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01026af5a2
git-svn-id: https://tesseract-ocr.googlecode.com/svn/trunk@652 d0cd1f9f-072b-0410-8dd7-cf729c803f20
584 lines
19 KiB
C++
584 lines
19 KiB
C++
/* -*-C-*-
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********************************************************************************
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*
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* File: findseam.c (Formerly findseam.c)
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* Description:
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* Author: Mark Seaman, OCR Technology
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* Created: Fri Oct 16 14:37:00 1987
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* Modified: Tue Jul 30 15:44:59 1991 (Mark Seaman) marks@hpgrlt
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* Language: C
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* Package: N/A
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* Status: Reusable Software Component
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*
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* (c) Copyright 1987, Hewlett-Packard Company.
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** Licensed under the Apache License, Version 2.0 (the "License");
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** you may not use this file except in compliance with the License.
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** You may obtain a copy of the License at
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** http://www.apache.org/licenses/LICENSE-2.0
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** Unless required by applicable law or agreed to in writing, software
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** distributed under the License is distributed on an "AS IS" BASIS,
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** WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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** See the License for the specific language governing permissions and
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** limitations under the License.
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*
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*********************************************************************************/
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/*----------------------------------------------------------------------
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I n c l u d e s
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----------------------------------------------------------------------*/
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#include "findseam.h"
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#include "gradechop.h"
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#include "olutil.h"
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#include "plotedges.h"
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#include "outlines.h"
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#include "freelist.h"
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#include "seam.h"
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#include "wordrec.h"
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// Include automatically generated configuration file if running autoconf.
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#ifdef HAVE_CONFIG_H
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#include "config_auto.h"
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#endif
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/*----------------------------------------------------------------------
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T y p e s
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----------------------------------------------------------------------*/
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#define SPLIT_CLOSENESS 20/* Difference in x value */
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/* How many to keep */
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#define MAX_NUM_SEAMS 150
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/* How many to keep */
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#define MAX_OLD_SEAMS 150
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#define NO_FULL_PRIORITY -1/* Special marker for pri. */
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/* Evalute right away */
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#define BAD_PRIORITY 9999.0
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/*----------------------------------------------------------------------
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M a c r o s
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----------------------------------------------------------------------*/
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/**********************************************************************
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* add_seam_to_queue
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*
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* Add this seam value to the seam queue. If the heap is already full
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* then nothing is done.
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**********************************************************************/
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#define add_seam_to_queue(seams,seam,priority) \
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if (seam)\
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{\
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if (HeapFull(seams))\
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junk_worst_seam(seams,seam,priority);\
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else\
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HeapPush (seams, priority, (char*) seam);\
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}
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/**********************************************************************
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* best_seam_priority
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*
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* Return the best priority value on the queue.
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**********************************************************************/
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#define best_seam_priority(seam_queue) \
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(HeapEmpty (seam_queue) ? \
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NO_FULL_PRIORITY : \
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((SEAM*) seam_queue_element(seam_queue, 0))->priority)
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/**********************************************************************
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* create_seam_queue
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*
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* Create a new seam queue with no elements in it.
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**********************************************************************/
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#define create_seam_queue(seam_queue) \
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(seam_queue = MakeHeap (MAX_NUM_SEAMS))
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/**********************************************************************
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* create_seam_pile
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*
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* Create a new seam pile with no elements in it.
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**********************************************************************/
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#define create_seam_pile(seam_pile) \
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(seam_pile = array_new (MAX_OLD_SEAMS))
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/**********************************************************************
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* delete_seam_queue
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*
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* Delete a seam queue along with all the seam structures associated
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* with it.
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**********************************************************************/
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#define delete_seam_queue(seam_queue) \
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(FreeHeapData (seam_queue, delete_seam), \
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seam_queue = NULL) \
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/**********************************************************************
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* pop_next_seam
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*
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* Remove the next seam from the queue. Put the seam and priority
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* values in the requested variables. If there was nothing to pop
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* then return FALSE, else return TRUE.
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**********************************************************************/
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#define pop_next_seam(seams,seam,priority) \
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(HeapPop (seams,&priority,&seam) == TESS_HEAP_OK) \
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/**********************************************************************
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* seam_queue_element
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*
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* Return the element from the seam queue at the requested index.
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**********************************************************************/
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#define seam_queue_element(seam_queue,index) \
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((index < SizeOfHeap (seam_queue)) ? \
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HeapDataFor (seam_queue, index) : \
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NULL) \
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/*----------------------------------------------------------------------
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F u n c t i o n s
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----------------------------------------------------------------------*/
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namespace tesseract {
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/**********************************************************************
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* junk_worst_seam
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*
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* Delete the worst seam from the queue because it is full.
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**********************************************************************/
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void Wordrec::junk_worst_seam(SEAM_QUEUE seams, SEAM *new_seam,
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float new_priority) {
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SEAM *seam;
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float priority;
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HeapPopWorst(seams, &priority, &seam);
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if (priority > new_priority) {
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delete_seam(seam); /*get rid of it */
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HeapPush (seams, new_priority, (char *) new_seam);
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}
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else {
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delete_seam(new_seam);
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HeapPush (seams, priority, (char *) seam);
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}
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}
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/**********************************************************************
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* choose_best_seam
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*
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* Choose the best seam that can be created by assembling this a
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* collection of splits. A queue of all the possible seams is
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* maintained. Each new split received is placed in that queue with
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* its partial priority value. These values in the seam queue are
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* evaluated and combined until a good enough seam is found. If no
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* further good seams are being found then this function returns to the
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* caller, who will send more splits. If this function is called with
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* a split of NULL, then no further splits can be supplied by the
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* caller.
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**********************************************************************/
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void Wordrec::choose_best_seam(SEAM_QUEUE seam_queue,
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SEAM_PILE *seam_pile,
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SPLIT *split,
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PRIORITY priority,
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SEAM **seam_result,
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TBLOB *blob) {
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SEAM *seam;
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char str[80];
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float my_priority;
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/* Add seam of split */
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my_priority = priority;
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if (split != NULL) {
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TPOINT split_point = split->point1->pos;
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split_point += split->point2->pos;
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split_point /= 2;
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seam = new_seam(my_priority, split_point, split, NULL, NULL);
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if (chop_debug > 1)
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print_seam ("Partial priority ", seam);
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add_seam_to_queue (seam_queue, seam, (float) my_priority);
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if (my_priority > chop_good_split)
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return;
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}
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TBOX bbox = blob->bounding_box();
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/* Queue loop */
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while (pop_next_seam (seam_queue, seam, my_priority)) {
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/* Set full priority */
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my_priority = seam_priority (seam, bbox.left(), bbox.right());
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if (chop_debug) {
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sprintf (str, "Full my_priority %0.0f, ", my_priority);
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print_seam(str, seam);
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}
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if ((*seam_result == NULL || /* Replace answer */
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(*seam_result)->priority > my_priority) && my_priority < chop_ok_split) {
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/* No crossing */
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if (constrained_split (seam->split1, blob)) {
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delete_seam(*seam_result);
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clone_seam(*seam_result, seam);
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(*seam_result)->priority = my_priority;
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}
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else {
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delete_seam(seam);
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seam = NULL;
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my_priority = BAD_PRIORITY;
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}
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}
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if (my_priority < chop_good_split) {
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if (seam)
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delete_seam(seam);
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return; /* Made good answer */
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}
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if (seam) {
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/* Combine with others */
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if (array_count (*seam_pile) < MAX_NUM_SEAMS
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/*|| tessedit_truncate_chopper==0 */ ) {
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combine_seam(seam_queue, *seam_pile, seam);
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*seam_pile = array_push (*seam_pile, seam);
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}
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else
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delete_seam(seam);
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}
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my_priority = best_seam_priority (seam_queue);
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if ((my_priority > chop_ok_split) ||
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(my_priority > chop_good_split && split))
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return;
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}
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}
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/**********************************************************************
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* combine_seam
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*
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* Find other seams to combine with this one. The new seams that result
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* from this union should be added to the seam queue. The return value
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* tells whether or not any additional seams were added to the queue.
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**********************************************************************/
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void Wordrec::combine_seam(SEAM_QUEUE seam_queue, SEAM_PILE seam_pile,
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SEAM *seam) {
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register inT16 x;
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register inT16 dist;
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inT16 bottom1, top1;
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inT16 bottom2, top2;
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SEAM *new_one;
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SEAM *this_one;
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bottom1 = seam->split1->point1->pos.y;
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if (seam->split1->point2->pos.y >= bottom1)
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top1 = seam->split1->point2->pos.y;
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else {
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top1 = bottom1;
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bottom1 = seam->split1->point2->pos.y;
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}
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if (seam->split2 != NULL) {
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bottom2 = seam->split2->point1->pos.y;
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if (seam->split2->point2->pos.y >= bottom2)
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top2 = seam->split2->point2->pos.y;
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else {
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top2 = bottom2;
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bottom2 = seam->split2->point2->pos.y;
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}
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}
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else {
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bottom2 = bottom1;
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top2 = top1;
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}
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array_loop(seam_pile, x) {
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this_one = (SEAM *) array_value (seam_pile, x);
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dist = seam->location.x - this_one->location.x;
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if (-SPLIT_CLOSENESS < dist &&
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dist < SPLIT_CLOSENESS &&
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seam->priority + this_one->priority < chop_ok_split) {
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inT16 split1_point1_y = this_one->split1->point1->pos.y;
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inT16 split1_point2_y = this_one->split1->point2->pos.y;
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inT16 split2_point1_y = 0;
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inT16 split2_point2_y = 0;
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if (this_one->split2) {
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split2_point1_y = this_one->split2->point1->pos.y;
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split2_point2_y = this_one->split2->point2->pos.y;
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}
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if (
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/*!tessedit_fix_sideways_chops || */
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(
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/* this_one->split1 always exists */
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(
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((split1_point1_y >= top1 && split1_point2_y >= top1) ||
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(split1_point1_y <= bottom1 && split1_point2_y <= bottom1))
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&&
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((split1_point1_y >= top2 && split1_point2_y >= top2) ||
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(split1_point1_y <= bottom2 && split1_point2_y <= bottom2))
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)
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)
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&&
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(
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this_one->split2 == NULL ||
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(
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((split2_point1_y >= top1 && split2_point2_y >= top1) ||
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(split2_point1_y <= bottom1 && split2_point2_y <= bottom1))
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&&
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((split2_point1_y >= top2 && split2_point2_y >= top2) ||
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(split2_point1_y <= bottom2 && split2_point2_y <= bottom2))
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)
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)
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) {
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new_one = join_two_seams (seam, this_one);
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if (chop_debug > 1)
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print_seam ("Combo priority ", new_one);
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add_seam_to_queue (seam_queue, new_one, new_one->priority);
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}
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}
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}
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}
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/**********************************************************************
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* constrained_split
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*
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* Constrain this split to obey certain rules. It must not cross any
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* inner outline. It must not cut off a small chunk of the outline.
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**********************************************************************/
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inT16 Wordrec::constrained_split(SPLIT *split, TBLOB *blob) {
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TESSLINE *outline;
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if (is_little_chunk (split->point1, split->point2))
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return (FALSE);
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for (outline = blob->outlines; outline; outline = outline->next) {
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if (split_bounds_overlap (split, outline) &&
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crosses_outline (split->point1, split->point2, outline->loop)) {
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return (FALSE);
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}
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}
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return (TRUE);
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}
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/**********************************************************************
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* delete_seam_pile
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*
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* Delete the seams that are held in the seam pile. Destroy the splits
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* that are referenced by these seams.
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**********************************************************************/
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void Wordrec::delete_seam_pile(SEAM_PILE seam_pile) {
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inT16 x;
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array_loop(seam_pile, x) {
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delete_seam ((SEAM *) array_value (seam_pile, x));
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}
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array_free(seam_pile);
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}
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/**********************************************************************
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* pick_good_seam
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*
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* Find and return a good seam that will split this blob into two pieces.
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* Work from the outlines provided.
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**********************************************************************/
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SEAM *Wordrec::pick_good_seam(TBLOB *blob) {
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SEAM_QUEUE seam_queue;
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SEAM_PILE seam_pile;
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POINT_GROUP point_heap;
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PRIORITY priority;
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EDGEPT *edge;
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EDGEPT *points[MAX_NUM_POINTS];
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EDGEPT_CLIST new_points;
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SEAM *seam = NULL;
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TESSLINE *outline;
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inT16 num_points = 0;
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#ifndef GRAPHICS_DISABLED
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if (chop_debug > 2)
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wordrec_display_splits.set_value(true);
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draw_blob_edges(blob);
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#endif
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point_heap = MakeHeap (MAX_NUM_POINTS);
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for (outline = blob->outlines; outline; outline = outline->next)
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prioritize_points(outline, point_heap);
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while (HeapPop (point_heap, &priority, &edge) == TESS_HEAP_OK) {
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if (num_points < MAX_NUM_POINTS)
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points[num_points++] = (EDGEPT *) edge;
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}
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FreeHeap(point_heap);
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/* Initialize queue & pile */
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create_seam_pile(seam_pile);
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create_seam_queue(seam_queue);
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try_point_pairs(points, num_points, seam_queue, &seam_pile, &seam, blob);
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try_vertical_splits(points, num_points, &new_points,
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seam_queue, &seam_pile, &seam, blob);
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if (seam == NULL) {
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choose_best_seam(seam_queue, &seam_pile, NULL, BAD_PRIORITY, &seam, blob);
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}
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else if (seam->priority > chop_good_split) {
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choose_best_seam (seam_queue, &seam_pile, NULL, seam->priority,
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&seam, blob);
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}
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EDGEPT_C_IT it(&new_points);
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for (it.mark_cycle_pt(); !it.cycled_list(); it.forward()) {
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EDGEPT *inserted_point = it.data();
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if (!point_used_by_seam(seam, inserted_point)) {
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remove_edgept(inserted_point);
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}
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}
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delete_seam_queue(seam_queue);
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delete_seam_pile(seam_pile);
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if (seam) {
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if (seam->priority > chop_ok_split) {
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delete_seam(seam);
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seam = NULL;
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}
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#ifndef GRAPHICS_DISABLED
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else if (wordrec_display_splits) {
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if (seam->split1)
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mark_split (seam->split1);
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if (seam->split2)
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mark_split (seam->split2);
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if (seam->split3)
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mark_split (seam->split3);
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if (chop_debug > 2) {
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update_edge_window();
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edge_window_wait();
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}
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}
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#endif
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}
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if (chop_debug)
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wordrec_display_splits.set_value(false);
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return (seam);
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}
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/**********************************************************************
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* seam_priority
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*
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* Assign a full priority value to the seam.
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**********************************************************************/
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PRIORITY Wordrec::seam_priority(SEAM *seam, inT16 xmin, inT16 xmax) {
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PRIORITY priority;
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if (seam->split1 == NULL)
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priority = 0;
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else if (seam->split2 == NULL) {
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priority = (seam->priority +
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full_split_priority (seam->split1, xmin, xmax));
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}
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else if (seam->split3 == NULL) {
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split_outline (seam->split2->point1, seam->split2->point2);
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priority = (seam->priority +
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full_split_priority (seam->split1, xmin, xmax));
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unsplit_outlines (seam->split2->point1, seam->split2->point2);
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}
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else {
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split_outline (seam->split2->point1, seam->split2->point2);
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split_outline (seam->split3->point1, seam->split3->point2);
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priority = (seam->priority +
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full_split_priority (seam->split1, xmin, xmax));
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unsplit_outlines (seam->split3->point1, seam->split3->point2);
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unsplit_outlines (seam->split2->point1, seam->split2->point2);
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}
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return (priority);
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}
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/**********************************************************************
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* try_point_pairs
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*
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* Try all the splits that are produced by pairing critical points
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* together. See if any of them are suitable for use. Use a seam
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* queue and seam pile that have already been initialized and used.
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**********************************************************************/
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void Wordrec::try_point_pairs (EDGEPT * points[MAX_NUM_POINTS],
|
|
inT16 num_points,
|
|
SEAM_QUEUE seam_queue,
|
|
SEAM_PILE * seam_pile,
|
|
SEAM ** seam,
|
|
TBLOB * blob) {
|
|
inT16 x;
|
|
inT16 y;
|
|
SPLIT *split;
|
|
PRIORITY priority;
|
|
|
|
for (x = 0; x < num_points; x++) {
|
|
for (y = x + 1; y < num_points; y++) {
|
|
|
|
if (points[y] &&
|
|
weighted_edgept_dist(points[x], points[y],
|
|
chop_x_y_weight) < chop_split_length &&
|
|
points[x] != points[y]->next &&
|
|
points[y] != points[x]->next &&
|
|
!is_exterior_point(points[x], points[y]) &&
|
|
!is_exterior_point(points[y], points[x])) {
|
|
split = new_split (points[x], points[y]);
|
|
priority = partial_split_priority (split);
|
|
|
|
choose_best_seam(seam_queue, seam_pile, split, priority, seam, blob);
|
|
}
|
|
}
|
|
}
|
|
|
|
}
|
|
|
|
|
|
/**********************************************************************
|
|
* try_vertical_splits
|
|
*
|
|
* Try all the splits that are produced by vertical projection to see
|
|
* if any of them are suitable for use. Use a seam queue and seam pile
|
|
* that have already been initialized and used.
|
|
* Return in new_points a collection of points that were inserted into
|
|
* the blob while examining vertical splits and which may safely be
|
|
* removed once a seam is chosen if they are not part of the seam.
|
|
**********************************************************************/
|
|
void Wordrec::try_vertical_splits(EDGEPT * points[MAX_NUM_POINTS],
|
|
inT16 num_points,
|
|
EDGEPT_CLIST *new_points,
|
|
SEAM_QUEUE seam_queue,
|
|
SEAM_PILE * seam_pile,
|
|
SEAM ** seam,
|
|
TBLOB * blob) {
|
|
EDGEPT *vertical_point = NULL;
|
|
SPLIT *split;
|
|
inT16 x;
|
|
PRIORITY priority;
|
|
TESSLINE *outline;
|
|
|
|
for (x = 0; x < num_points; x++) {
|
|
vertical_point = NULL;
|
|
for (outline = blob->outlines; outline; outline = outline->next) {
|
|
vertical_projection_point(points[x], outline->loop,
|
|
&vertical_point, new_points);
|
|
}
|
|
|
|
if (vertical_point &&
|
|
points[x] != vertical_point->next &&
|
|
vertical_point != points[x]->next &&
|
|
weighted_edgept_dist(points[x], vertical_point,
|
|
chop_x_y_weight) < chop_split_length) {
|
|
|
|
split = new_split (points[x], vertical_point);
|
|
priority = partial_split_priority (split);
|
|
|
|
choose_best_seam(seam_queue, seam_pile, split, priority, seam, blob);
|
|
}
|
|
}
|
|
}
|
|
|
|
}
|