Figure 4
![Figure 4](http://media.springernature.com/full/springer-static/image/art%3A10.1186%2F1687-6180-2011-82/MediaObjects/13634_2011_Article_80_Fig4_HTML.jpg)
Results on FERET data set for (I) PCA and (II) ERE experiments: (a) EER and ROC performances of EW + DBR, EW + BRGC and EW + LSSC discretizations; and the rescaled L1 distance-based classification; and (b) the performance resemblances of applying EW + LSSC. (C) and (H) denote the performance evaluation in the continuous and the Hamming domains respectively. Classification performance evaluated in the continuous domain is irrespective to the entropy. '[α]' associated with each reading in the EER plots indicates the corresponding length α of the extracted binary strings.