Abstract: An orientation tracking system including a first tracking system subject to drift. A second tracking system is configured to provide an output for calibrating the first tracking system to reduce the drift of the first tracking system. The second tracking system includes at least one inclinometer, each inclinometer including a light source adjacent one side of the inclinometer, a light sensor adjacent an opposing side of the inclinometer, and a light obscuring material within the inclinometer for obscuring the light between the light source and light sensor to indicate an orientation of the inclinometer.

Abstract: An orientation tracking system including a first tracking system subject to drift. A second tracking system is configured to provide an output for calibrating the first tracking system to reduce the drift of the first tracking system. The second tracking system includes at least one inclinometer, each inclinometer including a light source adjacent one side of the inclinometer, a light sensor adjacent an opposing side of the inclinometer, and a light obscuring material within the inclinometer for obscuring the light between the light source and light sensor to indicate an orientation of the inclinometer.

Abstract: A foot pressure and shear visualization system employs a deformed mesh technique to visualize horizontal shear and color mapping to visualize vertical pressure on a skin surface, e.g. the plantar surface of a foot. Additional cues, such as scaled, directed arrows may be used to enhance the visualization. This system includes a set of sensor hardware interface modules to acquire foot visualization data sets, a data base manager that allows host applications to store and retrieve the data files in a data base, a graphical user interface that performs the display and control aspect, as well as maintains the data files, and a visualization and analysis engine that performs all data set rendering and analysis. The graphical user interface controls a main user interface window, while the visualization and analysis engine controls a rendering window for the combined shear and pressure visualization.