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ssocr.c
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ssocr.c
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/* Seven Segment Optical Character Recognition */
/* 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 3 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, see <http://www.gnu.org/licenses/>.
*/
/* Copyright (C) 2004-2013 Erik Auerswald <[email protected]> */
/* ImLib2 Header */
#include <X11/Xlib.h> /* needed by Imlib2.h */
#include <Imlib2.h>
/* standard things */
#include <stdio.h> /* puts, printf, BUFSIZ, perror, FILE */
#include <stdlib.h> /* exit */
/* string manipulation */
#include <string.h> /* strcpy, strdup */
/* option parsing */
#include <getopt.h> /* getopt */
#include <unistd.h> /* getopt */
/* file permissions */
#include <sys/stat.h> /* umask */
/* my headers */
#include "defines.h" /* defines */
#include "ssocr.h" /* types */
#include "imgproc.h" /* image processing */
#include "help.h" /* online help */
/* global variables */
int ssocr_foreground = SSOCR_BLACK;
int ssocr_background = SSOCR_WHITE;
/* functions */
/* copy image from stdin to a temporary file and return the filename */
static char * tmp_imgfile(int flags)
{
char *dir;
char *name;
size_t pattern_len;
int handle;
unsigned char buf;
ssize_t count = 0;
/* find a suitable place (directory) for the tmp file and create pattern */
dir = getenv("TMP");
if(dir) {
if(flags & DEBUG_OUTPUT)
fprintf(stderr, "using %s for temporary files, from $TMP env variable\n",
dir);
pattern_len = strlen(dir) + strlen(DIR_SEP) + strlen(TMP_FILE_PATTERN) + 1;
} else {
if(flags & DEBUG_OUTPUT)
fprintf(stderr, "using " TMP_FILE_DIR " for temporary files\n");
pattern_len = strlen(TMP_FILE_DIR) + strlen(DIR_SEP)
+ strlen(TMP_FILE_PATTERN) + 1;
}
name = malloc(pattern_len);
if(!name) {
perror("could not allocate memory for name of temporary file");
exit(99);
}
if(dir)
name = strcat(name, dir);
else
name = strcat(name, TMP_FILE_DIR);
name = strcat(name, DIR_SEP);
name = strcat(name, TMP_FILE_PATTERN);
if(flags & DEBUG_OUTPUT)
fprintf(stderr, "pattern for temporary file is %s\n", name);
/* create temporary file */
umask(S_IRWXG | S_IRWXO);
handle = mkstemp(name);
if(handle < 0) {
perror("could not create temporary file");
exit(99);
}
/* copy image data from stdin to tmp file */
while((fread(&buf, sizeof(char), 1, stdin)) > 0) {
count = write(handle, &buf, 1);
if (count <= 0) break;
}
close(handle); /* filehandle is no longer needed, Imlib2 uses filename */
if(ferror(stdin) || (count <= 0)) {
perror("could not copy image data to temporary file");
unlink(name);
exit(99);
}
return name;
}
/*** main() ***/
int main(int argc, char **argv)
{
Imlib_Image image=NULL; /* an image handle */
Imlib_Image new_image=NULL; /* a temporary image handle */
Imlib_Image debug_image=NULL; /* DEBUG */
Imlib_Load_Error load_error=0; /* save Imlib2 error code on image I/O*/
char *imgfile=NULL; /* filename of image file */
int use_tmpfile=0; /* flag to know if temporary image file is used */
int i, j, d; /* iteration variables */
int unknown_digit=0; /* was one of the 6 found digits an unknown one? */
int need_pixels = NEED_PIXELS; /*pixels needed to recognize a segment as set*/
int number_of_digits = NUMBER_OF_DIGITS; /* look for this many digits */
int ignore_pixels = IGNORE_PIXELS; /* pixels to ignore when checking column */
int one_ratio = ONE_RATIO; /* height/width > one_ratio => digit 'one' */
double thresh=THRESHOLD; /* border between light and dark */
int offset; /* offset for shear */
double theta; /* rotation angle */
char *output_file=NULL; /* wrie processed image to file */
char *output_fmt=NULL; /* use this format */
char *debug_image_file=NULL; /* ...to this file */
int flags=0; /* set by options, see #defines on .h file */
luminance_t lt=DEFAULT_LUM_FORMULA; /* luminance function */
int w, h, lum; /* width, height, pixel luminance */
int col=UNKNOWN; /* is column dark or light? */
int row=UNKNOWN; /* is row dark or light? */
int dig_w; /* width of digit part of image */
int dig_h; /* height of digit part of image */
int max_dig_h=0, max_dig_w=0; /* maximum height & width of digits found */
Imlib_Color color; /* Imlib2 RGBA color structure */
/* state of search */
int state = (ssocr_foreground == SSOCR_BLACK) ? FIND_DARK : FIND_LIGHT;
digit_struct *digits=NULL; /* position of digits in image */
int found_pixels=0; /* how many pixels are already found */
/* if we provided no arguments to the program exit */
if (argc < 2) {
usage(argv[0], stderr);
exit(99);
}
/* parse command line */
while (1) {
int option_index = 0;
int c;
static struct option long_options[] = {
{"help", 0, 0, 'h'}, /* print help */
{"version", 0, 0, 'V'}, /* show version */
{"threshold", 1, 0, 't'}, /* set threshold (instead of THRESHOLD) */
{"verbose", 0, 0, 'v'}, /* talk about programm execution */
{"absolute-threshold", 0, 0, 'a'}, /* use treshold value as provided */
{"iter-threshold", 0, 0, 'T'}, /* use treshold value as provided */
{"number-pixels", 1, 0, 'n'}, /* pixels needed to regard segment as set */
{"ignore-pixels", 1, 0, 'i'}, /* pixels ignored when searching digits */
{"number-digits", 1, 0, 'd'}, /* number of digits in image */
{"one-ratio", 1, 0, 'r'}, /* wheight/width threshold to recognize a one */
{"output-image", 1, 0, 'o'}, /* write processed image to given file */
{"output-format", 1, 0, 'O'}, /* format of output image */
{"debug-image", 2, 0, 'D'}, /* write a debug image */
{"process-only", 0, 0, 'p'}, /* image processing only */
{"debug-output", 0, 0, 'P'}, /* print debug output? */
{"foreground", 1, 0, 'f'}, /* set foreground color */
{"background", 1, 0, 'b'}, /* set background color */
{"print-info", 0, 0, 'I'}, /* print image info */
{"adjust-gray", 0, 0, 'g'}, /* use T1 and T2 as perecntages of used vals*/
{"luminance", 1, 0, 'l'}, /* luminance formula */
{0, 0, 0, 0} /* terminate long options */
};
c = getopt_long (argc, argv, "hVt:vaTn:i:d:r:o:O:D::pPf:b:Igl:",
long_options, &option_index);
if (c == -1) break; /* leaves while (1) loop */
switch (c) {
case 'h':
usage(argv[0],stdout);
exit (42);
break;
case 'V':
print_version(stdout);
exit (42);
break;
case 'v':
flags |= VERBOSE;
if(flags & DEBUG_OUTPUT) {
fprintf(stderr, "flags & VERBOSE=%d\n", flags & VERBOSE);
}
break;
case 't':
if(optarg) {
thresh = atof(optarg);
if(flags & DEBUG_OUTPUT) {
fprintf(stderr, "thresh = %f (default: %f)\n", thresh, THRESHOLD);
}
if(thresh < 0.0 || 100.0 < thresh) {
thresh = THRESHOLD;
if(flags & VERBOSE) {
fprintf(stderr, "ignoring --treshold=%s\n", optarg);
}
}
if(flags & DEBUG_OUTPUT) {
fprintf(stderr, "thresh = %f (default: %f)\n", thresh, THRESHOLD);
}
}
break;
case 'a':
flags |= ABSOLUTE_THRESHOLD; break;
case 'T':
flags |= DO_ITERATIVE_THRESHOLD; break;
case 'n':
if(optarg) {
need_pixels = atoi(optarg);
if(need_pixels < 1) {
fprintf(stderr, "warning: ignoring --number-pixels=%s\n", optarg);
need_pixels = NEED_PIXELS;
}
}
break;
case 'i':
if(optarg) {
ignore_pixels = atoi(optarg);
if(ignore_pixels < 0) {
fprintf(stderr, "warning: ignoring --ignore-pixels=%s\n", optarg);
ignore_pixels = IGNORE_PIXELS;
}
}
break;
case 'd':
if(optarg) {
number_of_digits = atoi(optarg);
if((number_of_digits < 1) && (number_of_digits != -1)) {
fprintf(stderr, "warning: ignoring --number-digits=%s\n", optarg);
number_of_digits = NUMBER_OF_DIGITS;
}
}
break;
case 'r':
if(optarg) {
one_ratio = atoi(optarg);
if(one_ratio < 2) {
fprintf(stderr, "warning: ignoring --one-ratio=%s\n", optarg);
one_ratio = ONE_RATIO;
}
}
break;
case 'o':
if(optarg) {
output_file = strdup(optarg);
}
break;
case 'O':
if(optarg) {
output_fmt = strdup(optarg);
}
break;
case 'D':
flags |= USE_DEBUG_IMAGE;
if(optarg) {
debug_image_file = strdup(optarg);
} else {
debug_image_file = strdup(DEBUG_IMAGE_NAME);
}
break;
case 'p':
flags |= PROCESS_ONLY; break;
case 'P':
flags |= DEBUG_OUTPUT; break;
case 'f':
if(optarg) {
if(strcasecmp(optarg, "black") == 0) {
set_fg_color(SSOCR_BLACK);
set_bg_color(SSOCR_WHITE);
} else if(strcasecmp(optarg, "white") == 0) {
set_fg_color(SSOCR_WHITE);
set_bg_color(SSOCR_BLACK);
} else {
fprintf(stderr, "error: unknown foreground color %s,"
" color must be black or white\n", optarg);
exit(99);
}
}
break;
case 'b':
if(optarg) {
if(strcasecmp(optarg, "black") == 0) {
set_bg_color(SSOCR_BLACK);
set_fg_color(SSOCR_WHITE);
} else if(strcasecmp(optarg, "white") == 0) {
set_bg_color(SSOCR_WHITE);
set_fg_color(SSOCR_BLACK);
} else {
fprintf(stderr, "error: unknown background color %s,"
" color must be black or white\n", optarg);
exit(99);
}
}
break;
case 'I':
flags |= PRINT_INFO;
if(flags & DEBUG_OUTPUT) {
fprintf(stderr, "flags & PRINT_INFO=%d\n", flags & PRINT_INFO);
}
break;
case 'g':
flags |= ADJUST_GRAY;
if(flags & DEBUG_OUTPUT) {
fprintf(stderr, "flags & ADJUST_GRAY=%d\n", flags & ADJUST_GRAY);
}
break;
case 'l':
if(optarg) {
lt = parse_lum(optarg);
}
break;
case '?': /* missing argument or character not in optstring */
usage(argv[0],stderr);
exit (2);
break;
default: /* this should not be reached */
if((c>31) && (c<127)) {
fprintf (stderr,
"error: getopt returned unhandled character %c (code %X)\n",
c, c);
} else {
fprintf (stderr,
"error: getopt returned unhandled character code %X\n", c);
}
usage(argv[0], stderr);
exit(99);
}
}
if(flags & DEBUG_OUTPUT) {
fprintf(stderr, "================================================================================\n");
fprintf(stderr, "flags & VERBOSE=%d\nthresh=%f\n", flags & VERBOSE, thresh);
fprintf(stderr, "flags & PRINT_INFO=%d\nflags & ADJUST_GRAY=%d\n",
flags & PRINT_INFO, flags & ADJUST_GRAY);
fprintf(stderr, "flags & ABSOLUTE_THRESHOLD=%d\n",flags&ABSOLUTE_THRESHOLD);
fprintf(stderr, "flags & DO_ITERATIVE_THRESHOLD=%d\n",
flags & DO_ITERATIVE_THRESHOLD);
fprintf(stderr, "need_pixels = %d\n", need_pixels);
fprintf(stderr, "ignore_pixels = %d\n", ignore_pixels);
fprintf(stderr, "number_of_digits = %d\n", number_of_digits);
fprintf(stderr, "foreground = %d (%s)\n", ssocr_foreground,
(ssocr_foreground == SSOCR_BLACK) ? "black" : "white");
fprintf(stderr, "background = %d (%s)\n", ssocr_background,
(ssocr_background == SSOCR_BLACK) ? "black" : "white");
fprintf(stderr, "luminance = ");
print_lum_key(lt, stderr); fprintf(stderr, "\n");
fprintf(stderr, "height/width threshold = %d\n", one_ratio);
fprintf(stderr, "optind=%d argc=%d\n", optind, argc);
fprintf(stderr, "================================================================================\n");
}
/* if no argument left exit the program */
if(optind >= argc) {
fprintf(stderr, "error: no image filename given\n");
usage(argv[0], stderr);
exit(99);
}
if(flags & DEBUG_OUTPUT) {
fprintf(stderr, "argv[argc-1]=%s used as image file name\n", argv[argc-1]);
}
/* load the image */
imgfile = argv[argc-1];
if(strcmp("-", imgfile) == 0) /* read image from stdin? */ {
if(flags & VERBOSE)
fprintf(stderr, "using temporary file to hold data from stdin\n");
use_tmpfile = 1;
imgfile = tmp_imgfile(flags);
}
if(flags & VERBOSE) {
fprintf(stderr, "loading image %s\n", imgfile);
}
image = imlib_load_image_with_error_return(imgfile, &load_error);
if(use_tmpfile) {
if(flags & VERBOSE)
fprintf(stderr, "removing temporary image file %s\n", imgfile);
unlink(imgfile);
free(imgfile);
imgfile = argv[argc-1];
}
if(!image) {
fprintf(stderr, "could not load image %s\n", imgfile);
report_imlib_error(load_error);
exit(99);
}
/* set the image we loaded as the current context image to work on */
imlib_context_set_image(image);
/* get image parameters */
w = imlib_image_get_width();
h = imlib_image_get_height();
if((flags & DEBUG_OUTPUT) || (flags & PRINT_INFO)) {
fprintf(stderr, "image width: %d\nimage height: %d\n",w,h);
}
/* get minimum and maximum "value" values */
if((flags & DEBUG_OUTPUT) || (flags & PRINT_INFO)) {
fprintf(stderr, "%.2f <= lum <= %.2f (lum should be in [0,255])\n",
get_minval(&image, 0, 0, -1, -1, lt),
get_maxval(&image, 0, 0, -1, -1, lt));
}
/* adapt threshold to image */
thresh = adapt_threshold(&image, thresh, lt, 0, 0, -1, -1, flags);
/* process commands */
if(flags & VERBOSE) /* then print found commands */ {
if(optind >= argc-1) {
fprintf(stderr, "no commands given, using image %s unmodified\n",
imgfile);
} else {
fprintf(stderr, "got commands");
for(i=optind; i<argc-1; i++) {
fprintf(stderr, " %s", argv[i]);
if(flags & DEBUG_OUTPUT) {
fprintf(stderr, " (argv[%d])", i);
}
}
fprintf(stderr, "\n");
}
}
if(optind < argc-1) /* then process commands */ {
for(i=optind; i<argc-1; i++) {
if(strcasecmp("dilation",argv[i]) == 0) {
if(flags & VERBOSE) fputs(" processing dilation\n", stderr);
new_image = dilation(&image, thresh, lt);
imlib_context_set_image(image);
imlib_free_image();
image = new_image;
} else if(strcasecmp("erosion",argv[i]) == 0) {
if(flags & VERBOSE) fputs(" processing erosion\n", stderr);
new_image = erosion(&image, thresh, lt);
imlib_context_set_image(image);
imlib_free_image();
image = new_image;
} else if(strcasecmp("opening",argv[i]) == 0) {
int n=atoi(argv[i+1]);
if((n>0) && (i+1<argc-1)) {
if(flags & VERBOSE) {
fprintf(stderr, " processing opening %d", n);
if(flags & DEBUG_OUTPUT) {
fprintf(stderr, " (from string %s)", argv[i+1]);
}
fprintf(stderr, "\n");
}
i++;
new_image = opening(&image, thresh, lt, n);
} else {
if(flags & VERBOSE) fputs(" processing opening (1)\n", stderr);
new_image = opening(&image, thresh, lt, 1);
}
imlib_context_set_image(image);
imlib_free_image();
image = new_image;
} else if(strcasecmp("closing",argv[i]) == 0) {
int n=atoi(argv[i+1]);
if((n>0) && (i+1<argc-1)) {
if(flags & VERBOSE) {
fprintf(stderr, " processing closing %d", n);
if(flags & DEBUG_OUTPUT) {
fprintf(stderr, " (from string %s)", argv[i+1]);
}
fprintf(stderr, "\n");
}
i++;
new_image = closing(&image, thresh, lt, n);
} else {
if(flags & VERBOSE) fputs(" processing closing (1)\n", stderr);
new_image = closing(&image, thresh, lt, 1);
}
imlib_context_set_image(image);
imlib_free_image();
image = new_image;
} else if(strcasecmp("remove_isolated",argv[i]) == 0) {
if(flags & VERBOSE) fputs(" processing remove_isolated\n", stderr);
new_image = remove_isolated(&image, thresh, lt);
imlib_context_set_image(image);
imlib_free_image();
image = new_image;
} else if(strcasecmp("make_mono",argv[i]) == 0) {
if(flags & VERBOSE) fputs(" processing make_mono\n", stderr);
new_image = make_mono(&image, thresh, lt);
imlib_context_set_image(image);
imlib_free_image();
image = new_image;
} else if(strcasecmp("white_border",argv[i]) == 0) {
int bdwidth=atoi(argv[i+1]);
if((bdwidth>0) && (i+1<argc-1)) {
if(flags & VERBOSE) {
fprintf(stderr, " processing white_border %d", bdwidth);
if(flags & DEBUG_OUTPUT) {
fprintf(stderr, " (from string %s)", argv[i+1]);
}
fprintf(stderr, "\n");
}
new_image = white_border(&image, bdwidth);
i++;
} else {
if(flags & VERBOSE)
fputs(" processing white_border (1)\n", stderr);
new_image = white_border(&image, 1);
}
imlib_context_set_image(image);
imlib_free_image();
image = new_image;
} else if(strcasecmp("shear",argv[i]) == 0) {
if(flags & VERBOSE) {
fprintf(stderr, " processing shear %d", atoi(argv[i+1]));
if(flags & DEBUG_OUTPUT) {
fprintf(stderr, " (from string %s)", argv[i+1]);
}
fprintf(stderr, "\n");
}
if(i+1<argc-1) {
offset = (int) atoi(argv[++i]); /* sideeffect: increment i */
new_image = shear(&image, offset);
imlib_context_set_image(image);
imlib_free_image();
image = new_image;
} else {
fprintf(stderr, "error: shear command needs an argument\n");
exit(99);
}
} else if(strcasecmp("set_pixels_filter",argv[i]) == 0) {
int mask;
if(flags & VERBOSE) {
fprintf(stderr," processing set_pixels_filter %d", atoi(argv[i+1]));
if(flags & DEBUG_OUTPUT) {
fprintf(stderr, " (from string %s)", argv[i+1]);
}
fprintf(stderr, "\n");
}
if(i+1<argc-1) {
mask = (int) atoi(argv[++i]); /* sideeffect: increment i */
new_image = set_pixels_filter(&image, thresh, lt, mask);
imlib_context_set_image(image);
imlib_free_image();
image = new_image;
} else {
fprintf(stderr,
"error: set_pixels_filter command needs an argument\n");
exit(99);
}
} else if(strcasecmp("keep_pixels_filter",argv[i]) == 0) {
int mask;
if(flags & VERBOSE) {
fprintf(stderr," processing keep_pixels_filter %d",atoi(argv[i+1]));
if(flags & DEBUG_OUTPUT) {
fprintf(stderr, " (from string %s)", argv[i+1]);
}
fprintf(stderr, "\n");
}
if(i+1<argc-1) {
mask = (int) atoi(argv[++i]); /* sideeffect: increment i */
new_image = keep_pixels_filter(&image, thresh, lt, mask);
imlib_context_set_image(image);
imlib_free_image();
image = new_image;
} else {
fprintf(stderr,
"error: keep_pixels_filter command needs an argument\n");
exit(99);
}
} else if(strcasecmp("dynamic_threshold",argv[i]) == 0) {
if(i+2<argc-1) {
int ww, wh;
ww = atoi(argv[i+1]);
wh = atoi(argv[i+2]);
if(flags & VERBOSE) {
fprintf(stderr, " processing dynamic_threshold %d %d", ww, wh);
if(flags & DEBUG_OUTPUT) {
fprintf(stderr," (from strings %s and %s)",argv[i+1],argv[i+2]);
}
fprintf(stderr, "\n");
}
i+=2; /* skip the arguments to dynamic_threshold */
new_image = dynamic_threshold(&image, thresh, lt, ww, wh);
imlib_context_set_image(image);
imlib_free_image();
image = new_image;
} else {
fprintf(stderr,
"error: dynamic_threshold command needs two arguments\n");
exit(99);
}
} else if(strcasecmp("rgb_threshold",argv[i]) == 0) {
if(flags & VERBOSE) fputs(" processing rgb_threshold\n", stderr);
new_image = make_mono(&image, thresh, MINIMUM);
imlib_context_set_image(image);
imlib_free_image();
image = new_image;
} else if(strcasecmp("r_threshold",argv[i]) == 0) {
if(flags & VERBOSE) fputs(" processing r_threshold\n", stderr);
new_image = make_mono(&image, thresh, RED);
imlib_context_set_image(image);
imlib_free_image();
image = new_image;
} else if(strcasecmp("g_threshold",argv[i]) == 0) {
if(flags & VERBOSE) fputs(" processing g_threshold\n", stderr);
new_image = make_mono(&image, thresh, GREEN);
imlib_context_set_image(image);
imlib_free_image();
image = new_image;
} else if(strcasecmp("b_threshold",argv[i]) == 0) {
if(flags & VERBOSE) fputs(" processing b_threshold\n", stderr);
new_image = make_mono(&image, thresh, BLUE);
imlib_context_set_image(image);
imlib_free_image();
image = new_image;
} else if(strcasecmp("invert",argv[i]) == 0) {
if(flags & VERBOSE) fputs(" processing invert\n", stderr);
new_image = invert(&image, thresh, lt);
imlib_context_set_image(image);
imlib_free_image();
image = new_image;
} else if(strcasecmp("gray_stretch",argv[i]) == 0) {
if(i+2<argc-1) {
double t1, t2;
t1 = atof(argv[i+1]);
t2 = atof(argv[i+2]);
if(flags & VERBOSE) {
fprintf(stderr, " processing gray_stretch %.2f %.2f", t1, t2);
if(flags & DEBUG_OUTPUT) {
fprintf(stderr," (from strings %s and %s)",argv[i+1],argv[i+2]);
}
fprintf(stderr, "\n");
}
if(flags & ADJUST_GRAY) {
double min=-1.0, max=-1.0;
if(flags & VERBOSE) {
fprintf(stderr, " adjusting T1=%.2f and T2=%.2f to image\n",
t1, t2);
}
min = get_minval(&image, 0, 0, -1, -1, lt);
max = get_maxval(&image, 0, 0, -1, -1, lt);
t1 = min + t1/100.0 * (max - min);
t2 = min + t2/100.0 * (max - min);
if(flags & VERBOSE) {
fprintf(stderr, " adjusted to T1=%.2f and T2=%.2f\n", t1, t2);
}
}
i+=2; /* skip the arguments to gray_stretch */
new_image = gray_stretch(&image, t1, t2, lt);
imlib_context_set_image(image);
imlib_free_image();
image = new_image;
} else {
fprintf(stderr,
"error: gray_stretch command needs two arguments\n");
exit(99);
}
} else if(strcasecmp("grayscale",argv[i]) == 0) {
if(flags & VERBOSE) fputs(" processing grayscale\n", stderr);
new_image = grayscale(&image, lt);
imlib_context_set_image(image);
imlib_free_image();
image = new_image;
} else if(strcasecmp("crop",argv[i]) == 0) {
if(i+4<argc-1) {
int x, y, cw, ch; /* lw = crop width, lh = crop height */
x = atoi(argv[i+1]);
y = atoi(argv[i+2]);
cw = atoi(argv[i+3]);
ch = atoi(argv[i+4]);
if(flags & VERBOSE) {
fprintf(stderr,
" cropping from (%d,%d) to (%d,%d) [width %d, height %d]",
x, y, x+cw, y+ch, cw, ch);
if(flags & DEBUG_OUTPUT) {
fprintf(stderr, " (from strings %s, %s, %s, and %s)", argv[i+1],
argv[i+2], argv[i+3], argv[i+4]);
}
fprintf(stderr, "\n");
}
i += 4; /* skip the arguments to crop */
imlib_context_set_image(image);
new_image = crop(&image, x, y, cw, ch);
imlib_context_set_image(image);
imlib_free_image();
image = new_image;
imlib_context_set_image(image);
/* get cropped image dimensions */
w = imlib_image_get_width();
h = imlib_image_get_height();
if((flags & DEBUG_OUTPUT) || (flags & VERBOSE)) {
fprintf(stderr, " cropped image width: %d\n"
" cropped image height: %d\n", w, h);
}
/* get minimum and maximum "value" values in cropped image */
if((flags&DEBUG_OUTPUT) || (flags&PRINT_INFO) || (flags&VERBOSE)) {
fprintf(stderr, " %.2f <= lum <= %.2f in cropped image"
" (lum should be in [0,255])\n",
get_minval(&image, 0, 0, -1, -1, lt),
get_maxval(&image, 0, 0, -1, -1, lt));
}
/* adapt threshold to cropped image */
thresh = adapt_threshold(&image, thresh, lt, 0, 0, -1, -1, flags);
} else {
fprintf(stderr, "error: crop command needs 4 arguments\n");
exit(99);
}
} else if(strcasecmp("rotate",argv[i]) == 0) {
if(flags & VERBOSE) {
fprintf(stderr, " processing rotate %f", atof(argv[i+1]));
if(flags & DEBUG_OUTPUT) {
fprintf(stderr, " (from string %s)", argv[i+1]);
}
fprintf(stderr, "\n");
}
if(i+1<argc-1) {
theta = atof(argv[++i]); /* sideeffect: increment i */
new_image = rotate(&image, theta);
imlib_context_set_image(image);
imlib_free_image();
image = new_image;
} else {
fprintf(stderr, "error: rotate command needs an argument\n");
exit(99);
}
} else {
fprintf(stderr, " unknown command \"%s\"\n", argv[i]);
}
}
}
/* assure we are working with the current image */
imlib_context_set_image(image);
/* write image to file if requested */
if(output_file) {
save_image("output", image, output_fmt, output_file, flags);
}
/* exit if only image processing shall be done */
if(flags & PROCESS_ONLY) exit(3);
if(flags & USE_DEBUG_IMAGE) {
/* copy processed image to debug image */
debug_image = imlib_clone_image();
}
/* allocate memory for seven segment digits */
if(number_of_digits > -1) {
if(!(digits = calloc(number_of_digits, sizeof(digit_struct)))) {
perror("digits = calloc()");
exit(99);
}
} else {
if(!(digits = calloc(1, sizeof(digit_struct)))) {
perror("digits = calloc()");
exit(99);
}
}
/* horizontal partition */
state = (ssocr_foreground == SSOCR_BLACK) ? FIND_DARK : FIND_LIGHT;
d = 0;
for(i=0; i<w; i++) {
/* check if column is completely light or not */
col = UNKNOWN;
found_pixels = 0;
for(j=0; j<h; j++) {
imlib_image_query_pixel(i, j, &color);
lum = get_lum(&color, lt);
if(is_pixel_set(lum, thresh)) /* dark */ {
found_pixels++;
if(found_pixels > ignore_pixels) {
/* 1 dark pixels darken the whole column */
col = (ssocr_foreground == SSOCR_BLACK) ? DARK : LIGHT;
}
} else if(col == UNKNOWN) /* light */ {
col = (ssocr_foreground == SSOCR_BLACK) ? LIGHT : DARK;
}
}
/* save digit position and draw partition line for DEBUG */
if((state == ((ssocr_foreground == SSOCR_BLACK) ? FIND_DARK : FIND_LIGHT))
&& (col == ((ssocr_foreground == SSOCR_BLACK) ? DARK : LIGHT))) {
/* beginning of digit */
if((number_of_digits > -1) && (d >= number_of_digits)) {
fprintf(stderr, "found too many digits (%d)\n", d+1);
imlib_free_image_and_decache();
if(flags & USE_DEBUG_IMAGE) {
save_image("debug", debug_image, output_fmt,debug_image_file,flags);
imlib_context_set_image(debug_image);
imlib_free_image_and_decache();
}
exit(1);
}
digits[d].x1 = i;
digits[d].y1 = 0;
if(flags & USE_DEBUG_IMAGE) {
imlib_context_set_image(debug_image);
imlib_context_set_color(255,0,0,255);/* red line for start of digit */
imlib_image_draw_line(i,0,i,h-1,0);
imlib_context_set_image(image);
}
state = (ssocr_foreground == SSOCR_BLACK) ? FIND_LIGHT : FIND_DARK;
} else if((state ==
((ssocr_foreground == SSOCR_BLACK) ? FIND_LIGHT : FIND_DARK))
&& (col == ((ssocr_foreground == SSOCR_BLACK) ? LIGHT : DARK))){
/* end of digit */
digits[d].x2 = i;
digits[d].y2 = h-1;
d++;
if(flags & USE_DEBUG_IMAGE) {
imlib_context_set_image(debug_image);
imlib_context_set_color(0,0,255,255); /* blue line for end of digit */
imlib_image_draw_line(i,0,i,h-1,0);
imlib_context_set_image(image);
}
/* if number of digits is not known, add memory for another digit */
if(!(digits = realloc(digits, (d+1) * sizeof(digit_struct)))) {
perror("digits = realloc()");
exit(99);
}
/* initialize additional memory */
memset(&digits[d], 0, sizeof(digit_struct));
state = (ssocr_foreground == SSOCR_BLACK) ? FIND_DARK : FIND_LIGHT;
}
}
/* after the loop above the program should be in state FIND_DARK,
* i.e. after the last digit some light was found
* if it is still searching for light end the digit at the border of the
* image */
if(state == (ssocr_foreground == SSOCR_BLACK) ? FIND_LIGHT : FIND_DARK) {
digits[d].x2 = w-1;
digits[d].y2 = h-1;
d++;
state = (ssocr_foreground == SSOCR_BLACK) ? FIND_DARK : FIND_LIGHT;
}
if((number_of_digits > -1) && (d != number_of_digits)) {
fprintf(stderr, "found only %d of %d digits\n", d, number_of_digits);
imlib_free_image_and_decache();
if(flags & USE_DEBUG_IMAGE) {
save_image("debug", debug_image, output_fmt, debug_image_file, flags);
imlib_context_set_image(debug_image);
imlib_free_image_and_decache();
}
exit(1);
} else if(number_of_digits == -1) {
number_of_digits = d;
if(flags & DEBUG_OUTPUT) {
fprintf(stderr, "auto detecting number of digits: %d\n", d);
}
}
dig_w = digits[number_of_digits-1].x2 - digits[0].x1;
dig_h = digits[number_of_digits-1].y2 - digits[0].y1;
/* find upper and lower boundaries of every digit */
for(d=0; d<number_of_digits; d++) {
int found_top=0;
state = (ssocr_foreground == SSOCR_BLACK) ? FIND_DARK : FIND_LIGHT;
/* start from top of image and scan rows for dark pixel(s) */
for(j=0; j<h; j++) {
row = UNKNOWN;
found_pixels = 0;
/* is row dark or light? */
for(i=digits[d].x1; i<=digits[d].x2; i++) {
imlib_image_query_pixel(i,j, &color);
lum = get_lum(&color, lt);
if(is_pixel_set(lum, thresh)) /* dark */ {
found_pixels++;
if(found_pixels > ignore_pixels) {
/* 1 pixels darken row */
row = (ssocr_foreground == SSOCR_BLACK) ? DARK : LIGHT;
}
} else if(row == UNKNOWN) {
row = (ssocr_foreground == SSOCR_BLACK) ? LIGHT : DARK;
}
}
/* save position of digit and draw partition line for DEBUG */
if((state == ((ssocr_foreground == SSOCR_BLACK)?FIND_DARK:FIND_LIGHT))
&& (row == ((ssocr_foreground == SSOCR_BLACK) ? DARK : LIGHT))) {
if(found_top) /* then we are searching for the bottom */ {
digits[d].y2 = j;
state = (ssocr_foreground == SSOCR_BLACK) ? FIND_LIGHT : FIND_DARK;
if(flags & USE_DEBUG_IMAGE) {
imlib_context_set_image(debug_image);
imlib_context_set_color(0,255,0,255); /* green line */
imlib_image_draw_line(digits[d].x1,digits[d].y2,
digits[d].x2,digits[d].y2,0);
imlib_context_set_image(image);
}
} else /* found the top line */ {
digits[d].y1 = j;
found_top = 1;
state = (ssocr_foreground == SSOCR_BLACK) ? FIND_LIGHT : FIND_DARK;
if(flags & USE_DEBUG_IMAGE) {
imlib_context_set_image(debug_image);
imlib_context_set_color(0,255,0,255); /* green line */
imlib_image_draw_line(digits[d].x1,digits[d].y1,
digits[d].x2,digits[d].y1,0);
imlib_context_set_image(image);
}
}
} else if((state ==
((ssocr_foreground == SSOCR_BLACK) ? FIND_LIGHT : FIND_DARK)) &&
(row == ((ssocr_foreground == SSOCR_BLACK) ? LIGHT : DARK))) {
/* found_top has to be 1 because otherwise we were still looking for
* dark */
digits[d].y2 = j;
state = (ssocr_foreground == SSOCR_BLACK) ? FIND_DARK : FIND_LIGHT;
if(flags & USE_DEBUG_IMAGE) {
imlib_context_set_image(debug_image);
imlib_context_set_color(0,255,0,255); /* green line */
imlib_image_draw_line(digits[d].x1,digits[d].y2,
digits[d].x2,digits[d].y2,0);
imlib_context_set_image(image);
}
}
}
/* if we are still looking for light, use the bottom */
if(state == ((ssocr_foreground == SSOCR_BLACK) ? FIND_LIGHT : FIND_DARK)){
digits[d].y2 = h-1;
state = (ssocr_foreground == SSOCR_BLACK) ? FIND_DARK : FIND_LIGHT;
if(flags & USE_DEBUG_IMAGE) {
imlib_context_set_image(debug_image);
imlib_context_set_color(0,255,0,255); /* green line */
imlib_image_draw_line(digits[d].x1,digits[d].y2,
digits[d].x2,digits[d].y2,0);
imlib_context_set_image(image);
}
}
}
if(flags & USE_DEBUG_IMAGE) {
/* draw rectangles around digits */
imlib_context_set_image(debug_image);
imlib_context_set_color(128,128,128,255); /* gray line */
for(d=0; d<number_of_digits; d++) {
imlib_image_draw_rectangle(digits[d].x1, digits[d].y1,
digits[d].x2-digits[d].x1, digits[d].y2-digits[d].y1);
}
imlib_context_set_image(image);
}
/* determine maximum digit dimensions */
for(d=0; d<number_of_digits; d++) {
if(max_dig_w < digits[d].x2 - digits[d].x1)
max_dig_w = digits[d].x2 - digits[d].x1;
if(max_dig_h < digits[d].y2 - digits[d].y1)
max_dig_h = digits[d].y2 - digits[d].y1;
}
if(flags & DEBUG_OUTPUT)
fprintf(stderr, "digits are at most %d pixels wide and %d pixels high\n",
max_dig_w, max_dig_h);
/* debug: write digit info to stderr */
if(flags & DEBUG_OUTPUT) {
fprintf(stderr, "found %d digits\n", d);
for(d=0; d<number_of_digits; d++) {
fprintf(stderr, "digit %d: (%d,%d) -> (%d,%d), width: %d (%5.2f%%) "
"height: %d (%5.2f%%)\n",
d,
digits[d].x1, digits[d].y1, digits[d].x2, digits[d].y2,
digits[d].x2 - digits[d].x1,
((digits[d].x2 - digits[d].x1) * 100.0) / dig_w,
digits[d].y2 - digits[d].y1,
((digits[d].y2 - digits[d].y1) * 100.0) / dig_h
);
fprintf(stderr, " height/width (int): ");
if(digits[d].x1 == digits[d].x2) {
fprintf(stderr, "NaN, max_dig_w/width (int): NaN, ");
} else {
fprintf(stderr, "%d, max_dig_w/width (int): %d, ",
(digits[d].y2-digits[d].y1)/(digits[d].x2-digits[d].x1),
max_dig_w / (digits[d].x2 - digits[d].x1)
);
}
fprintf(stderr, "max_dig_h/height (int): ");
if(digits[d].y1 == digits[d].y2) {
fprintf(stderr, "NaN\n");
} else {
fprintf(stderr, "%d\n",
max_dig_h / (digits[d].y2 - digits[d].y1)
);
}
}
}
/* at this point the digit 1 can be identified, because it is smaller than
* the other digits */
for(i=0; i<number_of_digits; i++) {
/* skip digits with zero width */
if(digits[i].x1 == digits[i].x2) continue;
/* if width of digit is less than 1/one_ratio of its height it is a 1
* (the default 1/3 is arbitarily chosen -- normally seven segment
* displays use digits that are 2 times as high as wide) */