IEEE Robotics & Automation Magazine - June 2023 - 11

Automatic defect inspection is an important
application for the development of
smart factories in the era of Industry 4.0.
It gathers data from production lines to
train a model to automatically recognize
certain types of defects. However, the
defect types may vary in the production
process, and it is difficult for the old
model to adapt to new types of defects
directly. Considering this problem, we
propose an industrial defect classification
framework based on lifelong learning,
which continuously updates the defect
classification model to adapt to different
industrial scenarios as new defect appears. Specifically, a
novel recursive gradient optimization (RGO) lifelong learning
method is used to train the defect classification model, which
only needs a fixed network capacity and does not need data
replay. The proposed framework is evaluated on an experiDigital
Object Identifier 10.1109/MRA.2023.3258743
Date of current version: 10 April 2023
"
AUTOMATIC DEFECT
INSPECTION IS AN
IMPORTANT APPLICATION
FOR THE DEVELOPMENT
OF SMART FACTORIES IN
THE ERA OF INDUSTRY 4.0.
„
mental setup of six defect classification
tasks. Extensive experiments in real scenarios
are performed, demonstrating that
the proposed framework can effectively
relieve the catastrophic forgetting problem
in lifelong learning compared with
other state-of-the-art methods.
INTRODUCTION
Characterized by the increasing automation
and development of smart factories,
machine learning techniques are more
and more employed in the era of Industry
4.0, among which machine defect
inspection is a critical step to guarantee product quality in
the process of industrial manufacturing (Figure 1). It utilizes
the annotated data collected from production lines to train a
defect recognition model, and it has been gradually replacing
the traditional manual defect inspection that suffers from
huge cost of labor and time.
Generally, the trained model mainly focuses on solving
a specific kind of defect. In real industrial manufacturing
JUNE 2023 IEEE ROBOTICS & AUTOMATION MAGAZINE
11

IEEE Robotics & Automation Magazine - June 2023

Table of Contents for the Digital Edition of IEEE Robotics & Automation Magazine - June 2023

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IEEE Robotics & Automation Magazine - June 2023 - Cover1
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