00001 /*
00002  *  MPGridScan.h
00003  *  
00004  *
00005  *  Created by Josh Susskind 2003.
00006  *  Copyright (c) 2003 Machine Perception Laboratory
00007  *  University of California San Diego.
00008  *  Please read the disclaimer and notes about redistribution
00009  *  at the end of this file.
00010  *
00011  *  Authors: Josh Susskind
00012  */
00013 #ifndef __MPGRIDSCAN_H__
00014 #define __MPGRIDSCAN_H__
00015 
00016 #include "preprocessor.h"
00017 
00018 /* ================================================================ */
00019 
00020 //template<class T, int DOWNSAMPLE> 
00021 class MPGridScan {
00022 private:
00023         int m_downsample;
00024         int m_gridScanX;
00025         int m_gridScanY;
00026         int m_maxSamplePoints;
00027         int m_scanX;
00028         int m_scanY;
00029         int m_scanLength;
00030         int m_scanHeight;
00031         int m_imgWidth;
00032         int m_imgHeight;
00033         double m_dh;
00034         double m_dw;
00035 
00036 public:
00037         MPGridScan() {
00038                 m_downsample = 1;//DOWNSAMPLE;
00039                 m_scanX = 0;
00040                 m_scanY = 0;
00041         }
00042 
00043         inline void UpdateVars(const int & imgWidth, const int & imgHeight, const int & downsample) {
00044                 m_downsample = downsample;
00045                 m_imgWidth = imgWidth;
00046                 m_imgHeight = imgHeight;
00047                 m_gridScanX = m_imgWidth / m_downsample;
00048                 m_gridScanY = m_imgHeight / m_downsample;
00049                 m_maxSamplePoints = m_gridScanX*m_gridScanY;
00050                 m_scanLength = m_imgWidth;
00051                 m_scanHeight = m_imgHeight;
00052                 m_dh = m_downsample; // (double) m_scanHeight/m_gridScanY;
00053                 m_dw = m_downsample; // (double) m_scanLength/m_gridScanX;
00054         }
00055 
00056         inline int get_gridScanX() {
00057                 return m_gridScanX;
00058         }
00059 
00060         inline int get_gridScanY() {
00061                 return m_gridScanY;
00062         }
00063 
00064         inline int next(int &gridX, int &gridY, int &incr) {
00065                 static int iPixel = 0;
00066                 if (iPixel == m_maxSamplePoints) {
00067                         iPixel = 0;
00068                         return (0);
00069                 }
00070                 static const float oneoverdiv = 1.0/m_gridScanX;
00071                 gridY = (int)( iPixel * oneoverdiv );
00072                 gridX = (int)( iPixel % m_gridScanX );
00073                 int yCoord = m_scanY + m_dh*gridY;
00074                 int xCoord = m_scanX + m_dw*gridX;
00075                 incr = m_imgWidth * yCoord + xCoord;
00076                 iPixel++;
00077                 return (1);
00078         }
00079 };
00080 
00081 /* ================================================================ */
00082 
00083 #endif __MPGRIDSCAN_H__
00084 
00085 
00086 /*
00087  * 
00088  * Redistribution and use in source and binary forms, with or without modification, are permitted provided that the following conditions are met:
00089  * 
00090  *    1. Redistributions of source code must retain the above copyright notice, this list of conditions and the following disclaimer.
00091  *    2. Redistributions in binary form must reproduce the above copyright notice, this list of conditions and the following disclaimer in the documentation and/or other materials provided with the distribution.
00092  *    3. The name of the author may not be used to endorse or promote products derived from this software without specific prior written permission.
00093  * 
00094  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
00095  * 
00096  */