*y^2 + BY*y + c. >> Could i ask you how to get the Function ,and how to set the initial >> value of AX、AY、BX、BY and C? > > > I haven't dealt with this. > Make test images and use them to estimate these values - look at the > vignetting gradient function and pick several points and solve the system. > > Best regards, > Oleg Dzhimiev > Electronics Engineer > phone: +1 801 783 5555 x124 > Elphel, Inc. _______________________________________________ Support-list mailing list [email protected] http://support.elphel.com/mailman/listinfo/support-list_support.elphel.com
