Face image enhancement taking into account lighting behavior on a face

Authors:
Masato Tsukada;Chisato Funayama;Masatoshi Arai;Charles Dubout
Affiliations:
Information and Media Processing Laboratories, NEC Coproration, Kawasaki, Japan;Information and Media Processing Laboratories, NEC Coproration, Kawasaki, Japan;Advanced Technology Solution Division, NEC Informatic Systems, Ltd., Kawasaki, Japan;Idiap Research Institute, Martigny, Switzerland
Venue:
CAIP'11 Proceedings of the 14th international conference on Computer analysis of images and patterns - Volume Part II
Year:
2011

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Abstract

This paper presents a face image enhancement taking into account lighting behavior with a low computational cost. We already proposed the enhancement method using a 3D face model. It is however difficult to implement it in color imaging appliances due to the high computational cost. The newly proposed method decomposes color information of a face into three components, i.e., specularites, shadows and albedo by using a light reflection model. Spectral reflectance is recovered from the albedo, and improved by bringing it close to a predefined reference. By modifying only the reflectance, the synthesized images appear naturally enhanced, maintaining the original expression of human faces that is influenced by specularities and shadows. The proposed method reduces its processing time to one seventy-fifth of that of the method using a 3D face model. Experiments demonstrate that the proposed method is effective for imaging appliances in terms of computational cost and image quality.