Research Article

Comparative Study of Human Age Estimation with or without Preclassification of Gender and Facial Expression

Table 4

The number of images used for the comparative experiments with/without the preclassification of facial expression.

DatabaseNumber of learning imagesNumber of testing images

Facial expression database
 Annoyed2119
 Happy130128
 Neutral291289
 Sad3232
 Surprised3938
 Total513506
Whole
PAL database
523522