Lines Matching full:sigma
68 // g(x) = ( 1 / sqrt( 2 * pi ) * sigma) * e ^ ( -x^2 / 2 * sigma^2 )
70 // and sigma varies with radius.
71 // Based on some experimental radius values and sigma's
72 // we approximately fit sigma = f(radius) as
73 // sigma = radius * 0.4 + 0.6
75 // will resemble a box blur since with large sigma
77 float sigma = 0.4f * mRadius + 0.6f;
81 float coeff1 = 1.0f / (sqrtf(2.0f * pi) * sigma);
82 float coeff2 = - 1.0f / (2.0f * sigma * sigma);
