http:/parnec.nuaa.edu.cn Handwritten digit recognition aided by meta-features Define features and meta-features (um, uy) Figure 3: Features used in the experiments. Each fea ture is a monomial, multiplying the gray level of two or three pixels. The input pixels of a monomial form an isosceles triangle with its height equal to a quarter of its base(for two inputs, the middle input is omit ted). Each feature is described by five meta-features 6, u2,uy). ut is the number of inputs(2 or 3) ar is the distance between the two pixels at the base of the triangle. ug is the orientation of the base. (ur, uy) is the position of the feature in the 28 x 28 image same height for all isosceles triangleCompany name www.themegallery.com Handwritten digit recognition aided by meta-features Define features and meta-features same height for all isosceles triangle