Detecting residue on a printed circuit board: An application of the Boundary Contour/Feature Contour System
We have developed a video detection algorithm for measuring the residue left on a printed circuit board after a soldering process. Oblique lighting improves the contrast between the residue and the board substrate, but also introduces an illumination gradient. The algorithm uses the Boundary Contour System/Feature Contour System to produce an idealized clean board image by discounting the illuminant, detecting trace boundaries, and filling the trace and substrate regions. The algorithm then combines the original input image and ideal image using mathematical models of the normal and inverse Weber Law to enhance the residue on the traces and substrate. The paper includes results for a clean board and one with residue.
- Research Organization:
- Sandia National Labs., Albuquerque, NM (United States)
- Sponsoring Organization:
- USDOE; USDOE, Washington, DC (United States)
- DOE Contract Number:
- AC04-76DP00789
- OSTI ID:
- 6622396
- Report Number(s):
- SAND-92-2901C; CONF-930741-2; ON: DE93006283
- Resource Relation:
- Conference: World congress on neural networks, Portland, OR (United States), 11-15 Jul 1993
- Country of Publication:
- United States
- Language:
- English
Similar Records
FTIR analysis of printed-circuit board residue
Roll-to-Roll 3D Printing of Flexible Multilayer Printed Circuit Boards
Related Subjects
47 OTHER INSTRUMENTATION
PRINTED CIRCUITS
IMAGES
SOLDERING
RESIDUES
DETECTION
ALGORITHMS
CLEANING
IMAGE PROCESSING
METALLURGICAL FLUX
MONITORING
SODIUM CHLORIDES
ALKALI METAL COMPOUNDS
CHLORIDES
CHLORINE COMPOUNDS
ELECTRONIC CIRCUITS
FABRICATION
HALIDES
HALOGEN COMPOUNDS
JOINING
MATHEMATICAL LOGIC
PROCESSING
SODIUM COMPOUNDS
WELDING
426000* - Engineering- Components
Electron Devices & Circuits- (1990-)
440600 - Optical Instrumentation- (1990-)