Fig. 6From: A study on different experimental configurations for age, race, and gender estimation problemsWLD histogram construction process: the algorithm computes the DE and OR values for each pixel and constructs the 2-D histogram. The 2-D histogram is split into a M×T matrix, where each element is an histogram of S bins. Finally, the whole 1-D histogram is composed by the concatenation of the previous matrix rowsBack to article page