Lines Matching refs:sigma
380 double vp8_gaussian(double sigma, double mu, double x)
382 return 1 / (sigma * sqrt(2.0 * 3.14159265)) *
383 (exp(-(x - mu) * (x - mu) / (2 * sigma * sigma)));
393 double sigma;
399 sigma = ai + .5 + .6 * (63 - qi) / 63.0;
402 * a gaussian distribution with sigma determined by q.
412 int a = (int)(.5 + 256 * vp8_gaussian(sigma, 0, i));
