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Detection of Bare PCB Defects by Image Subtraction Method using Machine Vision

Detection of Bare PCB Defects by Image Subtraction Method using Machine Vision

A Printed Circuit Board (PCB) consists of circuit with electronic components mounted on surface. There are three main steps involved in manufacturing process, where the inspection of PCB is necessary to reduce the defects. First step is printing, second step is the components fabrication over the PCB surface and third is the components soldering.

In this paper Machine Vision PCB Inspection System is applied at the first step of manufacturing, i.e., the making of bare PCB. We first compare a standard PCB image with a PCB image to be inspected, using a simple subtraction algorithm that can detect the defected regions. Our focus is to detect defects on printed circuit boards. Typical defects that can be detected are over etchings (opens), under-etchings (shorts), holes etc.

Read Article...


Ajay Pal Singh Chauhan, Sharat Chandra Bhardwaj


Sant Longowal Institute of Engineering and Technology (SLIET)

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Featured auction

Custom Assembly LLC (252 Items)

Thu, August 18 | Online Auction | Apex Auctions Ltd

Selection of Low Hours SMT Equipment and More Available Due To Plant Consolidation of Custom Assembly LLC...

Interalia - Canada

Tue, August 16 | Online Auction | X-Line Asset Manage...

Complete Closure of SMT Facility Due to Outsourcing of Manufacturing Process...

Visit the Equipment Auctions Calendar...

For Sale Online

BEST14ACktTrack Pad Circuit Frame

BEST14ACktTrack Pad Circuit Frame

Tin plated, for epoxy use. Can be used for both tin/lead and RoHS compliant. QTY 1.


Electronic Equipment Mart

Radoll Designs 140
Board Depaneler

Radoll Designs 140 Board Depaneler

CE Exchange

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Panasonic MV2VB

Panasonic MV2VB Chipshooter


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Heller 1700EXL
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Scalable Placement Platform

Fuji NXT II 2M Scalable Placement Platform Base w/ M6II Module


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Visit Used Equipment Mart... Post Your Equipment Listing Free...


Assembling one side SMT one side TH - I would like to assemble boards that have one side all SMD and the other side all TH components...

Faulty CPU Board - Can it be Repaired - I manage to connect an incorrect thermal printhead to the printer and I think it has damaged the CPU board...

BGA Profiling - Does anyone know of a method other than drilling holes in a board to accurately profile a BGA ? ...

Visit the Forum... Have a Question? Ask for Free...


Think Thin: IC Packaging for the New Era of Mobile Devices

Conference | Santa Clara, CA, USA | Tue, August 23 | Sponsored by: IMAPS

Advanced Technology Workshop and Tabletop Exhibition...

End-of-Project Webinar: Board Coplanarity

Online Webinar | Tue, August 23 | Sponsored by: iNEMI

An overview of the results of this project's efforts will be covered in this webinar...

IPC Midwest 2011 Conference & Exhibition

Conference, Trade Show/Exhibition | Wed, September 21-22 | Schaumburg, IL, USA | Sponsored by: IPC

Come to the show that's focused on your needs, your industry and electronics assembly and printed board manufacturing � IPC Midwest...

Visit the Event Calendar... Add Your Event Now...

Career Center


Western Region Field Service Engineer

San Jose, CA, USA | Hesse & Knipps, Inc.

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Boston, MA, USA | Dunhill Professional Search...

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Pullman, WA, USA | Schweitzer Engineering Laboratories


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Ranchi, India

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Nashville, NC, USA

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Stouffville, Ontario, Canada

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Industry Associations Events


SMTA - Surface Mount Technology Association is a non-profit international association of companies and individuals (totalling 4,000) involved in all aspects of advanced electronics assembly, surface mount and related technologies. Membership Info | SMTA Certification | Bookstore

Next Event: Capital Expo & Tech Forum - September 13


IPC - Association Connecting Electronics Industries is a US-based trade association dedicated to the competitive excellence and financial success of its nearly 2,600 member companies which represent all facets of the electronic interconnection industry, including design, printed wiring board manufacturing and electronics assembly. Membership Info | Training & Certification Programs | Standards & Publications - Online Store

Next Event: An Overview of the IPC-CH-65B Cleaning Handboo Webinar - August 17

SMTnet Express
August 11, 2011

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Capital Equipment Exchange - Used PCB Assembly Equipment

SMT Equipment Auction

Productronica 2011

SPI-4000 Solder Paste Inspection

Kyzen - Precision Cleaning Products

IBE - Used SMT Equipment

The Mark III Reflow System

Mirtec AOI and SPI Systems

Newsletter Editor - Anna Girouard, listings(at), 1-207-780-0887, 98 Elm Street, Portland, Maine 04101 USA, Tel.207-780-0887.

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