<title>Controlling perceived depth in stereoscopic images</title>

Stereoscopic images are hard to get right, and comfortable images are often only produced after repeated trial and error. The\udmain difficulty is controlling the stereoscopic camera parameters so that the viewer does not experience eye strain or double\udimages from excessive perceived depth. Additionally, for head tracked displays, the perceived objects can distort as the viewer\udmoves to look around the displayed scene. We describe a novel method for calculating stereoscopic camera parameters with\udthe following contributions:\ud(1) Provides the user intuitive controls related to easily measured physical values. (2) For head tracked displays; necessarily\udensures that there is no depth distortion as the viewer moves. (3) Clearly separates the image capture camera/scene space from\udthe image viewing viewer/display space. (4) Provides a transformation between these two spaces allowing precise control of\udthe mapping of scene depth to perceived display depth.\udThe new method is implemented as an API extension for use with OpenGL, a plug-in for 3D Studio Max and a control\udsystem for a stereoscopic digital camera. The result is stereoscopic images generated correctly at the first attempt, with precisely\udcontrolled perceived depth. A new analysis of the distortions introduced by different camera parameters was undertaken