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Face Recognition with Preprocessing and Neural Networks
Linköping University, Department of Electrical Engineering, Computer Vision. Linköping University, Faculty of Science & Engineering.
2016 (English)Independent thesis Advanced level (degree of Master (Two Years)), 20 credits / 30 HE creditsStudent thesis
Abstract [en]

Face recognition is the problem of identifying individuals in images. This thesis evaluates two methods used to determine if pairs of face images belong to the same individual or not. The first method is a combination of principal component analysis and a neural network and the second method is based on state-of-the-art convolutional neural networks. They are trained and evaluated using two different data sets. The first set contains many images with large variations in, for example, illumination and facial expression. The second consists of fewer images with small variations.

Principal component analysis allowed the use of smaller networks. The largest network has 1.7 million parameters compared to the 7 million used in the convolutional network. The use of smaller networks lowered the training time and evaluation time significantly. Principal component analysis proved to be well suited for the data set with small variations outperforming the convolutional network which need larger data sets to avoid overfitting. The reduction in data dimensionality, however, led to difficulties classifying the data set with large variations. The generous amount of images in this set allowed the convolutional method to reach higher accuracies than the principal component method.

Place, publisher, year, edition, pages
2016. , 35 p.
Keyword [en]
CNN, neural network, convolutional neural network, face recognition, preprocessing, eigenfaces
National Category
Signal Processing
URN: urn:nbn:se:liu:diva-128704ISRN: LiTH-ISY-EX--16/4953--SEOAI: diva2:931705
External cooperation
Combitech AB
Subject / course
Computer Vision Laboratory
Available from: 2016-05-31 Created: 2016-05-30 Last updated: 2016-05-31Bibliographically approved

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Habrman, David
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Computer VisionFaculty of Science & Engineering
Signal Processing

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