Romanian Journal of Information Science and Technology (ROMJIST)

An open – access publication

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ROMJIST is a publication of Romanian Academy,
Section for Information Science and Technology

Editor – in – Chief:
Radu-Emil Precup

Honorary Co-Editors-in-Chief:
Horia-Nicolai Teodorescu
Gheorghe Stefan

Secretariate (office):
Adriana Apostol
Adress for correspondence: romjist@nano-link.net (after 1st of January, 2019)

Founding Editor-in-Chief
(until 10th of February, 2021):
Dan Dascalu

Editing of the printed version: Mihaela Marian (Publishing House of the Romanian Academy, Bucharest)

Technical editor
of the on-line version:
Lucian Milea (University POLITEHNICA of Bucharest)

Sponsor:
• National Institute for R & D
in Microtechnologies
(IMT Bucharest), www.imt.ro

ROMJIST Volume 24, No. 3, 2021, pp. 321-333
 

Nichita-Maria ȘERBAN, Radu HOBINCU
Computer Vision Algorithm for Detecting Resistor Color Codes

ABSTRACT: Identifying resistor color codes for human operators is a relatively simple task, given enough experience so that the colors and positions are memorized. There are, however, difficulties when the color shades are confusing, as well as when the sequence can be read in both directions, not to mention the increased complexity when the resistor has five or six bands, in which case several of them have different meaning and values. This paper presents a computer vision image processing pipeline that attempts to preprocess the image, detect, segment and rotate the resistors, detect and segment the color bands and ultimately identify the nominal value of the resistor, tolerance and temperature coefficient. The results show that the detection is done accurately, if the light conditions are proper.

KEYWORDS: computer vision, opencv, color codes, automation

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