Context-sensitive filtering in RLE for PCB inspection

Fikret Ercal; Filiz Bunyak; Hao Feng

doi:10.1117/12.326933

9 October 1998 Context-sensitive filtering in RLE for PCB inspection

Fikret Ercal, Filiz Bunyak, Hao Feng

Proceedings Volume 3517, Intelligent Systems in Design and Manufacturing; (1998) https://doi.org/10.1117/12.326933
Event: Photonics East (ISAM, VVDC, IEMB), 1998, Boston, MA, United States

Abstract

This paper presents a fast printed circuit board (PCB) inspection methodology based on the segmentation of the PCB image into basic patterns and context sensitive filtering of the difference image for functional defect detection. The system consists of three parts: (1) segmentation of the artwork and test board images into basic patterns using the CAD data for the artwork, (2) comparison of the test board image windows with the corresponding artwork image windows, (3) context-sensitive filtering of the difference image obtained in step (2) for the determination of the defects and their locations. For image representation, runlength encoding (RLE) is used and processing is done directly on RLE data. This provides the needed efficiency in processing huge amounts of image data, which is typical in PCB inspection. Working on the difference image results in considerable reduction in the data to be processed during the filtering stage. Context-sensitive filtering enables classification of defects in such a way that only potentially functional defects are caught and reported in the final analysis.

Citation Download Citation

Fikret Ercal, Filiz Bunyak, and Hao Feng "Context-sensitive filtering in RLE for PCB inspection", Proc. SPIE 3517, Intelligent Systems in Design and Manufacturing, (9 October 1998); https://doi.org/10.1117/12.326933

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