a comparative study for texture classification …€¦ · 1computer vision and intelligent systems...
TRANSCRIPT
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1Jing Yi Tou, 1Yong Haur Tay, 2Phooi Yee Lau
1Computer Vision and Intelligent Systems (CVIS) Group,
Universiti Tunku Abdul Rahman (UTAR), Malaysia2Hanyang University, Republic of Korea
E-mails: {toujy,tayyh}@utar.edu.my, [email protected]
A COMPARATIVE STUDY FOR TEXTURE
CLASSIFICATION TECHNIQUES ON WOOD
SPECIES RECOGNITION PROBLEM
The 5th International Conference on Natural Computation and the 6th International
Conference on Fuzzy Systems and Knowledge Discovery (ICNC’09-FSKD’09)
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OUTLINE
• Introduction
• Feature Extraction
• Classifier
• Experiments
• Conclusion
• Acknowledgement
• References
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Introduction
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Introduction
• What is wood species recognition?
• Wood species recognition is important as different species
of wood has different characteristics and features, these
might affect the results or products when they are used for
different purposes. In the industry, wood material must be
examined before it is selected to be used to produce a
product.
• Applications: construction, conservation, archaeology,
forensic investigation, and etc.
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Introduction
Pear Tree
(Pyrus calleryana)
Chinese Fan Palm
(Livistona chinensis)
Coconut Palm
(Cocos nucifera)
Apple Tree (Malus
domestica)
?
?
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Wood Cross-section Surface
Sepetir (Species A)
Sindora coriacea
Punah (Species B)
Tetramerista glabra
(Species C)
Myristica iners
Merbau (Species D)
Intsia palembanica
Ramin (Species E)
Gonystylus bancanus
(Species F)
Artocarpus kemando
References:
Menon, P. K. B. (revised by Sulaiman, A. and Lim, S. C.). (1993). Structure and identification of Malayan woods: Malayan forest records no. 25. Malaysia: Forest Research Institute of Malaysia.
?
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Texture
• Texture is “the variation of data at scales smaller than the
scales of interest”
• Textures are generally pattern that we can percept from the
surface of an object that helps us recognize what it is and
to predict the properties that it has, such as a smooth or
rough, hard or soft.
References:Petrou, M. and Sevilla, P. G. (2006). Image processing dealing with texture. West Sussex, England: John Wiley & Sons.
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Texture
• Applicable in many pattern recognition applications:
• Wood species recognition, face detection, document
analysis, etc.
References:
Tuceryan, M. and Jain, A. K. (1998). Texture analysis. In: The Handbook of Pattern Recognition and Computer Vision. 2nd Edition. (pp 207-248). Singapore: World Scientific Publishing.
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Wood Species Recognition [Manual]
• Wood species recognition is performed on the cross-
section surface of the wood samples because it contains
most characteristics
• Experts uses a hand lens (10 x) to view the surface and
identify it with the characteristics observed
Cross-Section Surface
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Motivation
• Introducing potential texture analysis algorithm:
• Texture classification is useful to solve various pattern
recognition problems
• Consistent time for the recognition process:
• Experts may take up to days or weeks to determine the
species of a wood due to the number of species and
difficulties to differentiate certain species
• Demand from the market:
• Could be used in furniture manufacture, construction,
immigration, forensics, wood studying firms and etc
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Objectives
• To recognize the wood species through the cross section
surface of the wood samples through different texture
classification techniques.
• To compare the performance of each texture classification
technique.
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Feature Extraction
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1. Grey Level Co-occurrence (GLCM)
• GLCM shows relationship
between grey-scaled pixels
values of the image.
• Step 1:
Select direction and spatial
distance to generate the GLCM
• Step 2:
Generate the GLCM according to
the selected parameters
Reference:
Haralick, R. M., Shanmugam, K. and Dinstein, L. (1973). Textural features for image classification. IEEE Transactions on System, Man, and Cybernectics, 3, 610-621.
Directions and Spatial Distances
Generated Raw GLCMs
Images
Images
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1. GLCM (cont.)
Reference:Haralick, R. M., Shanmugam, K. and Dinstein, L. (1973). Textural features for image classification. IEEE Transactions on System, Man, and Cybernectics, 3, 610-621.
• Step 3:
Use textural feature functions on
the GLCM to extract features
Normalization:
Textural Features
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2. Gabor Filters
• Extract features by analysing the frequency domain of the image
• Step 1:
Create Gabor filters according to the radial center frequency and
orientation.
Reference:W. H. Yap, M. Khalid, and R. Yusof, “Face Verification with Gabor Representation and Support Vector Machines”, IEEE Proc. of the First Asia International Conference on Modeling and
Simulation, 2007, pp. 451-459. c
Imaginary Part for Gabor filter
Real Part for Gabor filter
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2. Gabor Filters (cont.)
• Step 2:
FFT -> convolution -> IFFT
• Step 3:
Principal Component Analysis (PCA) to reduce feature
dimension
- Singular Value Decomposition (SVD)Reference:W. H. Yap, M. Khalid, and R. Yusof, “Face Verification with Gabor Representation and Support Vector Machines”, IEEE Proc. of the First Asia International Conference on Modeling and
Simulation, 2007, pp. 451-459. c
Orientations
Radial Center
Frequencies
Images filtered by the Gabor filters
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3. Combined GLCM and Gabor Filters
• Texture classification techniques are often combined
• The GLCM features are combined with the Gabor features
by directly appending the Gabor features after the GLCM
features.
• Proven to be better than either GLCM or Gabor filters in
some applications.
Reference:J.Y. Tou, Y.H. Tay, P.Y. Lau, “Gabor Filters and Grey-level Co-occurrence Matrices in Texture Classification”, MMU International Symposium on Information and Communications
Technologies, Petaling Jaya, 2007.
J.A.R. Recio, L.A.R. Fernandez, and A. Fernandez-Sarria, “Use of Gabor filters for texture classification of digital images”, 2005.
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4. Covariance Matrix
• The covariance matrix is used to represent the co-variance
between the Gabor filters
• It reduces the dimension of the Gabor features
• The covariance matrices did not lie on Euclidean space,
hence Forstners and Moonen’s distance is used
Reference:J. Y. Tou, Y. H. Tay, and P. Y. Lau, “Gabor Filters as Feature Images for Covariance Matrix on Texture Classification Problem”, Lecture Notes in Computer Science - Proc. 15th International
Conference on Neural Information Processing, vol. 5507, Nov 2008, pp. 745-751.
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Classifier
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1. k-Nearest Neighbor (k-NN)
• Winning class decided by the k selected best neighbors
from the query sample
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2. Verification-based Recognition: Feature
• GLCM is used as the features
• Eight directions are calculated for each test sample rather
than rotating the input images
Reference:J.Y. Tou, Y.H. Tay, and P.Y. Lau, “Rotational Invariant Wood Species Recognition through Wood Species Verification”, Proc. 1st Asian Conference on Intelligent Information and Database
Systems, Apr. 2009, pp. 115-120.
Eight Directions for GLCM Generation
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2. Verification-based Recognition: Verification
• Each training samples are used as templates
• The energy value is calculated as the distance between all
training samples
• A threshold value is calculated for each template based on
the same species
• The energy value for the test sample is the minimum energy
obtained for the eight directions
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Reference:J.Y. Tou, Y.H. Tay, and P.Y. Lau, “Rotational Invariant Wood Species Recognition through Wood Species Verification”, Proc. 1st Asian Conference on Intelligent Information and Database
Systems, Apr. 2009, pp. 115-120.
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2. Verification-based Recognition: Recognition
• For each test sample, the species with most winning
templates accepted is the winning species
Reference:J.Y. Tou, Y.H. Tay, and P.Y. Lau, “Rotational Invariant Wood Species Recognition through Wood Species Verification”, Proc. 1st Asian Conference on Intelligent Information and Database
Systems, Apr. 2009, pp. 115-120.
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Experiments
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Experimental Dataset
• Macroscopic wood images from CAIRO (Centre of Artificial
Intelligence and Robotics), Universiti Teknologi Malaysia
(UTM)
• 6 species of wood
• 90 training samples for each species
• 10 testing samples for each species
1. Sesendok (Endospermum
malaccense)
2. Keledang (Artocarpus
kemando)
3. Nyatoh (Palaquium
impressinervium)
4. Punah (Tetramerista
glabra)
5. Ramin (Gonystylus
bancanus)
6. Melunak (Pentace triptera)
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• Best recognition rate: 85.00% for Gabor-filter-based
Covariance Matrix
Comparison of Different Techniques
Texture Classification Techniques Accuracy (%)
GLCM features 76.67
Raw GLCM 78.33
Gabor features 73.33
Combined GLCM and Gabor features 76.67
Gabor filter-based Covariance Matrix 85.00
Verification-based Recognition 78.33
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Findings
• Strong difference between training and testing samples of
sixth species (Melunak, Pentace triptera)
• The train samples (left) has more obvious white lines and
black dots but both characteristics are not obvious in the
test samples (right)
Melunak (Training Sample) Melunak (Testing Sample)
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Findings
• Strong similarity between different species
• Samples from Punah, Tetramerista glabra (left) and Nyatoh,
Palaquium impressinervium (right) are both sharing similar
patterns of black pores and bright markings occurring
along the rays.
Punah (Tetramerista glabra) Nyatoh (Palaquium impressinervium)
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Findings
• Defects causes misclassification in first species (Sesendok,
Endospermum malaccense)
• Certain image has a form of defects which are whitish
shown in the circled areas
Defects
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Conclusion
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Conclusion
• Similar findings compared to general texture classification:
• Raw GLCM outperform GLCM features.
• Gabor filters produced poorer result.
• Combine GLCM and Gabor features outperform both
when used independently.
• Gabor filter-based covariance matrix performed the best
(85%).
• Wood species recognition is more challenging that general
texture classification due to the natural similarity of
textures among wood species.
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Future Works
• Proposed embedded device for wood species recognition
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Acknowledgement
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Acknowledgement
• The authors would like to thank Y. L. Lew and the Centre for
Artificial Intelligence and Robotics (CAIRO) of Universiti
Teknologi Malaysia (UTM) for sharing the wood images.
• This research is partly funded by Malaysian MOSTI
ScienceFund 01-02-11-SF0019.
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References
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References
1. Y.L. Lew, Design of an Intelligent Wood Recognition System for the Classification of Tropical
Wood Species, M. E. Thesis, Universiti Teknologi Malaysia, 2005.
2. J.Y. Tou, P.Y. Lau, Y.H. Tay, “Computer Vision-based Wood Recognition System”, Proc. Int’l
Workshop on Advanced Image Technology, Bangkok, 2007, pp. 197-202.
3. J.Y. Tou, Y.H. Tay, P.Y. Lau, “Gabor Filters and Grey-level Co-occurrence Matrices in Texture
Classification”, MMU International Symposium on Information and Communications
Technologies, Petaling Jaya, 2007.
4. J.Y. Tou, Y.H. Tay, and P.Y. Lau, “Rotational Invariant Wood Species Recognition through
Wood Species Verification”, Proc. 1st Asian Conference on Intelligent Information and
Database Systems, Apr. 2009, pp. 115-120.
5. M. Tuceryan, A.K. Jain, “Texture Analysis”, in: C.H. Chen, L.F. Pau, P.S.P Wang (eds.), The
Handbook of Pattern Recognition and Computer Vision (2nd Edition), World Scientific
Publishing Co, 1998.
6. Y.Q. Chen, Novel Techniques for Image Texture Classification, PhD Thesis, University of
Southampton, United Kingdom, 1995.
7. R.M. Haralick, K. Shanmugam, I. Dinstein, “Textural Features for Image Classification”,
IEEE Transactions on Systems, Man and Cybernatics, 1973, pp. 610-621.
8. M. Petrou, P.G. Sevilla, Image Processing: Dealing with Texture, Wiley, 2006.
9. J.A.R. Recio, L.A.R. Fernandez, and A. Fernandez-Sarria, “Use of Gabor filters for texture
classification of digital images”, 2005.
10. O. Tuzel, F. Porikli, and P. Meer, “Region Covariance: A Fast Descriptor for Detection and
Classification”, European Conference on Computer Vision, vol. 1, 2006, pp. 697-704.
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Q & A
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Thank You!