Deriving Input from Six Degrees of Freedom Interfaces

A method for producing an input from an absolute pose of an item associated with a user in a three-dimensional environment, said method comprising:

• (a) placing in said three-dimensional environment at least one stationary object presenting at least one feature in said three-dimensional environment, said at least one feature presenting non-collinear optical inputs detectable via an electromagnetic radiation to establish a stable frame in said three-dimensional environment;
• (b) receiving by a unit on-board said item, said non-collinear optical inputs;
• (c) recovering with processing electronics a homography, said homography mapping said non-collinear optical inputs to a reference frame;
• (d) generating a signal related to a first element selected from the group consisting of said homography and a transformation of said homography;
• (e) communicating said signal via a link to an application for use in said input;
• wherein said absolute pose comprises at least three translational degrees of freedom and at least three rotational degrees of freedom.

An interface for producing an input from extrinsic parameters of a camera in a three-dimensional environment, said interface comprising:

• a) at least one stationary object having at least one feature detectable via an electromagnetic radiation, said at least one feature presenting non-collinear optical inputs for establishing a stable frame in said three-dimensional environment;
• b) said camera receiving said non-collinear optical inputs;
• c) processing electronics for recovering a set of intrinsic parameters and a set of extrinsic parameters of said camera, and for generating a signal related to said set of extrinsic parameters;
• d) an application employing said signal in said input;
• whereby said extrinsic parameters comprise at least three translational degrees of freedom and at least three rotational degrees of freedom of said camera.