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463 lines
17 KiB
Plaintext
463 lines
17 KiB
Plaintext
/*
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This is a Optical-Character-Recognition program
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Copyright (C) 2000-2009 Joerg Schulenburg
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This program is free software; you can redistribute it and/or
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modify it under the terms of the GNU General Public License
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as published by the Free Software Foundation; either version 2
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of the License, or (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 General Public License for more details.
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You should have received a copy of the GNU 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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see README for EMAIL address
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*/
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#include <stdio.h>
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#include <stdlib.h>
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#include "gocr.h"
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#include "pnm.h"
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#include "pgm2asc.h"
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#include <string.h>
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#include <time.h>
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#define Blen 256
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// load boxes from database into boxlist (for faster access)
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// used as alternate engine, comparing chars with database
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int load_db(void) {
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FILE *f1;
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char s1[Blen+1],
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s2[Blen+1] = "./db/", /* ToDo: replace by constant! by configure */
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*s3;
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int i, j, ii, i2, line;
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struct box *box1;
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pix *pp;
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if( JOB->cfg.db_path ) strncpy(s2,JOB->cfg.db_path,Blen-1);
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i2=strlen(s2);
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if (JOB->cfg.verbose)
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fprintf(stderr, "# load database %s %s ... ",s2,JOB->cfg.db_path);
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strncpy(s2+i2,"db.lst",Blen-i2);s2[Blen]=0;
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f1 = fopen(s2, "r");
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if (!f1) {
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fprintf(stderr, " DB %s not found\n",s2);
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return 1;
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}
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line = 0; /* line counter for better error report */
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for (ii = 0; !feof(f1); ii++) {
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/* bbg: should write a better input routine */
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if (!fgets(s1, Blen, f1)) break; line++;
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j = strlen(s1);
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/* remove carriage return sequences from line */
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while (j > 0 && (s1[j - 1] == '\r' || s1[j - 1] == '\n'))
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s1[--j] = 0;
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if (!j) continue; /* skip empty line */
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if (s1[0]=='#') continue; /* skip comments (v0.44) */
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/* copy file name */
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for (i = 0; i < j && i+i2 < Blen && strchr(" \t,;",s1[i]) == 0; i++)
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s2[i2 + i] = s1[i];
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s2[i2+i]=0;
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/* skip spaces */
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for (; i < j && strchr(" \t",s1[i]) != 0; i++);
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/* by now: read pix, fill box, goto next ??? */
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pp = (pix *)malloc(sizeof(pix));
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if( !pp ) fprintf(stderr,"malloc error in load_db pix\n");
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// if (JOB->cfg.verbose) fprintf(stderr,"\n# readpgm %s ",s2);
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if (readpgm(s2, pp, 0 * JOB->cfg.verbose)!=0) {
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fprintf(stderr,"\ndatabase error: readpgm %s\n", s2);
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exit(-1);
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}
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box1 = (struct box *)malloc_box(NULL);
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if(!box1) fprintf(stderr,"malloc error in load_db box1\n");
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box1->x0 = 0;
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box1->x1 = pp->x-1; // white border 1 pixel width
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box1->y0 = 0;
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box1->y1 = pp->y-1;
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box1->x = 1;
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box1->y = 1;
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box1->dots = 0;
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box1->c = 0;
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box1->modifier = 0; /* ToDo: obsolete */
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box1->tas[0]=NULL;
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box1->tac[0]=0;
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box1->wac[0]=100; /* really 100% sure? */
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box1->num_ac=1;
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if (s1[i]=='"'){ /* parse a string */
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j=strrchr(s1+i+1,'"')-(s1+i+1); /* we only look for first and last "" */
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if (j>=1) {
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s3=(char *)malloc(j+1);
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if (!s3) fprintf (stderr, "malloc error in load_db s3\n");
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if (s3) {
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memcpy(s3,s1+i+1,j);
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s3[j]=0;
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box1->tas[0]=s3;
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// fprintf(stderr,"\nstring=%s",s3);
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}
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} else { fprintf(stderr,"load_db: string parse error L%d\n",line); }
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} else {
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box1->tac[0] = box1->c = s1[i]; /* try to interpret as ASCII */
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/* we can live without hexcode in future if we use UTF8-strings */
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s3=s1+i;
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j=strtol( s1+i, &s3, 16); /* try to read 4 to 8 digit hex unicode */
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/* if its an hexcode, ASCII interpretation is overwritten */
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if( j && i+3<=Blen && s3-s1-i>3 ) box1->tac[0] = box1->c = j;
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// fprintf(stderr,"\nhexcode=%04x=%04x %d",(int)j,(int)box1->c,s3-s1-i);
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}
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box1->num = 0;
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box1->line = -1;
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box1->m1 = 0; /* ToDo: should be given too in the database! */
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box1->m2 = 0;
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box1->m3 = 0;
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box1->m4 = 0;
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box1->p = pp;
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list_app(&JOB->tmp.dblist, box1); // append to list
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#if 0
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out_x(box1);
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#endif
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}
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fclose(f1);
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if (JOB->cfg.verbose)
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fprintf(stderr, " %d chars loaded\n", ii);
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return 0;
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}
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// expand database from box/boxlist name=db_$utime.pbm
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// this is added in version v0.3.3
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int store_db(struct box *box1) {
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FILE *f1;
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char s2[Blen+1] = "./db/", s3[Blen+1];
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int i2, dx, dy;
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unsigned c_out;
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pix b; /* temporary mini page */
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if( JOB->cfg.db_path ) strncpy(s2,JOB->cfg.db_path,Blen-1);
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i2=strlen(s2);
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/* add (first) char and time to the file name for better debugging */
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/* decide between 7bit ASCII and UTF8-char or string */
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c_out = ((box1->num_ac && box1->tas[0]) ?
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(unsigned char )box1->tas[0][0] /* char */ :
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box1->c /* wchar */);
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/* (unsigned int)(( char)0x80) = 0xffffff80 */
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/* (unsigned int)((unsigned char)0x80) = 0x00000080 */
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/* name generation can cause problems, if called twice within a second */
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sprintf(s3,"db_%04x_%08lx.pbm", c_out, (unsigned long)time(NULL));
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/* ToDo: the file name may be not unique */
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strncpy(s2+i2,"db.lst",Blen-i2);s2[Blen]=0;
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f1 = fopen(s2, "a");
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if (!f1) {
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fprintf(stderr, " could not access %s\n",s2);
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return 1;
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}
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strncpy(s2+i2,s3,strlen(s3)); s2[i2+strlen(s3)]=0;
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/* store image and infos about the char */
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/* ToDo: store the vector list instead of the pixelarray */
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if (JOB->cfg.verbose)
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fprintf(stderr, "store_db: add file %s to database (nac=%d c=%04x)"
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"\n#",s3, box1->num_ac, c_out);
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dx=box1->x1-box1->x0+1;
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dy=box1->y1-box1->y0+1;
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b.p = (unsigned char *) malloc( dx * dy );
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if( !b.p ){
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fprintf( stderr, "\nFATAL: malloc failed, skip store_db" );
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return 2;
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}
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if (copybox(box1->p, box1->x0, box1->y0, dx, dy, &b, dx * dy))
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return -1;
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writepbm(s2,&b); /* What is to do on error? */
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free(b.p);
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/* store the database line */
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/* some infos about box1->m1,..,m4 should added (base line, high etc.) */
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if (box1->num_ac && box1->tas[0]) {
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fprintf(f1, "%s \"%s\"\n",s3,box1->tas[0]);
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/* ToDo: what if tas contains '"'? */
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} else {
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if( (box1->c >= '0' && box1->c <= '9')
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|| (box1->c >= 'A' && box1->c <= 'Z')
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|| (box1->c >= 'a' && box1->c <= 'z') )
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fprintf(f1, "%s %c\n",s3,(char)box1->c);
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else {
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if (((box1->c)>>16)>>16)
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fprintf(f1, "%s %08x\n",s3,(unsigned int)box1->c);
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else
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fprintf(f1, "%s %04x\n",s3,(unsigned int)box1->c);
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}
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}
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fclose(f1);
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return 0;
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}
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/* function is only for user prompt on console to identify chars
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it prints out a part of pixmap b at point x0,y0 to stderr
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using dots .,; if no pixel, and @xoO for pixels
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*/
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void out_env(struct box *px ){
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int x0,y0,x1,y1,dx,dy,x,y,x2,y2,yy0,tx,ty,i,cs;
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char c1, c2; pix *b;
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cs=JOB->cfg.cs;
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yy0=px->y0;
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{ /* overwrite rest of arguments */
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b=px->p;
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x0=px->x0; x1=px->x1; dx=x1-x0+1;
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y0=px->y0; y1=px->y1; dy=y1-y0+1;
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y0-=2; y1+=2;
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if (px->m4 && y0>px->m1) y0=px->m1;
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if (px->m4 && y1<px->m4) y1=px->m4;
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if (x1-x0+1<52) { x0-=10; x1+=10; } /* fragment? expand frame */
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if (x1-x0+1<52) { x0-=10; x1+=10; } /* fragment? expand frame */
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if (x1-x0+1<62) { x0-=5; x1+=5; }
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if (y1-y0+1<10) { y0-= 4; y1+= 4; } /* fragment? */
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if (x0<0) x0=0; if (x1>=b->x) x1=b->x-1;
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if (y0<0) y0=0; if (y1>=b->y) y1=b->y-1;
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dx=x1-x0+1;
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dy=y1-y0+1; yy0=y0;
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fprintf(stderr,"\n# show box + environment");
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fprintf(stderr,"\n# show box x= %4d %4d d= %3d %3d r= %d %d",
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px->x0, px->y0, px->x1 - px->x0 + 1, px->y1 - px->y0 + 1,
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px->x - px->x0, px->y - px->y0);
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if (px->num_ac){ /* output table of chars and its probabilities */
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fprintf(stderr,"\n# list box char: ");
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for(i=0;i<px->num_ac && i<NumAlt;i++)
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/* output the (xml-)string (picture position, barcodes, glyphs, ...) */
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if (px->tas[i])
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fprintf(stderr," %s(%d)", px->tas[i] ,px->wac[i]);
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else
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fprintf(stderr," %s(%d)",decode(px->tac[i],ASCII),px->wac[i]);
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}
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fprintf(stderr,"\n");
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if (px->dots && px->m2 && px->m1<y0) { yy0=px->m1; dy=px->y1-yy0+1; }
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}
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tx=dx/80+1;
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ty=dy/40+1; // step, usually 1, but greater on large maps
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fprintf(stderr,"# show pattern x= %4d %4d d= %3d %3d t= %d %d\n",
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x0,y0,dx,dy,tx,ty);
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if (dx>0)
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for(y=yy0;y<yy0+dy;y+=ty) { /* reduce the output to max 78x40 */
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/* image is the boxframe + environment in the original bitmap */
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for(x=x0;x<x0+dx;x+=tx){ /* by merging sub-pixels */
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c1='.';
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for(y2=y;y2<y+ty && y2<y0+dy;y2++) /* sub-pixels */
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for(x2=x;x2<x+tx && x2<x0+dx;x2++)
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{ if((getpixel(b,x2,y2)<cs)) c1='#'; }
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// show pixels outside the box thinner/weaker
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if (x+tx-1 < px->x0 || x > px->x1
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|| y+ty-1 < px->y0 || y > px->y1) c1=((c1=='#')?'O':',');
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fprintf(stderr,"%c", c1 );
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}
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c1=c2=' ';
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/* mark lines with < */
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if (px) if (y==px->m1 || y==px->m2 || y==px->m3 || y==px->m4) c1='<';
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if (y==px->y0 || y==px->y1) c2='-'; /* boxmarks */
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fprintf(stderr,"%c%c\n",c1,c2);
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}
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}
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/*
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// second variant, for database (with slightly other behaviour)
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// new variant
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// look at the environment of the pixel too (contrast etc.)
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// detailed analysis only of diff pixels!
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//
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// 100% * distance, 0 is best fit
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// = similarity of 2 chars for recognition of noisy chars
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// weigth of pixels with only one same neighbour set to 0
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// look at contours too!
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ToDo: especially on small boxes distance should only be 0 if
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characters are 100% identical!
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*/
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// #define DEBUG 2
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int distance2( pix *p1, struct box *box1,
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pix *p2, struct box *box2, int cs){
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int rc=0,x,y,v1,v2,i1,i2,rgood=0,rbad=0,
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x1,y1,x2,y2,dx,dy,dx1,dy1,dx2,dy2,tx,ty;
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#if DEBUG == 2
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if(JOB->cfg.verbose)
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fprintf(stderr," DEBUG: distance2\n");
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#endif
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x1=box1->x0;y1=box1->y0;x2=box2->x0;y2=box2->y0;
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dx1=box1->x1-box1->x0+1; dx2=box2->x1-box2->x0+1; dx=((dx1>dx2)?dx1:dx2);dx=dx1;
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dy1=box1->y1-box1->y0+1; dy2=box2->y1-box2->y0+1; dy=((dy1>dy2)?dy1:dy2);dy=dy1;
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if(abs(dx1-dx2)>1+dx/16 || abs(dy1-dy2)>1+dy/16) rbad++; // how to weight?
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// compare relations to baseline and upper line
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if(box1->m4>0 && box2->m4>0){ // used ???
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if(2*box1->y1>box1->m3+box1->m4 && 2*box2->y1<box2->m3+box2->m4) rbad+=128;
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if(2*box1->y0>box1->m1+box1->m2 && 2*box2->y0<box2->m1+box2->m2) rbad+=128;
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}
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tx=dx/16; if(dx<17)tx=1; // raster
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ty=dy/32; if(dy<33)ty=1;
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// compare pixels
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for( y=0;y<dy;y+=ty )
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for( x=0;x<dx;x+=tx ) { // try global shift too ???
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v1=((getpixel(p1,x1+x*dx1/dx,y1+y*dy1/dy)<cs)?1:0); i1=8; // better gray?
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v2=((getpixel(p2,x2+x*dx2/dx,y2+y*dy2/dy)<cs)?1:0); i2=8; // better gray?
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if(v1==v2) { rgood+=16; continue; } // all things are right!
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// what about different pixel???
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// test overlapp of surounding pixels ???
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v1=1; rbad+=4;
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v1=-1;
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for(i1=-1;i1<2;i1++)
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for(i2=-1;i2<2;i2++)if(i1!=0 || i2!=0){
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if( ((getpixel(p1,x1+x*dx1/dx+i1*(1+dx1/32),y1+y*dy1/dy+i2*(1+dy1/32))<cs)?1:0)
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!=((getpixel(p2,x2+x*dx2/dx+i1*(1+dx2/32),y2+y*dy2/dy+i2*(1+dy2/32))<cs)?1:0) ) v1++;
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}
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if(v1>0)
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rbad+=16*v1;
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}
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if(rgood+rbad) rc= 100*rbad/(rgood+rbad); else rc=99;
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/* if width/high is not correct add badness */
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rc += ( abs(dx1*dy2-dx2*dy1) * 10 ) / (dy1*dy2);
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if (rc>100) rc=100;
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if(/* rc<10 && */ JOB->cfg.verbose /* &1024 */){
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#if DEBUG == 2
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fprintf(stderr," distance2 rc=%d rgood=%d rbad=%d\n",rc,rgood,rbad);
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// out_b(NULL,p1,box1->x0,box1->y0,box1->x1-box1->x0+1,
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// box1->y1-box1->y0+1,cs);
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// out_b(NULL,p2,box2->x0,box2->y0,box2->x1-box2->x0+1,
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// box2->y1-box2->y0+1,cs);
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out_x(box1);
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out_x(box2);
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#endif
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}
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return rc;
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}
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wchar_t ocr_db(struct box *box1) {
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int dd = 1000, dist = 1000;
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wchar_t c = UNKNOWN;
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unsigned char buf[200]; /* Oct08 JS: add unsigned to avoid UTF problems */
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Box *box2, *box3;
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if (!list_empty(&JOB->tmp.dblist)){
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box3 = (Box *)list_get_header(&JOB->tmp.dblist);
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if(JOB->cfg.verbose)
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fprintf(stderr,"\n#DEBUG: ocr_db (%d,%d) ",box1->x0, box1->y0);
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for_each_data(&JOB->tmp.dblist) {
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box2 = (Box *)list_get_current(&JOB->tmp.dblist);
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/* do preselect!!! distance() slowly */
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dd = distance2( box2->p, box2, box1->p, box1, JOB->cfg.cs);
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if (dd <= dist) { /* new best fit */
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dist = dd;
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box3 = box2; /* box3 is a pointer and not copied box2 */
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if (dist<100 && 100-dist >= JOB->cfg.certainty) {
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/* some deviation of the pattern is tolerated */
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int i, wa;
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for (i=0;i<box3->num_ac;i++) {
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wa = (100-dist)*box3->wac[i]/100; /* weight *= (100-dist) */
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if (box3->tas[i]) setas(box1,box3->tas[i],wa);
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else setac(box1,box3->tac[i],wa);
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}
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if (box3->num_ac) c=box3->tac[0]; /* 0 for strings (!UNKNOWN) */
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if (JOB->cfg.verbose)
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fprintf(stderr, " dist=%4d c= %c 0x%02x %s wc= %3d", dist,
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((box3->c>32 && box3->c<127) ? (char) box3->c : '.'),
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(int)box3->c, ((box3->tas[0])?box3->tas[0]:""), box3->wac[0]);
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}
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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((char *)buf,200,stdin); /* including \n=0x0a */
|
|
dd=strlen((char *)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; /* need unsigned char here */
|
|
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);
|
|
/* count number of following 10xxxxxx bytes to i */
|
|
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, (char *)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;
|
|
}
|