tags/2.4.2/src/jp/nyatla/nyartoolkit/core/rasterfilter/rgb2gs/NyARRasterFilter_Rgb2Gs_YCbCr.java

   1 /* \r
   2  * PROJECT: NyARToolkit(Extension)\r
   3  * --------------------------------------------------------------------------------\r
   4  * The NyARToolkit is Java edition ARToolKit class library.\r
   5  * Copyright (C)2008-2009 Ryo Iizuka\r
   6  *\r
   7  * This program is free software: you can redistribute it and/or modify\r
   8  * it under the terms of the GNU General Public License as published by\r
   9  * the Free Software Foundation, either version 3 of the License, or\r
  10  * (at your option) any later version.\r
  11  * \r
  12  * This program is distributed in the hope that it will be useful,\r
  13  * but WITHOUT ANY WARRANTY; without even the implied warranty of\r
  14  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the\r
  15  * GNU General Public License for more details.\r
  16  *\r
  17  * You should have received a copy of the GNU General Public License\r
  18  * along with this program.  If not, see <http://www.gnu.org/licenses/>.\r
  19  * \r
  20  * For further information please contact.\r
  21  *      http://nyatla.jp/nyatoolkit/\r
  22  *      <airmail(at)ebony.plala.or.jp> or <nyatla(at)nyatla.jp>\r
  23  * \r
  24  */\r
  25 package jp.nyatla.nyartoolkit.core.rasterfilter.rgb2gs;\r
  26 \r
  27 import jp.nyatla.nyartoolkit.NyARException;\r
  28 import jp.nyatla.nyartoolkit.core.raster.NyARGrayscaleRaster;\r
  29 import jp.nyatla.nyartoolkit.core.raster.rgb.INyARRgbRaster;\r
  30 import jp.nyatla.nyartoolkit.core.rasterfilter.rgb2gs.INyARRasterFilter_RgbToGs;\r
  31 import jp.nyatla.nyartoolkit.core.rasterreader.INyARBufferReader;\r
  32 import jp.nyatla.nyartoolkit.core.types.NyARIntSize;\r
  33 \r
  34 /**\r
  35  * YCbCr変換して、Y成分のグレースケールの値を計算します。\r
  36  * 変換式は、http://www.tyre.gotdns.org/を参考にしました。\r
  37  */\r
  38 public class NyARRasterFilter_Rgb2Gs_YCbCr implements INyARRasterFilter_RgbToGs\r
  39 {\r
  40         private IdoFilterImpl _dofilterimpl;\r
  41         public NyARRasterFilter_Rgb2Gs_YCbCr(int i_raster_type) throws NyARException\r
  42         {\r
  43                 switch (i_raster_type) {\r
  44                 case INyARBufferReader.BUFFERFORMAT_BYTE1D_B8G8R8_24:\r
  45                         this._dofilterimpl=new IdoFilterImpl_BYTE1D_B8G8R8_24();\r
  46                         break;\r
  47                 case INyARBufferReader.BUFFERFORMAT_BYTE1D_R8G8B8_24:\r
  48                 default:\r
  49                         throw new NyARException();\r
  50                 }\r
  51         }\r
  52         public void doFilter(INyARRgbRaster i_input, NyARGrayscaleRaster i_output) throws NyARException\r
  53         {\r
  54                 assert (i_input.getSize().isEqualSize(i_output.getSize()) == true);\r
  55                 this._dofilterimpl.doFilter(i_input.getBufferReader(),i_output.getBufferReader(),i_input.getSize());\r
  56         }\r
  57         \r
  58         interface IdoFilterImpl\r
  59         {\r
  60                 public void doFilter(INyARBufferReader i_input, INyARBufferReader i_output,NyARIntSize i_size) throws NyARException;\r
  61         }\r
  62         class IdoFilterImpl_BYTE1D_B8G8R8_24 implements IdoFilterImpl\r
  63         {\r
  64                 /**\r
  65                  * This function is not optimized.\r
  66                  */\r
  67                 public void doFilter(INyARBufferReader i_input, INyARBufferReader i_output,NyARIntSize i_size) throws NyARException\r
  68                 {\r
  69                         assert(         i_input.isEqualBufferType(INyARBufferReader.BUFFERFORMAT_BYTE1D_B8G8R8_24));\r
  70                         \r
  71                         int[] out_buf = (int[]) i_output.getBuffer();\r
  72                         byte[] in_buf = (byte[]) i_input.getBuffer();\r
  73 \r
  74                         int bp = 0;\r
  75                         for (int y = 0; y < i_size.h; y++){\r
  76                                 for (int x = 0; x < i_size.w; x++){\r
  77                                         out_buf[y*i_size.w+x]=(306*(in_buf[bp+2] & 0xff)+601*(in_buf[bp + 1] & 0xff)+117 * (in_buf[bp + 0] & 0xff))>>10;\r
  78                                         bp += 3;\r
  79                                 }\r
  80                         }\r
  81                         return;\r
  82                 }\r
  83         }       \r
  84 }