70 lines
2.3 KiB
C++
70 lines
2.3 KiB
C++
#include <cmath>
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namespace {
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/*
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center
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V
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sequence
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0 1 2 ... int_diameter-1
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v v v ... v
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+---+---+---+---+---+---+---+---+---+---+---+---+---+---+---+
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|<------------------- int_diameter(pixel) ----------------->|
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|<--- int_radius(pixel) --->|
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|<------ real_radius ----->|
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|<- int_radius(pixel) ->|
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|<---- real_radius --->|
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|<-int_radius(pi) ->|
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|<- real_radius -->|
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|<-int_radius ->|
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|<- real_rad ->|
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|<- int ->|
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|<- real ->|
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|<- ->|
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|<- ->|
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|<->|
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|<>|
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*/
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void gauss_distribution_1d_(double *sequence,
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const int int_diameter /* sequence配列の長さ */
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,
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const int int_radius, const double real_radius,
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const double sigma /* = 0.25 : 適当な値... */
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) {
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/* メモリクリア */
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for (int ii = 0; ii < int_diameter; ++ii) {
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sequence[ii] = 0.0;
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}
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/* 半径がゼロでも計算を可能にする、強引に... */
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const int int_radius2 = (0 < int_radius) ? int_radius : 1;
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const double real_radius2 =
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(0. < real_radius) ? real_radius : 0.000000000000001;
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/* 1pixel以下の調整
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* -1.0の位置を(real_radius2)の位置とする */
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double dd = -1.0 * int_radius2 / real_radius2;
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/* 1pixel幅の差分 */
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const double delta = -dd / int_radius2;
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/* 開始位置 */
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const int start_pos = (int_diameter - (int_radius2 * 2 + 1)) / 2;
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/* 終了位置 */
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const int end_pos = int_diameter - start_pos;
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/* ガウス分布 */
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for (int ii = start_pos; ii < end_pos; ++ii) {
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sequence[ii] = exp(-(dd * dd) / (2.0 * sigma * sigma));
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dd += delta;
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}
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/* 積算 */
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dd = 0.0;
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for (int ii = start_pos; ii < end_pos; ++ii) {
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dd += sequence[ii];
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}
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/* 正規化(積算結果が1となるように割算する) */
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for (int ii = start_pos; ii < end_pos; ++ii) {
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sequence[ii] /= dd;
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}
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}
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}
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