trunk/sample/sandbox/jp/nyatla/nyartoolkit/core/rasterfilter/rgb2gs/NyARRasterFilter_Rgb2Gs_CbCrCut.java

   1 package jp.nyatla.nyartoolkit.core.rasterfilter.rgb2gs;\r
   2 \r
   3 import jp.nyatla.nyartoolkit.NyARException;\r
   4 import jp.nyatla.nyartoolkit.core.raster.*;\r
   5 import jp.nyatla.nyartoolkit.core.raster.rgb.INyARRgbRaster;\r
   6 import jp.nyatla.nyartoolkit.core.types.NyARIntSize;\r
   7 \r
   8 /**\r
   9  * YCbCr変換したY成分を、RGBカラーベクトルの差が少いほど強度が落ちるようにしてグレースケールに変換します。\r
  10  * sには減衰度数を設定します。\r
  11  * 強度計算は以下のように行います。\r
  12  * f(x):=exp(-x^2/s^2)  窓関数\r
  13  * p :=Y*f(cr)*f(cb)\r
  14  */\r
  15 public class NyARRasterFilter_Rgb2Gs_CbCrCut implements INyARRasterFilter_Rgb2Gs\r
  16 {\r
  17         private IdoFilterImpl _dofilterimpl;\r
  18         /**\r
  19          * 1024倍した値\r
  20          */\r
  21         private int _window[]=new int[256];\r
  22         public NyARRasterFilter_Rgb2Gs_CbCrCut(int i_raster_type,double i_sigma) throws NyARException\r
  23         {\r
  24                 switch (i_raster_type) {\r
  25                 case NyARBufferType.BYTE1D_B8G8R8_24:\r
  26                         this._dofilterimpl=new IdoFilterImpl_BYTE1D_B8G8R8_24();\r
  27                         break;\r
  28                 case NyARBufferType.BYTE1D_R8G8B8_24:\r
  29                 default:\r
  30                         throw new NyARException();\r
  31                 }\r
  32                 this._dofilterimpl._window_ref=this._window;\r
  33                 //windowの作成\r
  34                 for(int i=0;i<256;i++){\r
  35                         double p=((double)i-127.0)/127.0;\r
  36                         this._window[i]=(int)(1024*Math.exp(-p*p/(i_sigma*i_sigma)));\r
  37                 }\r
  38         }\r
  39         public void doFilter(INyARRgbRaster i_input, NyARGrayscaleRaster i_output) throws NyARException\r
  40         {\r
  41                 assert (i_input.getSize().isEqualSize(i_output.getSize()) == true);\r
  42                 this._dofilterimpl.doFilter(i_input,i_output,i_input.getSize());\r
  43         }\r
  44         \r
  45         abstract class IdoFilterImpl\r
  46         {\r
  47                 int[] _window_ref;\r
  48                 public abstract void doFilter(INyARRaster i_input, INyARRaster i_output,NyARIntSize i_size) throws NyARException;\r
  49                 \r
  50         }\r
  51         class IdoFilterImpl_BYTE1D_B8G8R8_24 extends IdoFilterImpl\r
  52         {\r
  53                 public void doFilter(INyARRaster i_input, INyARRaster i_output,NyARIntSize i_size) throws NyARException\r
  54                 {\r
  55                         assert( i_input.isEqualBufferType(NyARBufferType.BYTE1D_B8G8R8_24));\r
  56                         assert( i_output.isEqualBufferType(NyARBufferType.INT1D_GRAY_8));\r
  57                         \r
  58                         int[] out_buf = (int[]) i_output.getBuffer();\r
  59                         byte[] in_buf = (byte[]) i_input.getBuffer();\r
  60                         \r
  61                         int r,g,b;\r
  62                         int[] win=this._window_ref;\r
  63 \r
  64                         int bp = 0;\r
  65                         for (int y = 0; y < i_size.h; y++){\r
  66                                 for (int x = 0; x < i_size.w; x++){\r
  67                                         b=(in_buf[bp] & 0xff);\r
  68                                         g=(in_buf[bp + 1] & 0xff);\r
  69                                         r=(in_buf[bp + 2] & 0xff);\r
  70                                         bp += 3;\r
  71                                         int yv=(306*r+601*g+117 * b)>>10;//0<yv<255\r
  72                                         int cr=(((-173 * r-339 * g + 512 *b))>>10)+127;//-127.5<=0<=127.5\r
  73                                         int cb=((( 512 * r-429 * g -  83 *b))>>10)+127;//-127.5<=0<=127.5\r
  74                                         out_buf[y*i_size.w+x]=(yv*(int)win[cr]*win[cb])>>20;\r
  75                                 }\r
  76                         }\r
  77                         return;\r
  78                 }\r
  79         }       \r
  80 }