/* [<][>][^][v][top][bottom][index][help] */
DEFINITIONS
This source file includes following definitions.
- load_db
- store_db
- out_env
- distance2
- ocr_db
/*
This is a Optical-Character-Recognition program
Copyright (C) 2000-2006 Joerg Schulenburg
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.
see README for EMAIL address
*/
#include <stdio.h>
#include <stdlib.h>
#include "gocr.h"
#include "pnm.h"
#include "pgm2asc.h"
#include <string.h>
#include <time.h>
#define Blen 256
// load boxes from database into boxlist (for faster access)
// used as alternate engine, comparing chars with database
int load_db(void) {
FILE *f1;
char s1[Blen+1],
s2[Blen+1] = "./db/", /* ToDo: replace by constant! by configure */
*s3;
int i, j, ii, i2, line;
struct box *box1;
pix *pp;
if( JOB->cfg.db_path ) strncpy(s2,JOB->cfg.db_path,Blen-1);
i2=strlen(s2);
if (JOB->cfg.verbose)
fprintf(stderr, "# load database %s %s ... ",s2,JOB->cfg.db_path);
strncpy(s2+i2,"db.lst",Blen-i2);s2[Blen]=0;
f1 = fopen(s2, "r");
if (!f1) {
fprintf(stderr, " DB %s not found\n",s2);
return 1;
}
line = 0; /* line counter for better error report */
for (ii = 0; !feof(f1); ii++) {
/* bbg: should write a better input routine */
if (!fgets(s1, Blen, f1)) break; line++;
j = strlen(s1);
/* remove carriage return sequences from line */
while (j > 0 && (s1[j - 1] == '\r' || s1[j - 1] == '\n'))
s1[--j] = 0;
if (!j) continue; /* skip empty line */
if (s1[0]=='#') continue; /* skip comments (v0.44) */
/* copy file name */
for (i = 0; i < j && i+i2 < Blen && strchr(" \t,;",s1[i]) == 0; i++)
s2[i2 + i] = s1[i];
s2[i2+i]=0;
/* skip spaces */
for (; i < j && strchr(" \t",s1[i]) != 0; i++);
/* by now: read pix, fill box, goto next ??? */
pp = (pix *)malloc(sizeof(pix));
if( !pp ) fprintf(stderr,"malloc error in load_db pix\n");
//readpgm(s2, pp, 0 * JOB->cfg.verbose);
fprintf(stderr, "Can't call readpgm()\n");
box1 = (struct box *)malloc_box(NULL);
if(!box1) fprintf(stderr,"malloc error in load_db box1\n");
box1->x0 = 0;
box1->x1 = pp->x-1; // white border 1 pixel width
box1->y0 = 0;
box1->y1 = pp->y-1;
box1->x = 1;
box1->y = 1;
box1->dots = 0;
box1->c = 0;
box1->modifier = 0; /* ToDo: obsolete */
box1->tas[0]=NULL;
box1->tac[0]=0;
box1->wac[0]=100; /* really 100% sure? */
box1->num_ac=1;
if (s1[i]=='"'){ /* parse a string */
j=strrchr(s1+i+1,'"')-(s1+i+1); /* we only look for first and last "" */
if (j>=1) {
s3=(char *)malloc(j+1);
if (!s3) fprintf (stderr, "malloc error in load_db s3\n");
if (s3) {
memcpy(s3,s1+i+1,j);
s3[j]=0;
box1->tas[0]=s3;
// fprintf(stderr,"\nstring=%s",s3);
}
} else { fprintf(stderr,"load_db: string parse error L%d\n",line); }
} else {
box1->tac[0] = box1->c = s1[i]; /* try to interpret as ASCII */
/* we can live without hexcode in future if we use UTF8-strings */
s3=s1+i;
j=strtol( s1+i, &s3, 16); /* try to read 4 to 8 digit hex unicode */
/* if its an hexcode, ASCII interpretation is overwritten */
if( j && i+3<=Blen && s3-s1-i>3 ) box1->tac[0] = box1->c = j;
// fprintf(stderr,"\nhexcode=%04x=%04x %d",(int)j,(int)box1->c,s3-s1-i);
}
box1->num = 0;
box1->line = -1;
box1->m1 = 0; /* ToDo: should be given too in the database! */
box1->m2 = 0;
box1->m3 = 0;
box1->m4 = 0;
box1->p = pp;
list_app(&JOB->tmp.dblist, box1); // append to list
#if 0
out_x(box1);
#endif
}
fclose(f1);
if (JOB->cfg.verbose)
fprintf(stderr, " %d chars loaded\n", ii);
return 0;
}
// expand database from box/boxlist name=db_$utime.pbm
// this is added in version v0.3.3
int store_db(struct box *box1) {
FILE *f1;
char s2[Blen+1] = "./db/", s3[Blen+1];
int i2, dx, dy;
pix b; /* temporary mini page */
if( JOB->cfg.db_path ) strncpy(s2,JOB->cfg.db_path,Blen-1);
i2=strlen(s2);
/* name generation can cause problems, if called twice within a second */
if (box1->num_ac && box1->tas[0])
sprintf(s3,"db_%04x_%lu.pbm", (unsigned int)box1->tas[0][0],
(unsigned long)time(NULL));
else
sprintf(s3,"db_%04x_%lu.pbm", (unsigned int)box1->c,
(unsigned long)time(NULL));
/* ToDo: the file name may be not unique */
strncpy(s2+i2,"db.lst",Blen-i2);s2[Blen]=0;
f1 = fopen(s2, "a");
if (!f1) {
fprintf(stderr, " could not access %s\n",s2);
return 1;
}
strncpy(s2+i2,s3,strlen(s3)); s2[i2+strlen(s3)]=0;
/* store image and infos about the char */
/* ToDo: store the vector list instead of the pixelarray */
if (JOB->cfg.verbose)
fprintf(stderr, "store_db: add file %s to database\n#",s3);
dx=box1->x1-box1->x0+1;
dy=box1->y1-box1->y0+1;
b.p = (unsigned char *) malloc( dx * dy );
if( !b.p ){
fprintf( stderr, "\nFATAL: malloc failed, skip store_db" );
return 2;
}
if (copybox(box1->p, box1->x0, box1->y0, dx, dy, &b, dx * dy))
return -1;
//writepbm(s2,&b); /* What is to do on error? */
free(b.p);
/* store the database line */
/* some infos about box1->m1,..,m4 should added (base line, high etc.) */
if (box1->num_ac && box1->tas[0]) {
fprintf(f1, "%s \"%s\"\n",s3,box1->tas[0]);
/* ToDo: what if tas contains '"'? */
} else {
if( (box1->c >= '0' && box1->c <= '9')
|| (box1->c >= 'A' && box1->c <= 'Z')
|| (box1->c >= 'a' && box1->c <= 'z') )
fprintf(f1, "%s %c\n",s3,(char)box1->c);
else {
if (((box1->c)>>16)>>16)
fprintf(f1, "%s %08x\n",s3,(unsigned int)box1->c);
else
fprintf(f1, "%s %04x\n",s3,(unsigned int)box1->c);
}
}
fclose(f1);
return 0;
}
/* function is only for user prompt on console to identify chars
it prints out a part of pixmap b at point x0,y0 to stderr
using dots .,; if no pixel, and @xoO for pixels
*/
void out_env(struct box *px ){
int x0,y0,x1,y1,dx,dy,x,y,x2,y2,yy0,tx,ty,i,cs;
char c1, c2; pix *b;
cs=JOB->cfg.cs;
yy0=px->y0;
{ /* overwrite rest of arguments */
b=px->p;
x0=px->x0; x1=px->x1; dx=x1-x0+1;
y0=px->y0; y1=px->y1; dy=y1-y0+1;
y0-=2; y1+=2;
if (px->m4 && y0>px->m1) y0=px->m1;
if (px->m4 && y1<px->m4) y1=px->m4;
if (x1-x0+1<52) { x0-=10; x1+=10; } /* fragment? expand frame */
if (x1-x0+1<52) { x0-=10; x1+=10; } /* fragment? expand frame */
if (x1-x0+1<62) { x0-=5; x1+=5; }
if (y1-y0+1<10) { y0-= 4; y1+= 4; } /* fragment? */
if (x0<0) x0=0; if (x1>=b->x) x1=b->x-1;
if (y0<0) y0=0; if (y1>=b->y) y1=b->y-1;
dx=x1-x0+1;
dy=y1-y0+1; yy0=y0;
fprintf(stderr,"\n# show box + environment");
fprintf(stderr,"\n# show box x= %4d %4d d= %3d %3d r= %d %d",
px->x0, px->y0, px->x1 - px->x0 + 1, px->y1 - px->y0 + 1,
px->x - px->x0, px->y - px->y0);
if (px->num_ac){ /* output table of chars and its probabilities */
fprintf(stderr,"\n# list box char: ");
for(i=0;i<px->num_ac && i<NumAlt;i++)
/* output the (xml-)string (picture position, barcodes, glyphs, ...) */
if (px->tas[i])
fprintf(stderr," %s(%d)", px->tas[i] ,px->wac[i]);
else
fprintf(stderr," %s(%d)",decode(px->tac[i],ASCII),px->wac[i]);
}
fprintf(stderr,"\n");
if (px->dots && px->m2 && px->m1<y0) { yy0=px->m1; dy=px->y1-yy0+1; }
}
tx=dx/80+1;
ty=dy/40+1; // step, usually 1, but greater on large maps
fprintf(stderr,"# show pattern x= %4d %4d d= %3d %3d t= %d %d\n",
x0,y0,dx,dy,tx,ty);
if (dx>0)
for(y=yy0;y<yy0+dy;y+=ty) { /* reduce the output to max 78x40 */
/* image is the boxframe + environment in the original bitmap */
for(x=x0;x<x0+dx;x+=tx){ /* by merging sub-pixels */
c1='.';
for(y2=y;y2<y+ty && y2<y0+dy;y2++) /* sub-pixels */
for(x2=x;x2<x+tx && x2<x0+dx;x2++)
{ if((getpixel(b,x2,y2)<cs)) c1='#'; }
// show pixels outside the box thinner/weaker
if (x+tx-1 < px->x0 || x > px->x1
|| y+ty-1 < px->y0 || y > px->y1) c1=((c1=='#')?'O':',');
fprintf(stderr,"%c", c1 );
}
c1=c2=' ';
/* mark lines with < */
if (px) if (y==px->m1 || y==px->m2 || y==px->m3 || y==px->m4) c1='<';
if (y==px->y0 || y==px->y1) c2='-'; /* boxmarks */
fprintf(stderr,"%c%c\n",c1,c2);
}
}
/*
// second variant, for database (with slightly other behaviour)
// new variant
// look at the environment of the pixel too (contrast etc.)
// detailed analysis only of diff pixels!
//
// 100% * distance, 0 is best fit
// = similarity of 2 chars for recognition of noisy chars
// weigth of pixels with only one same neighbour set to 0
// look at contours too!
ToDo: especially on small boxes distance should only be 0 if
characters are 100% identical!
*/
// #define DEBUG 2
int distance2( pix *p1, struct box *box1,
pix *p2, struct box *box2, int cs){
int rc=0,x,y,v1,v2,i1,i2,rgood=0,rbad=0,
x1,y1,x2,y2,dx,dy,dx1,dy1,dx2,dy2,tx,ty;
#if DEBUG == 2
if(JOB->cfg.verbose)
fprintf(stderr," DEBUG: distance2\n");
#endif
x1=box1->x0;y1=box1->y0;x2=box2->x0;y2=box2->y0;
dx1=box1->x1-box1->x0+1; dx2=box2->x1-box2->x0+1; dx=((dx1>dx2)?dx1:dx2);dx=dx1;
dy1=box1->y1-box1->y0+1; dy2=box2->y1-box2->y0+1; dy=((dy1>dy2)?dy1:dy2);dy=dy1;
if(abs(dx1-dx2)>1+dx/16 || abs(dy1-dy2)>1+dy/16) rbad++; // how to weight?
// compare relations to baseline and upper line
if(box1->m4>0 && box2->m4>0){ // used ???
if(2*box1->y1>box1->m3+box1->m4 && 2*box2->y1<box2->m3+box2->m4) rbad+=128;
if(2*box1->y0>box1->m1+box1->m2 && 2*box2->y0<box2->m1+box2->m2) rbad+=128;
}
tx=dx/16; if(dx<17)tx=1; // raster
ty=dy/32; if(dy<33)ty=1;
// compare pixels
for( y=0;y<dy;y+=ty )
for( x=0;x<dx;x+=tx ) { // try global shift too ???
v1=((getpixel(p1,x1+x*dx1/dx,y1+y*dy1/dy)<cs)?1:0); i1=8; // better gray?
v2=((getpixel(p2,x2+x*dx2/dx,y2+y*dy2/dy)<cs)?1:0); i2=8; // better gray?
if(v1==v2) { rgood+=16; continue; } // all things are right!
// what about different pixel???
// test overlapp of surounding pixels ???
v1=1; rbad+=4;
v1=-1;
for(i1=-1;i1<2;i1++)
for(i2=-1;i2<2;i2++)if(i1!=0 || i2!=0){
if( ((getpixel(p1,x1+x*dx1/dx+i1*(1+dx1/32),y1+y*dy1/dy+i2*(1+dy1/32))<cs)?1:0)
!=((getpixel(p2,x2+x*dx2/dx+i1*(1+dx2/32),y2+y*dy2/dy+i2*(1+dy2/32))<cs)?1:0) ) v1++;
}
if(v1>0)
rbad+=16*v1;
}
if(rgood+rbad) rc= 100*rbad/(rgood+rbad); else rc=99;
/* if width/high is not correct add badness */
rc += ( abs(dx1*dy2-dx2*dy1) * 10 ) / (dy1*dy2);
if (rc>100) rc=100;
if(/* rc<10 && */ JOB->cfg.verbose /* &1024 */){
#if DEBUG == 2
fprintf(stderr," distance2 rc=%d rgood=%d rbad=%d\n",rc,rgood,rbad);
// out_b(NULL,p1,box1->x0,box1->y0,box1->x1-box1->x0+1,
// box1->y1-box1->y0+1,cs);
// out_b(NULL,p2,box2->x0,box2->y0,box2->x1-box2->x0+1,
// box2->y1-box2->y0+1,cs);
out_x(box1);
out_x(box2);
#endif
}
return rc;
}
wchar_t ocr_db(struct box *box1) {
int dd = 1000, dist = 1000;
wchar_t c = UNKNOWN;
char buf[200];
Box *box2, *box3;
if (!list_empty(&JOB->tmp.dblist)){
box3 = (Box *)list_get_header(&JOB->tmp.dblist);
if(JOB->cfg.verbose)
fprintf(stderr,"\n#DEBUG: ocr_db (%d,%d) ",box1->x0, box1->y0);
for_each_data(&JOB->tmp.dblist) {
box2 = (Box *)list_get_current(&JOB->tmp.dblist);
/* do preselect!!! distance() slowly */
dd = distance2( box2->p, box2, box1->p, box1, JOB->cfg.cs);
if (dd <= dist) { /* new best fit */
dist = dd;
box3 = box2; /* box3 is a pointer and not copied box2 */
if (dist<100 && 100-dist > JOB->cfg.certainty) {
/* some deviation of the pattern is tolerated */
int i, wa;
for (i=0;i<box3->num_ac;i++) {
wa = (100-dist)*box3->wac[i]/100; /* weight *= (100-dist) */
if (box3->tas[i]) setas(box1,box3->tas[i],wa);
else setac(box1,box3->tac[i],wa);
}
if (box3->num_ac) c=box3->tac[0]; /* 0 for strings (!UNKNOWN) */
if (JOB->cfg.verbose)
fprintf(stderr, " dist=%4d c= %c 0x%02x %s wc= %3d", dist,
((box3->c>32 && box3->c<127) ? (char) box3->c : '.'),
(int)box3->c, ((box3->tas[0])?box3->tas[0]:""), box3->wac[0]);
}
if (dd<=0 && ((box3->num_ac && box3->tas[0]) || box3->c >= 128
|| !strchr ("l1|I0O", box3->c)))
break; /* speedup if found */
}
} end_for_each(&JOB->tmp.dblist);
}
if( (JOB->cfg.mode&128) != 0 && c == UNKNOWN ) { /* prompt the user */
/* should the output go to stderr or special pipe??? */
int utf8_ok=0; /* trigger this flag if input is ok */
int i, endchar; /* index */
out_env(box1); /* old: out_x(box1); */
fprintf(stderr,"The above pattern was not recognized.\n"
"Enter UTF8 char or string for above pattern. Leave empty if unsure.\n"
"Press RET at the end (ALT+RET to store into RAM only) : "
); /* ToDo: empty + alt-return (0x1b 0x0a) for help? ^a for skip all */
/* UTF-8 (man 7 utf-8):
* 7bit = 0xxxxxxx (0000-007F)
* 11bit = 110xxxxx 10xxxxxx (0080-07FF)
* 16bit = 1110xxxx 10xxxxxx 10xxxxxx (0800-FFFF)
* 21bit = 11110xxx 10xxxxxx 10xxxxxx 10xxxxxx
* 26bit = 111110xx 10xxxxxx 10xxxxxx 10xxxxxx 10xxxxxx
* 31bit = 1111110x 10xxxxxx 10xxxxxx 10xxxxxx 10xxxxxx 10xxxxxx
*/
buf[0]=0;
/* shift/ctrl/altgr-enter acts like enter or ^j or ^m,
* alt-enter returns 0x1b 0x0a and returns from fgets()
* ^d (EOF) returns (nil) from fgets()
* x+(2*)ctrl-d returns from fgets() without returning a 0x0a
* if not UTF-input-mode, we are in trouble?
* ^a=0x01, ^b=0x02, ^e=05, ..., ToDo: meaning of no-input or <=space
*/
fgets(buf,200,stdin); /* including \n=0x0a */
dd=strlen(buf);
/* output hexcode if verbose set */
if (JOB->cfg.verbose) {
fprintf(stderr, "\n# fgets [%d]:", dd);
for(i=0; i<dd; i++)
fprintf(stderr, " %02x", (unsigned)((unsigned char)buf[i]));
fprintf(stderr, "\n#");
}
/* we dont accept chars which could destroy database file */
for (i=0; i<dd; i++) if (buf[i]<32) break;
endchar=buf[i]; /* last char is 0x0a (ret) 0x00 (EOF) or 0x1b (alt+ret) */
if (endchar==0x01) { i=0;JOB->cfg.mode&=~128; } /* skip all */
buf[dd=i]=0; /* replace final 0x0a or other special codes */
if (dd==1 && !(buf[0]&128)) { c=buf[0]; utf8_ok=1; } /* single char */
if (dd>1 && dd<7) { /* try to decode single wide char (utf8) */
int u0, u1; /* define UTF8-start sequences, u0=0bits u1=1bits */
u0= 1<<(7-dd); /* compute start byte from UTF8-length */
u1=255&~((1<<(8-dd))-1);
for (i=1;i<dd;i++) if ((buf[i]&0xc0)!=0x80) break; /* 10xxxxxx */
if (i==dd && (buf[0]&(u0|u1))==u1) { utf8_ok=1;
c=buf[0]&(u0-1); /* 11..0x.. */
for (i=1;i<dd;i++) { c<<=6; c|=buf[i]&0x3F; } /* 10xxxxxx */
}
}
if (dd>0){ /* ToDo: skip space and tab too? */
if (utf8_ok==1) { setac(box1, c, 100); } /* store single wchar */
if (utf8_ok==0) { /* store a string of chars (UTF8-string) */
c='_'; /* what should we do with c? probably a bad idea? */
setas(box1, buf, 100);
}
/* decide between
* 0) just help gocr to find the results and (dont remember, 0x01)
* 1) help and remember in the same run (store to memory, 0x1b)
* 2) expand the database (dont store ugly chars to the database!)
*/
if (endchar!=0x01){ /* ^a before hit return */
/* is there a reason to dont store to memory? */
list_app(&JOB->tmp.dblist, box1); /* append to list for 1+2 */
}
if (endchar!=0x01 && endchar!=0x1b){
store_db(box1); /* store to disk for 2 */
}
if (JOB->cfg.verbose)
fprintf(stderr, " got char= %c 16bit= 0x%04x string= \"%s\"\n",
((c>32 && c<127)?(char)c:'.'), (int)c, buf);
}
}
return c;
}