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Three-dimensional Face Shape by Local Features Prediction
Ruben Garcia-Zurdo
Pages - 1 - 10     |    Revised - 31-12-2014     |    Published - 31-1-2015
Volume - 9   Issue - 1    |    Publication Date - January / February 2015  Table of Contents
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KEYWORDS
Shape from Shading, Three-dimensional Face Shape, Eigenfeatures, Multivariate Regression.
ABSTRACT
A method is presented to estimate the 3D face shape from a frontal image using a multivariate linear regression model between intensity and depth features: block based discrete cosine transform (DCT), block based principal component analysis (PCA) and modular PCA (eigenfeatures) coefficients. After noting that between-illumination coefficients variances are smaller than between-subjects coefficients variances, we try to correct illumination variations by discarding the first coefficient in the DCT method but not in the PCA methods, as the between-illumination coefficients variances are distributed over many of them. The lowest fractional error in depth prediction is obtained by using a low number of coefficients and a high overlap degree between blocks. Modular PCA produces the best results when the test image is frontally illuminated as in the training phase. DCT and local PCA are more robust across point source horizontal angle and ambient illumination variations.
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Mr. Ruben Garcia-Zurdo
Colegio Universitario "Cardenal Cisneros" - Spain
rubengarcia@cu-cisneros.es