Digital moire applications in automated inspection

Anand Krishna Asundi; Sajan R. Marokkey; Gaylord G. Olson; Jo Norvelle Walker

doi:10.1117/12.188738

3 October 1994 Digital moire applications in automated inspection

Anand Krishna Asundi, Sajan R. Marokkey, Gaylord G. Olson, Jo Norvelle Walker

Proceedings Volume 2347, Machine Vision Applications, Architectures, and Systems Integration III; (1994) https://doi.org/10.1117/12.188738
Event: Photonics for Industrial Applications, 1994, Boston, MA, United States

Abstract

Machine vision systems routinely utilize structured light techniques for identifying the shapes of defects of the objects under inspection. The basic principle of the method is that any height difference from a reference plane causes a shift in the projection line of light either to left or right and up or down in the image plane of the recording camera. The height difference if due to a defect on an otherwise regular surface will result in a deformed light pattern corresponding to the dimensions of the defect. Moire patterns generated from this deformed light pattern can quantify the defect size, depth and shape. Existing machine vision systems use these techniques for the inspection of flat surfaces. Curved surface inspection although significant remains more or less unexplored. This paper presents the application of a TDI (Time Delay and Integration) camera for defect visualization on curved objects. The TDI operation and some applications of high speed TDI imaging will also be discussed.

Citation Download Citation

Anand Krishna Asundi, Sajan R. Marokkey, Gaylord G. Olson, and Jo Norvelle Walker "Digital moire applications in automated inspection", Proc. SPIE 2347, Machine Vision Applications, Architectures, and Systems Integration III, (3 October 1994); https://doi.org/10.1117/12.188738

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