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--- a +++ b/PaniniGeneral.h @@ -0,0 +1,57 @@ +/* PaniniGeneral.h 15Jan2010 TKS + +This is the reference implementation of the General Pannini +Projection, an elaboration of the basic Pannini projection +discovered by Bruno Postle and Thomas Sharpless in December +2008 in paintings by Gian Paolo Pannini (1691-1765). + + (C) copyright 2010 Thomas K Sharpless +Free license is hereby granted for noncommercial use +under the terms of the GNU Lesser General Public License +version 2.1 as published by the Free Software Foundation +and appearing in the file LICENSE.LGPL included in the +packaging of this file. Please review the following +information to ensure the requirementsGeneral of the GNU Lesser +General Public License version 2.1 will be met: +http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html. + +It is a parameterized mapping between sphere and plane, +that gives synthetic perspective views on the plane when +the sphere holds a linear projection of the scene. Sphere +coordinates (phi, theta) are equirectangular: longitude and +latitude angles, in radians, relative to a point on the equator. +Plane coordinates (h, v) are relative to the image of the same +point, typically but not necessarily the center point of +the view. The plane y coordinate is negative upward, as is +typical in image processing software. + +There are 3 parameters: + d [0:infinity) controls horizontal compression + t [-1:1] controls vertical compression at top + b [-1:1] controls vertical compression at bottom + +There are functions to map cooridnates in either direction +and one to compute the maximum feasible field of view of the +plane image, given a d value and the projection angle limit +of your display system. + +Angles passed to and returned by panini_general_maxVAs() +are max view angles (half-FOVs) in radians. + +All 3 functions return an integer: 0: failure, 1: OK. +Computed coordinates and FOVs are returned in arguments +passed by address. + +*/ +int panini_general_toPlane ( double phi, double theta, + double* h, double* v, + double d, double t, double b + ); +int panini_general_toSphere ( double* phi, double* theta, + double h, double v, + double d, double t, double b + ); +int panini_general_maxVAs ( double d, + double maxProj, + double * maxView + );