| /* @(#) test pattern with increasing spatial frequence in X and amplitude in Y |
| * @(#) factor should be between 0 and 1 and determines the spatial frequencies |
| * @(#) Creates an one band float image |
| * @(#) Image has values between +ysize*ysize and -ysize*ysize |
| * @(#) |
| * @(#) int im_eye(image, xsize, ysize, factor) |
| * @(#) IMAGE *image; |
| * @(#) int xsize, ysize; |
| * @(#) double factor; |
| * @(#) |
| * @(#) Returns -1 on error and 0 on success |
| * |
| * Copyright: 1990, 1991, N.Dessipris. |
| * |
| * Author N. Dessipris |
| * Written on 30/05/1990 |
| * Updated on: 27/01/1991, 07/03/1991, |
| * 22/7/93 JC |
| * - im_outcheck() added |
| * 30/8/95 JC |
| * - modernized |
| */ |
| |
| /* |
| |
| This file is part of VIPS. |
| |
| VIPS is free software; you can redistribute it and/or modify |
| it under the terms of the GNU Lesser General Public License as published by |
| the Free Software Foundation; either version 2 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 Lesser General Public License for more details. |
| |
| You should have received a copy of the GNU Lesser General Public License |
| along with this program; if not, write to the Free Software |
| Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA |
| |
| */ |
| |
| /* |
| |
| These files are distributed with VIPS - http://www.vips.ecs.soton.ac.uk |
| |
| */ |
| |
| #ifdef HAVE_CONFIG_H |
| #include <config.h> |
| #endif /*HAVE_CONFIG_H*/ |
| #include <vips/intl.h> |
| |
| #include <stdio.h> |
| #include <stdlib.h> |
| #include <math.h> |
| |
| #include <vips/vips.h> |
| |
| #ifdef WITH_DMALLOC |
| #include <dmalloc.h> |
| #endif /*WITH_DMALLOC*/ |
| |
| int |
| im_feye( IMAGE *image, const int xsize, const int ysize, const double factor ) |
| { |
| int x, y; |
| double constant; |
| double *lut; |
| float *line; |
| |
| /* Check input args |
| */ |
| if( im_outcheck( image ) ) |
| return( -1 ); |
| if( factor > 1.0 || factor <= 0.0 ) { |
| im_error( "im_feye", "%s", _( "factor should be in [1,0)" ) ); |
| return( -1 ); |
| } |
| |
| /* Set image descriptor |
| */ |
| im_initdesc( image, xsize, ysize, 1, IM_BBITS_FLOAT, IM_BANDFMT_FLOAT, |
| IM_CODING_NONE, IM_TYPE_B_W, 1.0, 1.0, 0, 0 ); |
| if( im_setupout( image ) ) |
| return( -1 ); |
| |
| /* Allocate space for line buffer. |
| */ |
| if( !(line = IM_ARRAY( image, xsize, float )) ) |
| return( -1 ); |
| |
| /* Make a lut for easy calculations. |
| */ |
| if( !(lut = IM_ARRAY( image, image->Xsize, double )) ) |
| return( -1 ); |
| constant = factor * IM_PI/(2*(xsize - 1)); |
| for( x = 0; x < image->Xsize; x++ ) |
| lut[x] = cos( constant*x*x ) / ((ysize - 1)*(ysize - 1)); |
| |
| /* Make image. |
| */ |
| for( y = 0; y < image->Ysize; y++ ) { |
| for( x = 0; x < image->Xsize; x++ ) |
| line[x] = y*y*lut[x]; |
| if( im_writeline( y, image, (PEL *) line ) ) |
| return( -1 ); |
| } |
| |
| return( 0 ); |
| } |
| |
| /* As above, but make a IM_BANDFMT_UCHAR image. |
| */ |
| int |
| im_eye( IMAGE *image, const int xsize, const int ysize, const double factor ) |
| { |
| IMAGE *t1 = im_open_local( image, "im_eye:1", "p" ); |
| IMAGE *t2 = im_open_local( image, "im_eye:2", "p" ); |
| |
| if( !t1 ) |
| return( -1 ); |
| |
| /* Change range to [0,255]. |
| */ |
| if( im_feye( t1, xsize, ysize, factor ) || |
| im_lintra( 127.5, t1, 127.5, t2 ) || |
| im_clip2fmt( t2, image, IM_BANDFMT_UCHAR ) ) |
| return( -1 ); |
| |
| return( 0 ); |
| } |
| |