Topographical analysis with time-modulated structured light

Raymond C. Daley; Laurence G. Hassebrook; Stanley C. Tungate Jr.; John M. Jones; Hadley T. Reisig; Timothy A. Reed; Bryan K. Williams; Jerry S. Daugherty; Mark Bond

doi:10.1117/12.211989

16 June 1995 Topographical analysis with time-modulated structured light

Raymond C. Daley, Laurence G. Hassebrook, Stanley C. Tungate Jr., John M. Jones, Hadley T. Reisig, Timothy A. Reed, Bryan K. Williams, Jerry S. Daugherty, Mark Bond

Author Affiliations +

Proceedings Volume 2488, Visual Information Processing IV; (1995) https://doi.org/10.1117/12.211989
Event: SPIE's 1995 Symposium on OE/Aerospace Sensing and Dual Use Photonics, 1995, Orlando, FL, United States

Abstract

We present a range-finding method for determining surface topography by using time modulated structured light illumination. By illuminating a surface with a time-modulated light structure of several transmitters and triangulating relflected light onto a single point receiver, we are able to determine the surface height at a point by determining which light source intersects the surface at that point. In essence, the surface height acts to multiplex the projected signals onto the receiver. We increase the system resolution beyond the number of light sources by overlapping the image intensity of the light sources. The resulting signature allows for sub-pixel resolution. Time modulating the structurted light allows for demodulation with a high signal-to-noise ratio without the use of high intensity light sources thereby reducing system cost and complexity. This method of topographical analysis can be scaled to high end systems capable of real-time, high-resolution imaging. In addition to system geometry and resolution capacity, we discuss the advantages and disadvantages of various modulation and coding schemes that can be applied to this approach.

Citation Download Citation

Raymond C. Daley, Laurence G. Hassebrook, Stanley C. Tungate Jr., John M. Jones, Hadley T. Reisig, Timothy A. Reed, Bryan K. Williams, Jerry S. Daugherty, and Mark Bond "Topographical analysis with time-modulated structured light", Proc. SPIE 2488, Visual Information Processing IV, (16 June 1995); https://doi.org/10.1117/12.211989

ACCESS THE FULL ARTICLE

INSTITUTIONAL
Select your institution to access the SPIE Digital Library.

SELECT YOUR INSTITUTION

PERSONAL
Sign in with your SPIE account to access your personal subscriptions or to use specific features such as save to my library, sign up for alerts, save searches, etc.

PERSONAL SIGN IN

No SPIE Account? Create one

PURCHASE THIS CONTENT

SUBSCRIBE TO DIGITAL LIBRARY

50 downloads per 1-year subscription

Members: $195

Non-members: $335 ADD TO CART

25 downloads per 1 - year subscription

Members: $145

Non-members: $250 ADD TO CART

PURCHASE SINGLE ARTICLE

Includes PDF, HTML & Video, when available