Journal
IEEE TRANSACTIONS ON IMAGE PROCESSING
Volume 24, Issue 6, Pages 1735-1747Publisher
IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
DOI: 10.1109/TIP.2015.2409988
Keywords
Face recognition; multiple scales; difference edgemaps; uncontrolled lighting conditions
Funding
- National Science Foundation of China [61203248, 11171354, 90920007, 61375033, 61403164]
- Ministry of Education, China [SRFDP-20120171120007, 20120171110016]
- Natural Science Foundation of Guangdong Province [S2013020012796]
- Fundamental Research Funds for the Central Universities [13lgpy26]
- National Laboratory of Pattern Recognition
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Lambertian model is a classical illumination model consisting of a surface albedo component and a light intensity component. Some previous researches assume that the light intensity component mainly lies in the large-scale features. They adopt holistic image decompositions to separate it out, but it is difficult to decide the separating point between large-scale and small-scale features. In this paper, we propose to take a logarithm transform, which can change the multiplication of surface albedo and light intensity into an additive model. Then, a difference (substraction) between two pixels in a neighborhood can eliminate most of the light intensity component. By dividing a neighborhood into subregions, edgemaps of multiple scales can be obtained. Then, each edgemap is multiplied by a weight that can be determined by an independent training scheme. Finally, all the weighted edgemaps are combined to form a robust holistic feature map. Extensive experiments on four benchmark data sets in controlled and uncontrolled lighting conditions show that the proposed method has promising results, especially in uncontrolled lighting conditions, even mixed with other complicated variations.
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