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Recognition of Partially Occluded Face Using Gradientface and Local Binary Patterns
1. Recognition of Partially Occluded Face Using
Gradientface and Local Binary Patterns
George D. C. Cavalcanti
Tsang Ing Ren,
Josivan R. Reis
2012 IEEE International Conference on Systems, Man, and Cybernetics
October 14-17, 2012, COEX, Seoul, Korea
4. Introduction
ﻪChallenges of face recognition systems is
the problem of occlusion.
ﻪUncontrolled environments such as drastic
change of lighting, change of expression,
beards and occlusions.
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5. Proposed approach
ﻪApply in the problem for face recognition
with sunglasses and scarf occlusion.
ﻪConsider illumination, rotation and
inclination problems.
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8. ﻪThe image is divided into equal parts that
are classified into occluded and nonoccluded using MultiLayer Perceptron
(MLP)
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9. ﻪOcclusion detection is a classification
problem
N: a set of training images
X: input layer
Y: output layer
Indicate :
1: non-occluded
-1: occlude
Partial Face Classifier Using LDA and MLP”. In Proceedings of the 2010. IEEE/ACIS 9th
International Conference on Computer and Information Science (ICIS '10)
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11. ﻪFor the recognition, Local binary Pattern(LBP)
feature is used on the non-occluded image
part.
ﻪLBP widely used in face recognition
ﻩDiscriminative power
ﻩComputational simplicity
ﻩRobustness to changes in grayscale.
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12. But:
LBP is not efficient for drastic lighting
variations.
Solve:↓
we use a Gradientface as a preprocessing
step before LBP.
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13. GradientFace
ﻪIt is insensitive to variations in illumination
and stands out in face recognition applications.
ﻪGradientface Method:
1. Transforms to the gradient domain
2. Eliminate noise or shadow (Gaussian filter)
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14. ﻪSmooth the image through a convolution with a
Gaussian function
∗ is the convolution operator
σ is the Gaussian function
ﻪCompute the image gradient I convolving in
directions x, y
ﻪGenerate as result ,Gradientface
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18. [ ﻪGradientface + LBP ]
computational simplicity
robust to scales changes and illumination variations.
ﻪDefine the similarity between the LBP histograms of
each image a similarity distance is used [7].
[E. P. Xing, A. Y. Ng, M. I. Jordan, and S. Russell, “Distance metric learning with application to clustering with side
information,” in Advances in Neural Information Processing Systems 15 , S. Becker, S.Thrun, and K. Obermayer, Eds.
Cambridge, MA: MIT Press, 2003, pp. 505–512 ]
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20. Database
ﻪAR Face
ﻩMore than 4000 color images (70 men 56 women)
ﻩWith different facial expressions, lighting conditions
and occlusions (sun glasses and scarf)
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21. ﻪORL
04 ﻩsubjects, 10 different images for each subject.
ﻩFacial expressions (open or closed eyes)
ﻩFacial details (glasses and without glasses)
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26. Conclusion
ﻪAddress the problem of face recognition with
occlusion caused by sunglasses and scarf.
ﻪThe Gradientface applied to image with
illumination problem and used to pre-processing
the image, improved the recognition.
ﻪCombination of pre-processing techniques and
classifies can still demonstrate improvements in
face recognition problems.
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