/* 
 * PROJECT: NyARToolkitAS3
 * --------------------------------------------------------------------------------
 * This work is based on the original ARToolKit developed by
 *   Hirokazu Kato
 *   Mark Billinghurst
 *   HITLab, University of Washington, Seattle
 * http://www.hitl.washington.edu/artoolkit/
 *
 * The NyARToolkitAS3 is AS3 edition ARToolKit class library.
 * Copyright (C)2010 Ryo Iizuka
 *
 * This program is free software: you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 * 
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program.  If not, see <http://www.gnu.org/licenses/>.
 * 
 * For further information please contact.
 *	http://nyatla.jp/nyatoolkit/
 *	<airmail(at)ebony.plala.or.jp> or <nyatla(at)nyatla.jp>
 * 
 */
package jp.nyatla.nyartoolkit.as3.core.match 
{
	import jp.nyatla.nyartoolkit.as3.core.raster.*;
	
	public class NyARMatchPattDeviationBlackWhiteData
	{
		private var _data:Vector.<int>;
		private var _pow:Number;
		//
		private var _number_of_pixels:int;
		public function refData():Vector.<int>
		{
			return this._data;
		}
		public function getPow():Number
		{
			return this._pow;
		}
						  
		public function NyARMatchPattDeviationBlackWhiteData(i_width:int,i_height:int)
		{
			this._number_of_pixels=i_height*i_width;
			this._data=new Vector.<int>(this._number_of_pixels);
			return;
		}
		/**
		 * XRGB[width*height]の配列から、パターンデータを構築。
		 * @param i_buffer
		 */
		public function setRaster(i_raster:INyARRaster):void
		{
			//i_buffer[XRGB]→差分[BW]変換			
			var i:int;
			var ave:int;//<PV/>
			var rgb:int;//<PV/>
			var linput:Vector.<int>=this._data;//<PV/>
			var buf:Vector.<int>=Vector.<int>(i_raster.getBuffer());

			// input配列のサイズとwhも更新// input=new int[height][width][3];
			var number_of_pixels:int=this._number_of_pixels;

			//<平均値計算(FORの1/8展開)/>
			ave = 0;
			for(i=number_of_pixels-1;i>=0;i--){
				rgb = buf[i];
				ave += ((rgb >> 16) & 0xff) + ((rgb >> 8) & 0xff) + (rgb & 0xff);
			}
			ave=(number_of_pixels*255*3-ave)/(3*number_of_pixels);
			//
			var sum:int = 0,w_sum:int;
			
			//<差分値計算/>
			for (i = number_of_pixels-1; i >= 0;i--) {
				rgb = buf[i];
				w_sum =((255*3-(rgb & 0xff)-((rgb >> 8) & 0xff)-((rgb >> 16) & 0xff))/3)-ave;
				linput[i] = w_sum;
				sum += w_sum * w_sum;
			}
			var p:Number=Math.sqrt(Number(sum));
			this._pow=p!=0.0?p:0.0000001;
			return;
		}
	}

}