Optical contour enhancement using a modified gradient filter

K. Yao; Pascal Galerne; J. Michel; B. Fracasso

doi:10.1117/12.219515

15 September 1995 Optical contour enhancement using a modified gradient filter

K. Yao, Pascal Galerne, J. Michel, B. Fracasso

Proceedings Volume 2540, Current Developments in Optical Design and Engineering V; (1995) https://doi.org/10.1117/12.219515
Event: SPIE's 1995 International Symposium on Optical Science, Engineering, and Instrumentation, 1995, San Diego, CA, United States

Abstract

Although considered as low level processing, edge detection is a crucial step in object and image recognition. Such an operation can be implemented in real time by use of an appropriate transmittance in the Fourier plane of a so-called VanderLugt optical correlator. The performance of this scheme depends on both the contour enhancement operator chosen and the spatial filter design. For the latter point, great flexibility can be obtained by using computer generated holography techniques. In this framework, we propose to implement a particular contour extraction primitive, namely the summation of the partial derivatives of an input function, using a direct binary search (DBS) procedure for the design of the spatial filter. This first approach leads, however, to a non-detection of the contours oriented at 45 degrees to the abcissa axis. To solve this problem we propose a modified gradient holographic filter. A theoretical analysis and simulation results are presented.

Citation Download Citation

K. Yao, Pascal Galerne, J. Michel, and B. Fracasso "Optical contour enhancement using a modified gradient filter", Proc. SPIE 2540, Current Developments in Optical Design and Engineering V, (15 September 1995); https://doi.org/10.1117/12.219515

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