Multilingual Text Detection with Nonlinear Neural Network

Algorithm 2

Stroke feature learning algorithm.

Input: input patches

Output: learning stroke features

Procedure:

(1) Normalize input

(2) ZAC whiten input

(3) Initialize , follow the steps in Algorithm 1

(4) Repeat

   Set for

   Set for all other

   Fix ,    and

   Until convergence or reach iteration limitation