From: Rekhesh Mohan Date: Tue, 10 Jul 2012 22:24:49 +0000 (+0530) Subject: new options: jpeg quality, pixel range, negative image. X-Git-Url: https://cads.iiap.res.in/gitview/?a=commitdiff_plain;h=e31da38fa70e45758bd0c82b124c018c25e78e23;p=fits2jpeg.git new options: jpeg quality, pixel range, negative image. new files: fits2jpeg.h, image.c (image ops) and messages.c --- diff --git a/src/fits2jpeg.h b/src/fits2jpeg.h new file mode 100644 index 0000000..1389f6b --- /dev/null +++ b/src/fits2jpeg.h @@ -0,0 +1,50 @@ +/*************************************************************************** + * This file is a part of CADS/UVS fits2jpeg conversion software * + * Copyright (C) 2012 by CADS/UV Software Team, * + * Indian Institute of Astrophysics * + * Bangalore 560034 * + * cads_AT_iiap.res.in * + * * + * 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 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 General Public License for more details. * + * * + * You should have received a copy of the GNU 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. * + ***************************************************************************/ + +#ifdef HAVE_CONFIG_H +#include +#endif + +/*Header Definitions*/ +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include + +#define PROGRAM "fits2jpeg" +#define r2d (90./atan2(1,0)) +#define MAX_TEXT 150 + +int my_getopt(int, char * const *, const char *); +void signals_handler(int); +void set_signals(void); +void printinfo(const char *); +void printwarn(const char *); +void printerro(const char *); +void scale_image(int, int, float *, JSAMPLE *); diff --git a/src/image.c b/src/image.c new file mode 100644 index 0000000..7a068e9 --- /dev/null +++ b/src/image.c @@ -0,0 +1,158 @@ +/*************************************************************************** + * This file is a part of CADS/UVS fits2jpeg conversion software * + * Copyright (C) 2012 by CADS/UV Software Team, * + * Indian Institute of Astrophysics * + * Bangalore 560034 * + * cads_AT_iiap.res.in * + * * + * 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 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 General Public License for more details. * + * * + * You should have received a copy of the GNU 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. * + ***************************************************************************/ + +/*Header Definitions*/ +#include "fits2jpeg.h" + +void scale_image(int scale, int npixels, + float *data, JSAMPLE *image_buffer) +{ + unsigned int i = 0; + int JMAXVAL = 255; + float datamax = 0.0, datamin = 0.0, tmp = 0.0; + float hist[256] = {0.0}, cumhist[256] = {0.0}; + float scl_data = 0.0; + + + /* first find min & max in data */ + datamax = -1.0 * FLT_MAX; + datamin = FLT_MAX; + for (i = 0; i < npixels; ++i) + { + if (data[i] > datamax) datamax = data[i]; + if (data[i] < datamin) datamin = data[i]; + } /*endfor*/ + + /* Convert data into bytscaled values for jpeg file */ + /* the dynamic range is reduced to 255 for jpeg */ + scl_data = (datamax - datamin)/(float)JMAXVAL; + for (i = 0; i < npixels; ++i) + data[i] = (data[i] - datamin)/scl_data; + + /* All data is now squeezed into the range 0 - 255 */ + /* NOTE: At this point onwards min & max is 0 and 255 respectively */ + datamax = (float)JMAXVAL; + datamin = 0.0; + + /* initialize image histogram. ensure all are zeroes in hist[] */ + /*-------------------------------------------------------------------*/ + for (i = 0; i <= JMAXVAL; ++i) hist[i] = 0; + + /* construct the image histogram */ + tmp = 1.0/(float)npixels; + for (i = 0; i <= npixels; ++i) + hist[(int)floor(data[i])] += tmp; + + /* And the cumulative histogram */ + cumhist[0] = hist[0]; + for (i = 1; i <= JMAXVAL; ++i) + cumhist[i] += cumhist[i - 1] + hist[i]; + + /* Linear scale (min-max) : This is the default scaling + * if we dont generate image_buffer here, histo-eq will fail */ + for (i = 0; i < npixels; ++i) + image_buffer[i] = (int)(data[i]); + + /*-------------------------------------------------------------------*/ + + + switch (scale) + { + case 1 : /* Square root */ + printinfo("Using square-root scale"); + scl_data = sqrt((float)JMAXVAL)/(float)JMAXVAL; + for (i = 0; i < npixels; ++i) + image_buffer[i] = (int)(sqrt(data[i])/scl_data); + break; + + case 2 : /* Square */ + printinfo("Using quadratic scale"); + scl_data = pow((float)JMAXVAL,2)/(float)JMAXVAL; + for (i = 0; i < npixels; ++i) + image_buffer[i] = (int)abs((pow(data[i],2) - 1.0)/scl_data); + break; + + case 3 : /* Cubic */ + printinfo("Using cubic scale"); + scl_data = pow((float)JMAXVAL,3)/(float)JMAXVAL; + for (i = 0; i < npixels; ++i) + image_buffer[i] = (int)abs((pow(data[i],3) - 1.0)/scl_data); + break; + + case 4 : /* log */ + printinfo("Using log scale"); + scl_data = log(1.0 + (float)JMAXVAL)/(float)JMAXVAL; + for (i = 0; i < npixels; ++i) + image_buffer[i] = (int)((log(abs(data[i]) + 1.0))/scl_data); + break; + + case 5 : + /* contrast stretch */ + printinfo("Performing histogram stretch (normalization)"); + + /* We need to go through the cumulative histogram to pick the + * appropriate values for datamin and datamax */ + i = 0; + while (i < JMAXVAL) + { + if (cumhist[i] >= 0.01) + { + datamin = (float) i; + break; + } + i++; + } + i = JMAXVAL; + while (i > 0) + { + if (cumhist[i] <= 0.99) + { + datamax = (float) i; + break; + } + i--; + } + scl_data = (datamax - datamin)/(float)JMAXVAL; + for (i = 0; i < npixels; ++i) + { + if (image_buffer[i] >= datamax) + image_buffer[i] = JMAXVAL; + else if (image_buffer[i] <= datamin) + image_buffer[i] = 0; + else + image_buffer[i] = (int) abs((image_buffer[i] - datamin)/scl_data); + } + break; + + case 6 : + /* histogram equalization */ + printinfo("Performing Histogram Equalization"); + for (i = 0; i < npixels; ++i) + image_buffer[i] = cumhist[image_buffer[i]] * 255; + break; + default : + printinfo("Using linear scale"); + break; + } + +} diff --git a/src/messages.c b/src/messages.c new file mode 100644 index 0000000..4386e55 --- /dev/null +++ b/src/messages.c @@ -0,0 +1,90 @@ +/*************************************************************************** + * This file is a part of CADS/UVS fits2jpeg conversion software * + * Copyright (C) 2012 by CADS/UV Software Team, * + * Indian Institute of Astrophysics * + * Bangalore 560034 * + * cads_AT_iiap.res.in * + * * + * 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 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 General Public License for more details. * + * * + * You should have received a copy of the GNU 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. * + ***************************************************************************/ + +/*Header Definitions*/ +#include "fits2jpeg.h" + +/*---------------------------------------------------------------------------*/ +void PRINT_BANNER() +{ + printf("\n"); + printf(" %s %s\n", PROGRAM, VERSION); + printf(" Converts fits image files to jpeg\n"); + printf("-----------------------------------------------------------\n"); +} +/*---------------------------------------------------------------------------*/ +void usage() +{ + printf ("\n Usage: fits2jpeg [options] \n"); + printf (" Options are: \n"); + printf (" -h help \n"); + printf (" -s \n"); + printf (" scale for output image, where can be: \n"); + printf (" linear Linear scale, default \n"); + printf (" sqroot for square root scale \n"); + printf (" square for quadratic scale \n"); + printf (" cubic for cubic scale \n"); + printf (" log for log scale \n"); + printf (" normalize for linear histogram stretch \n"); + printf (" equalize for histogram equalization \n"); + printf (" -c : \n"); + printf (" Clip output image to min-max range. Eg: \n"); + printf (" 0:100 Use only values in the range 0-100 \n"); + printf (" 100:0 Same as above, but negative image \n"); + printf (" :10 Clip everything above 10 \n"); + printf (" 10: Clip everything below 10 \n"); + printf (" -n \n"); + printf (" Negate the image \n"); + printf (" -q \n"); + printf (" quality factor. Defines the jpeg encoding quality \n"); + printf (" Valid range: 0-100, default value: 100 (max.quality)\n"); + printf (" -z \n"); + printf (" Resize/Scale output image by . Eg: \n"); + printf (" 0.5 Shrink output to half of input \n"); + printf (" 2.0 Magnify output to double the size \n"); + printf (" Output will be written to .jpg. Wild card\n"); + printf (" entries allowed in ; For eg: *.fits, m31*.fits\n"); + printf (" ngc???.fits etc. \n"); + printf ("-----------------------------------------------------------\n"); + printf ("Copyright (c) 2012 The CADS Team, IIAp. [GPL v3.0 or later]\n"); + printf ("Report Bugs to: http://cads.iiap.res.in/bugzilla \n"); + printf ("Documentation : http://cads.iiap.res.in/software \n\n"); + exit(1); +} + +void printinfo(const char * msg) +{ + fprintf(stdout, "INFO : %s\n", msg); +} + +void printwarn(const char * msg) +{ + fprintf(stdout, "WARNING: %s\n", msg); +} + +void printerro(const char * msg) +{ + fprintf(stderr, "ERROR : %s\n", msg); + exit(EXIT_FAILURE); +} +