168 lines
4.1 KiB
C
168 lines
4.1 KiB
C
/* @(#) Recombination of bands of image: perform a matrix mult of the form
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* @(#)
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* @(#) a1 b11 b21 .. bm1 c1
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* @(#) a2 b12 b22 .. c2
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* @(#) . = . . x .
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* @(#) . . .
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* @(#)
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* @(#) an b1n bmn cm
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* @(#)
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* @(#) Where A is an n band output image, C is an m band input image and B
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* @(#) is an mxn matrix of floats. Can be used with 3x3 matrix to perform
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* @(#) simple colour space transforms; 7x30 matrix to shrink 3rd order
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* @(#) development of 3 filter system to IM_TYPE_XYZ etc.
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* @(#)
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* @(#) Output is always float, unless input is double, in which case output
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* @(#) is double. Does not work for complex images.
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* @(#)
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* @(#) Usage:
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* @(#) im_recomb( imagein, imageout, mat )
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* @(#) IMAGE *imagein, *imageout;
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* @(#) DOUBLEMASK *mat;
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* @(#)
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* @(#) Returns: -1 on error, else 0
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* 21/6/95 JC
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* - mildly modernised
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* 14/3/96 JC
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* - better error checks, partial
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* - proper rounding behaviour for int types
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*/
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/*
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This file is part of VIPS.
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VIPS is free software; you can redistribute it and/or modify
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it under the terms of the GNU Lesser General Public License as published by
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the Free Software Foundation; either version 2 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public License
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along with this program; if not, write to the Free Software
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Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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*/
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/*
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These files are distributed with VIPS - http://www.vips.ecs.soton.ac.uk
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*/
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#ifdef HAVE_CONFIG_H
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#include <config.h>
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#endif /*HAVE_CONFIG_H*/
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#include <vips/intl.h>
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#include <stdio.h>
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#include <vips/vips.h>
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#ifdef WITH_DMALLOC
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#include <dmalloc.h>
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#endif /*WITH_DMALLOC*/
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/* Inner loop.
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*/
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#define LOOP(INTYPE, OUTTYPE) \
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{\
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INTYPE *p = (INTYPE *) bin;\
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OUTTYPE *q = (OUTTYPE *) bout;\
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\
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for( i = 0; i < width; i++ ) {\
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double *m = mat->coeff;\
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\
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for( v = 0; v < mat->ysize; v++ ) {\
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double t = 0.0;\
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\
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for( u = 0; u < mat->xsize; u++ )\
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t += *m++ * p[u];\
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\
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*q++ = (OUTTYPE) t;\
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}\
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\
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p += mat->xsize;\
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}\
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}
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/* Process a buffer of PELs.
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*/
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static int
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recomb_buf( void *bin, void *bout, int width, IMAGE *in, DOUBLEMASK *mat )
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{
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int i;
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int u, v;
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/* Do the processing.
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*/
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switch( in->BandFmt ) {
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case IM_BANDFMT_UCHAR: LOOP( unsigned char, float ); break;
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case IM_BANDFMT_CHAR: LOOP( signed char, float ); break;
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case IM_BANDFMT_USHORT: LOOP( unsigned short, float ); break;
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case IM_BANDFMT_SHORT: LOOP( signed short, float ); break;
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case IM_BANDFMT_UINT: LOOP( unsigned int, float ); break;
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case IM_BANDFMT_INT: LOOP( signed int, float ); break;
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case IM_BANDFMT_FLOAT: LOOP( float, float ); break;
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case IM_BANDFMT_DOUBLE: LOOP( double, double ); break;
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default:
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im_errormsg( "im_recomb: unsupported input type" );
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return( -1 );
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}
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return( 0 );
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}
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/* Start here.
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*/
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int
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im_recomb( IMAGE *in, IMAGE *out, DOUBLEMASK *mat )
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{
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DOUBLEMASK *mcpy;
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/* Check input image.
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*/
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if( im_piocheck( in, out ) )
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return( -1 );
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if( in->Coding != IM_CODING_NONE || im_iscomplex( in ) ) {
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im_errormsg( "im_recomb: uncoded non-complex only" );
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return( -1 );
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}
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if( in->Bands != mat->xsize ) {
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im_errormsg( "im_recomb: bands in must equal matrix width" );
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return( -1 );
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}
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/* Prepare the output image
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*/
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if( im_cp_desc( out, in ) )
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return( -1 );
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out->Bands = mat->ysize;
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if( im_isint( in ) ) {
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out->Bbits = IM_BBITS_FLOAT;
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out->BandFmt = IM_BANDFMT_FLOAT;
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}
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/* Take a copy of the matrix.
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*/
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if( !(mcpy = im_dup_dmask( mat, "conv_mask" )) )
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return( -1 );
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if( im_add_close_callback( out,
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(im_callback_fn) im_free_dmask, mcpy, NULL ) ) {
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im_free_dmask( mcpy );
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return( -1 );
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}
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/* And process!
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*/
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if( im_wrapone( in, out, (im_wrapone_fn) recomb_buf, in, mcpy ) )
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return( -1 );
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return( 0 );
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}
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