tags/2.4.2/src/jp/nyatla/nyartoolkit/core/analyzer/histgram/NyARHistgramAnalyzer_SlidePTile.java

   1 package jp.nyatla.nyartoolkit.core.analyzer.histgram;\r
   2 \r
   3 import jp.nyatla.nyartoolkit.core.types.NyARHistgram;\r
   4 \r
   5 \r
   6 \r
   7 /**\r
   8  * 明点と暗点を双方向からPタイル法でカウントして、その中央値を閾値とする。\r
   9  * \r
  10  * \r
  11  */\r
  12 public class NyARHistgramAnalyzer_SlidePTile implements INyARHistgramAnalyzer_Threshold\r
  13 {\r
  14         private int _persentage;\r
  15         public NyARHistgramAnalyzer_SlidePTile(int i_persentage)\r
  16         {\r
  17                 assert (0 <= i_persentage && i_persentage <= 50);\r
  18                 //初期化\r
  19                 this._persentage=i_persentage;\r
  20         }       \r
  21         public int getThreshold(NyARHistgram i_histgram)\r
  22         {\r
  23                 //総ピクセル数を計算\r
  24                 int n=i_histgram.length;\r
  25                 int sum_of_pixel=i_histgram.total_of_data;\r
  26                 int[] hist=i_histgram.data;\r
  27                 // 閾値ピクセル数確定\r
  28                 final int th_pixcels = sum_of_pixel * this._persentage / 100;\r
  29                 int th_wk;\r
  30                 int th_w, th_b;\r
  31 \r
  32                 // 黒点基準\r
  33                 th_wk = th_pixcels;\r
  34                 for (th_b = 0; th_b < n-2; th_b++) {\r
  35                         th_wk -= hist[th_b];\r
  36                         if (th_wk <= 0) {\r
  37                                 break;\r
  38                         }\r
  39                 }\r
  40                 // 白点基準\r
  41                 th_wk = th_pixcels;\r
  42                 for (th_w = n-1; th_w > 1; th_w--) {\r
  43                         th_wk -= hist[th_w];\r
  44                         if (th_wk <= 0) {\r
  45                                 break;\r
  46                         }\r
  47                 }\r
  48                 // 閾値の保存\r
  49                 return (th_w + th_b) / 2;\r
  50         }\r
  51 }\r