Making mosaic images with ffmpeg
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#pragma once
#include <cmath>
namespace wvlt {
// first row of the matrix Wn
static double const evn_coef[] = {
(1.0 + std::sqrt(3.0))/(std::sqrt(32.0)),
(3.0 + std::sqrt(3.0))/(std::sqrt(32.0)),
(3.0 - std::sqrt(3.0))/(std::sqrt(32.0)),
(1.0 - std::sqrt(3.0))/(std::sqrt(32.0))
};
// second row of the matrix Wn
static double const odd_coef[] = {
evn_coef[3],
-evn_coef[2],
evn_coef[1],
-evn_coef[0]
};
// first (shifted) row of the matrix Wn^-1
static double const evn_coef_inv[] = {
evn_coef[2],
evn_coef[1],
evn_coef[0],
evn_coef[3]
};
// second (shifted) row of the matrix Wn^-1
static double const odd_coef_inv[] = {
evn_coef[3],
-evn_coef[0],
evn_coef[1],
-evn_coef[2]
};
}