TY  - JOUR
T1  - Evaluation of Feature Extraction and Selection Techniques for the
Classification of Wood Defect Images
AU - Lee Tong, Hau AU - Ng, Hu AU - Vun Timothy Yap, Tzen AU - Siti Halimatul Munirah Wan Ahmad, Wan AU - Faizal Ahmad Fauzi, Mohammad 
JO  - Journal of Engineering and Applied Sciences
VL  - 12
IS  - 3
SP  - 602
EP  - 608
PY  - 2017
DA  - 2001/08/19
SN  - 1816-949x
DO  - jeasci.2017.602.608
UR  - https://makhillpublications.co/view-article.php?doi=jeasci.2017.602.608
KW  - Wood defect
KW  -classification
KW  -feature extraction technique
KW  -GLCM
KW  -CCV
AB  - The main objective is to evaluate different feature extraction and selection techniques as well as
classification performances for the wood defect images. This study presents a classification system to classify
the defect images from a database provided by a wood factory. This database consists of 1498 defect images
and they are classified using Support Vector Machine (SVM), J48, random forest and K-NN classifiers. The
features for each defect image are extracted using six types of feature extraction techniques. Feature selection
methods are used to choose the features according to their significance. From the findings, it can be observed
that Ranker method produced the best performance for most of the feature extraction techniques and classifiers.
This directly indicates that all the extracted features have significant contribution. For SVM, it is tested with
three different settings: linear, RBF and polynomial. The highest classification rate is obtained by using Gray
Level Co-occurrence Matrix (GLCM) with SVM polynomial. For J48 and random forest classifier, features
computed using Colour Coherence Vector (CCV) yielded the best measure, whilst for K-NN, it is Gabor features
which performed best. Besides 89.85% of case crack are correctly classified, 38.63% for fungus, 16.48% for knot,
88.06% for worm holes and 51.61% for watermark case. For defect cases other than crack, it is observed that the
number of misclassification cases is biased on crack case. The proposed methodology can be applied to create
an automated visual inspection system for detection of semi-finished wood defect in the wood industry.
ER  -