00001
00002 /***************************************************************************
00003  *  min.cpp - implementation of min intensity filter
00004  *
00005  *  Created: Mon Jun 05 16:57:57 2006
00006  *  Copyright  2005-2007  Tim Niemueller [www.niemueller.de]
00007  *
00008  ****************************************************************************/
00009
00010 /*  This program is free software; you can redistribute it and/or modify
00011  *  it under the terms of the GNU General Public License as published by
00012  *  the Free Software Foundation; either version 2 of the License, or
00013  *  (at your option) any later version. A runtime exception applies to
00014  *  this software (see LICENSE.GPL_WRE file mentioned below for details).
00015  *
00016  *  This program is distributed in the hope that it will be useful,
00017  *  but WITHOUT ANY WARRANTY; without even the implied warranty of
00018  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
00019  *  GNU Library General Public License for more details.
00020  *
00021  *  Read the full text in the LICENSE.GPL_WRE file in the doc directory.
00022  */
00023
00024 #include <filters/min.h>
00025
00026 #include <core/exceptions/software.h>
00027 #include <fvutils/color/yuv.h>
00028 #include <cstddef>
00029
00030 using namespace fawkes;
00031 
00032 /** @class FilterMin <filters/min.h>
00033  * Minimum filter
00034  * @author Tim Niemueller
00035  */
00036 
00037 /** Constructor. */
00038 FilterMin::FilterMin()
00039   : Filter("FilterMin", 2)
00040 {
00041 }
00042
00043
00044 void
00045 FilterMin::apply()
00046 {
00047   if ( src[0] == NULL ) throw NullPointerException("FilterInvert: src buffer 0 is NULL");
00048   if ( src[1] == NULL ) throw NullPointerException("FilterInvert: src buffer 1 is NULL");
00049   if ( src_roi[0] == NULL ) throw NullPointerException("FilterInvert: src ROI 0 is NULL");
00050   if ( src_roi[1] == NULL ) throw NullPointerException("FilterInvert: src ROI 1 is NULL");
00051
00052   register unsigned int h = 0;
00053   register unsigned int w = 0;
00054
00055   // y-plane
00056   register unsigned char *byp   = src[0] + (src_roi[0]->start.y * src_roi[0]->line_step) + (src_roi[0]->start.x * src_roi[0]->pixel_step);
00057   // u-plane
00058   register unsigned char *bup   = YUV422_PLANAR_U_PLANE(src[0], src_roi[0]->image_width, src_roi[0]->image_height)
00059     + ((src_roi[0]->start.y * src_roi[0]->line_step) / 2 + (src_roi[0]->start.x * src_roi[0]->pixel_step) / 2) ;
00060   // v-plane
00061   register unsigned char *bvp   = YUV422_PLANAR_V_PLANE(src[0], src_roi[0]->image_width, src_roi[0]->image_height)
00062     + ((src_roi[0]->start.y * src_roi[0]->line_step) / 2 + (src_roi[0]->start.x * src_roi[0]->pixel_step) / 2);
00063
00064
00065   // y-plane
00066   register unsigned char *fyp   = src[1] + (src_roi[1]->start.y * src_roi[1]->line_step) + (src_roi[1]->start.x * src_roi[1]->pixel_step);
00067   // u-plane
00068   register unsigned char *fup   = YUV422_PLANAR_U_PLANE(src[1], src_roi[1]->image_width, src_roi[1]->image_height)
00069     + ((src_roi[1]->start.y * src_roi[1]->line_step) / 2 + (src_roi[1]->start.x * src_roi[1]->pixel_step) / 2) ;
00070   // v-plane
00071   register unsigned char *fvp   = YUV422_PLANAR_V_PLANE(src[1], src_roi[1]->image_width, src_roi[1]->image_height)
00072     + ((src_roi[1]->start.y * src_roi[1]->line_step) / 2 + (src_roi[1]->start.x * src_roi[1]->pixel_step) / 2);
00073
00074
00075   // destination y-plane
00076   register unsigned char *dyp  = dst + (dst_roi->start.y * dst_roi->line_step) + (dst_roi->start.x * dst_roi->pixel_step);
00077   // destination u-plane
00078   register unsigned char *dup   = YUV422_PLANAR_U_PLANE(dst, dst_roi->image_width, dst_roi->image_height)
00079     + ((dst_roi->start.y * dst_roi->line_step) / 2 + (dst_roi->start.x * dst_roi->pixel_step) / 2) ;
00080   // destination v-plane
00081   register unsigned char *dvp   = YUV422_PLANAR_V_PLANE(dst, dst_roi->image_width, dst_roi->image_height)
00082     + ((dst_roi->start.y * dst_roi->line_step) / 2 + (dst_roi->start.x * dst_roi->pixel_step) / 2);
00083
00084   // line starts
00085   unsigned char *lbyp = byp;   // y-plane
00086   unsigned char *lbup = fup;   // u-plane
00087   unsigned char *lbvp = fvp;   // v-plane
00088   unsigned char *lfyp = fyp;   // y-plane
00089   unsigned char *lfup = fup;   // u-plane
00090   unsigned char *lfvp = fvp;   // v-plane
00091   unsigned char *ldyp = dyp;  // destination y-plane
00092   unsigned char *ldup = dup;  // destination u-plane
00093   unsigned char *ldvp = dvp;  // destination v-plane
00094
00095   unsigned char u1, u2, v1, v2;
00096
00097   for (h = 0; (h < src_roi[1]->height) && (h < dst_roi->height); ++h) {
00098     for (w = 0; (w < src_roi[1]->width) && (w < dst_roi->width); w += 2) {
00099       if ( *byp < *fyp ) {
00100         *dyp++ = *byp;
00101         u1 = *bup;
00102         v1 = *bvp;
00103       } else {
00104         *dyp++ = *fyp;
00105         u1 = *fup;
00106         v1 = *fvp;
00107       }
00108       ++byp;
00109       ++fyp;
00110
00111       if ( *byp < *fyp ) {
00112         *dyp++ = *byp;
00113         u2 = *bup;
00114         v2 = *bvp;
00115       } else {
00116         *dyp++ = *fyp;
00117         u2 = *fup;
00118         v2 = *fvp;
00119       }
00120       ++byp;
00121       ++fyp;
00122
00123       *dup++ = (u1 + u2) / 2;
00124       *dvp++ = (v1 + v2) / 2;
00125
00126       ++bup;
00127       ++bvp;
00128       ++fup;
00129       ++fvp;
00130     }
00131
00132     lbyp   += src_roi[0]->line_step;
00133     lbup   += src_roi[0]->line_step / 2;
00134     lbvp   += src_roi[0]->line_step / 2;
00135     lfyp   += src_roi[1]->line_step;
00136     lfup   += src_roi[1]->line_step / 2;
00137     lfvp   += src_roi[1]->line_step / 2;
00138     ldyp  += dst_roi->line_step;
00139     ldup  += dst_roi->line_step / 2;
00140     ldvp  += dst_roi->line_step / 2;
00141     byp    = lbyp;
00142     bup    = lbup;
00143     bvp    = lbvp;
00144     fyp    = lfyp;
00145     fup    = lfup;
00146     fvp    = lfvp;
00147     dyp    = ldyp;
00148     dup    = ldup;
00149     dvp    = ldvp;
00150   }
00151
00152 }