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topitch.cpp
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topitch.cpp
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/**********************************************************************
* File: topitch.cpp (Formerly to_pitch.c)
* Description: Code to determine fixed pitchness and the pitch if fixed.
* Author: Ray Smith
*
* (C) Copyright 1993, Hewlett-Packard Ltd.
** Licensed under the Apache License, Version 2.0 (the "License");
** you may not use this file except in compliance with the License.
** You may obtain a copy of the License at
** http://www.apache.org/licenses/LICENSE-2.0
** Unless required by applicable law or agreed to in writing, software
** distributed under the License is distributed on an "AS IS" BASIS,
** WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
** See the License for the specific language governing permissions and
** limitations under the License.
*
**********************************************************************/
#include "blobbox.h"
#include "statistc.h"
#include "drawtord.h"
#include "makerow.h"
#include "pitsync1.h"
#include "pithsync.h"
#include "tovars.h"
#include "wordseg.h"
#include "topitch.h"
#include "helpers.h"
// Include automatically generated configuration file if running autoconf.
#ifdef HAVE_CONFIG_H
#include "config_auto.h"
#endif
#include <memory>
static BOOL_VAR (textord_all_prop, false, "All doc is proportial text");
BOOL_VAR (textord_debug_pitch_test, false,
"Debug on fixed pitch test");
static BOOL_VAR (textord_disable_pitch_test, false,
"Turn off dp fixed pitch algorithm");
BOOL_VAR (textord_fast_pitch_test, false,
"Do even faster pitch algorithm");
BOOL_VAR (textord_debug_pitch_metric, false,
"Write full metric stuff");
BOOL_VAR (textord_show_row_cuts, false, "Draw row-level cuts");
BOOL_VAR (textord_show_page_cuts, false, "Draw page-level cuts");
BOOL_VAR (textord_pitch_cheat, false,
"Use correct answer for fixed/prop");
BOOL_VAR (textord_blockndoc_fixed, false,
"Attempt whole doc/block fixed pitch");
double_VAR (textord_projection_scale, 0.200, "Ding rate for mid-cuts");
double_VAR (textord_balance_factor, 1.0,
"Ding rate for unbalanced char cells");
#define BLOCK_STATS_CLUSTERS 10
#define MAX_ALLOWED_PITCH 100 //max pixel pitch.
// qsort function to sort 2 floats.
static int sort_floats(const void *arg1, const void *arg2) {
float diff = *reinterpret_cast<const float*>(arg1) -
*reinterpret_cast<const float*>(arg2);
if (diff > 0) {
return 1;
} else if (diff < 0) {
return -1;
} else {
return 0;
}
}
/**********************************************************************
* compute_fixed_pitch
*
* Decide whether each row is fixed pitch individually.
* Correlate definite and uncertain results to obtain an individual
* result for each row in the TO_ROW class.
**********************************************************************/
void compute_fixed_pitch(ICOORD page_tr, // top right
TO_BLOCK_LIST* port_blocks, // input list
float gradient, // page skew
FCOORD rotation, // for drawing
bool testing_on) { // correct orientation
TO_BLOCK_IT block_it; //iterator
TO_BLOCK *block; //current block;
TO_ROW *row; //current row
int block_index; //block number
int row_index; //row number
#ifndef GRAPHICS_DISABLED
if (textord_show_initial_words && testing_on) {
if (to_win == nullptr)
create_to_win(page_tr);
}
#endif
block_it.set_to_list (port_blocks);
block_index = 1;
for (block_it.mark_cycle_pt (); !block_it.cycled_list ();
block_it.forward ()) {
block = block_it.data ();
compute_block_pitch(block, rotation, block_index, testing_on);
block_index++;
}
if (!try_doc_fixed (page_tr, port_blocks, gradient)) {
block_index = 1;
for (block_it.mark_cycle_pt (); !block_it.cycled_list ();
block_it.forward ()) {
block = block_it.data ();
if (!try_block_fixed (block, block_index))
try_rows_fixed(block, block_index, testing_on);
block_index++;
}
}
block_index = 1;
for (block_it.mark_cycle_pt(); !block_it.cycled_list();
block_it.forward()) {
block = block_it.data ();
POLY_BLOCK* pb = block->block->pdblk.poly_block();
if (pb != nullptr && !pb->IsText()) continue; // Non-text doesn't exist!
// row iterator
TO_ROW_IT row_it(block->get_rows());
row_index = 1;
for (row_it.mark_cycle_pt (); !row_it.cycled_list (); row_it.forward ()) {
row = row_it.data ();
fix_row_pitch(row, block, port_blocks, row_index, block_index);
row_index++;
}
block_index++;
}
#ifndef GRAPHICS_DISABLED
if (textord_show_initial_words && testing_on) {
ScrollView::Update();
}
#endif
}
/**********************************************************************
* fix_row_pitch
*
* Get a pitch_decision for this row by voting among similar rows in the
* block, then similar rows over all the page, or any other rows at all.
**********************************************************************/
void fix_row_pitch(TO_ROW *bad_row, // row to fix
TO_BLOCK *bad_block, // block of bad_row
TO_BLOCK_LIST *blocks, // blocks to scan
int32_t row_target, // number of row
int32_t block_target) { // number of block
int16_t mid_cuts;
int block_votes; //votes in block
int like_votes; //votes over page
int other_votes; //votes of unlike blocks
int block_index; //number of block
int row_index; //number of row
int maxwidth; //max pitch
TO_BLOCK_IT block_it = blocks; //block iterator
TO_BLOCK *block; //current block
TO_ROW *row; //current row
float sp_sd; //space deviation
STATS block_stats; //pitches in block
STATS like_stats; //pitches in page
block_votes = like_votes = other_votes = 0;
maxwidth = static_cast<int32_t>(ceil (bad_row->xheight * textord_words_maxspace));
if (bad_row->pitch_decision != PITCH_DEF_FIXED
&& bad_row->pitch_decision != PITCH_DEF_PROP) {
block_stats.set_range (0, maxwidth);
like_stats.set_range (0, maxwidth);
block_index = 1;
for (block_it.mark_cycle_pt(); !block_it.cycled_list();
block_it.forward()) {
block = block_it.data();
POLY_BLOCK* pb = block->block->pdblk.poly_block();
if (pb != nullptr && !pb->IsText()) continue; // Non text doesn't exist!
row_index = 1;
TO_ROW_IT row_it(block->get_rows());
for (row_it.mark_cycle_pt (); !row_it.cycled_list ();
row_it.forward ()) {
row = row_it.data ();
if ((bad_row->all_caps
&& row->xheight + row->ascrise
<
(bad_row->xheight + bad_row->ascrise) * (1 +
textord_pitch_rowsimilarity)
&& row->xheight + row->ascrise >
(bad_row->xheight + bad_row->ascrise) * (1 -
textord_pitch_rowsimilarity))
|| (!bad_row->all_caps
&& row->xheight <
bad_row->xheight * (1 + textord_pitch_rowsimilarity)
&& row->xheight >
bad_row->xheight * (1 - textord_pitch_rowsimilarity))) {
if (block_index == block_target) {
if (row->pitch_decision == PITCH_DEF_FIXED) {
block_votes += textord_words_veto_power;
block_stats.add (static_cast<int32_t>(row->fixed_pitch),
textord_words_veto_power);
}
else if (row->pitch_decision == PITCH_MAYBE_FIXED
|| row->pitch_decision == PITCH_CORR_FIXED) {
block_votes++;
block_stats.add (static_cast<int32_t>(row->fixed_pitch), 1);
}
else if (row->pitch_decision == PITCH_DEF_PROP)
block_votes -= textord_words_veto_power;
else if (row->pitch_decision == PITCH_MAYBE_PROP
|| row->pitch_decision == PITCH_CORR_PROP)
block_votes--;
}
else {
if (row->pitch_decision == PITCH_DEF_FIXED) {
like_votes += textord_words_veto_power;
like_stats.add (static_cast<int32_t>(row->fixed_pitch),
textord_words_veto_power);
}
else if (row->pitch_decision == PITCH_MAYBE_FIXED
|| row->pitch_decision == PITCH_CORR_FIXED) {
like_votes++;
like_stats.add (static_cast<int32_t>(row->fixed_pitch), 1);
}
else if (row->pitch_decision == PITCH_DEF_PROP)
like_votes -= textord_words_veto_power;
else if (row->pitch_decision == PITCH_MAYBE_PROP
|| row->pitch_decision == PITCH_CORR_PROP)
like_votes--;
}
}
else {
if (row->pitch_decision == PITCH_DEF_FIXED)
other_votes += textord_words_veto_power;
else if (row->pitch_decision == PITCH_MAYBE_FIXED
|| row->pitch_decision == PITCH_CORR_FIXED)
other_votes++;
else if (row->pitch_decision == PITCH_DEF_PROP)
other_votes -= textord_words_veto_power;
else if (row->pitch_decision == PITCH_MAYBE_PROP
|| row->pitch_decision == PITCH_CORR_PROP)
other_votes--;
}
row_index++;
}
block_index++;
}
if (block_votes > textord_words_veto_power) {
bad_row->fixed_pitch = block_stats.ile (0.5);
bad_row->pitch_decision = PITCH_CORR_FIXED;
}
else if (block_votes <= textord_words_veto_power && like_votes > 0) {
bad_row->fixed_pitch = like_stats.ile (0.5);
bad_row->pitch_decision = PITCH_CORR_FIXED;
}
else {
bad_row->pitch_decision = PITCH_CORR_PROP;
if (block_votes == 0 && like_votes == 0 && other_votes > 0
&& (textord_debug_pitch_test || textord_debug_pitch_metric))
tprintf
("Warning:row %d of block %d set prop with no like rows against trend\n",
row_target, block_target);
}
}
if (textord_debug_pitch_metric) {
tprintf(":b_votes=%d:l_votes=%d:o_votes=%d",
block_votes, like_votes, other_votes);
tprintf("x=%g:asc=%g\n", bad_row->xheight, bad_row->ascrise);
}
if (bad_row->pitch_decision == PITCH_CORR_FIXED) {
if (bad_row->fixed_pitch < textord_min_xheight) {
if (block_votes > 0)
bad_row->fixed_pitch = block_stats.ile (0.5);
else if (block_votes == 0 && like_votes > 0)
bad_row->fixed_pitch = like_stats.ile (0.5);
else {
tprintf
("Warning:guessing pitch as xheight on row %d, block %d\n",
row_target, block_target);
bad_row->fixed_pitch = bad_row->xheight;
}
}
if (bad_row->fixed_pitch < textord_min_xheight)
bad_row->fixed_pitch = (float) textord_min_xheight;
bad_row->kern_size = bad_row->fixed_pitch / 4;
bad_row->min_space = static_cast<int32_t>(bad_row->fixed_pitch * 0.6);
bad_row->max_nonspace = static_cast<int32_t>(bad_row->fixed_pitch * 0.4);
bad_row->space_threshold =
(bad_row->min_space + bad_row->max_nonspace) / 2;
bad_row->space_size = bad_row->fixed_pitch;
if (bad_row->char_cells.empty() && !bad_row->blob_list()->empty()) {
tune_row_pitch (bad_row, &bad_row->projection,
bad_row->projection_left, bad_row->projection_right,
(bad_row->fixed_pitch +
bad_row->max_nonspace * 3) / 4, bad_row->fixed_pitch,
sp_sd, mid_cuts, &bad_row->char_cells, false);
}
}
else if (bad_row->pitch_decision == PITCH_CORR_PROP
|| bad_row->pitch_decision == PITCH_DEF_PROP) {
bad_row->fixed_pitch = 0.0f;
bad_row->char_cells.clear ();
}
}
/**********************************************************************
* compute_block_pitch
*
* Decide whether each block is fixed pitch individually.
**********************************************************************/
void compute_block_pitch(TO_BLOCK* block, // input list
FCOORD rotation, // for drawing
int32_t block_index, // block number
bool testing_on) { // correct orientation
TBOX block_box; //bounding box
block_box = block->block->pdblk.bounding_box ();
if (testing_on && textord_debug_pitch_test) {
tprintf ("Block %d at (%d,%d)->(%d,%d)\n",
block_index,
block_box.left (), block_box.bottom (),
block_box.right (), block_box.top ());
}
block->min_space = static_cast<int32_t>(floor (block->xheight
* textord_words_default_minspace));
block->max_nonspace = static_cast<int32_t>(ceil (block->xheight
* textord_words_default_nonspace));
block->fixed_pitch = 0.0f;
block->space_size = static_cast<float>(block->min_space);
block->kern_size = static_cast<float>(block->max_nonspace);
block->pr_nonsp = block->xheight * words_default_prop_nonspace;
block->pr_space = block->pr_nonsp * textord_spacesize_ratioprop;
if (!block->get_rows ()->empty ()) {
ASSERT_HOST (block->xheight > 0);
find_repeated_chars(block, textord_show_initial_words && testing_on);
#ifndef GRAPHICS_DISABLED
if (textord_show_initial_words && testing_on)
//overlap_picture_ops(true);
ScrollView::Update();
#endif
compute_rows_pitch(block,
block_index,
textord_debug_pitch_test && testing_on);
}
}
/**********************************************************************
* compute_rows_pitch
*
* Decide whether each row is fixed pitch individually.
**********************************************************************/
bool compute_rows_pitch( //find line stats
TO_BLOCK* block, //block to do
int32_t block_index, //block number
bool testing_on //correct orientation
) {
int32_t maxwidth; //of spaces
TO_ROW *row; //current row
int32_t row_index; //row number.
float lower, upper; //cluster thresholds
TO_ROW_IT row_it = block->get_rows ();
row_index = 1;
for (row_it.mark_cycle_pt (); !row_it.cycled_list (); row_it.forward ()) {
row = row_it.data ();
ASSERT_HOST (row->xheight > 0);
row->compute_vertical_projection ();
maxwidth = static_cast<int32_t>(ceil (row->xheight * textord_words_maxspace));
if (row_pitch_stats (row, maxwidth, testing_on)
&& find_row_pitch (row, maxwidth,
textord_dotmatrix_gap + 1, block, block_index,
row_index, testing_on)) {
if (row->fixed_pitch == 0) {
lower = row->pr_nonsp;
upper = row->pr_space;
row->space_size = upper;
row->kern_size = lower;
}
}
else {
row->fixed_pitch = 0.0f; //insufficient data
row->pitch_decision = PITCH_DUNNO;
}
row_index++;
}
return false;
}
/**********************************************************************
* try_doc_fixed
*
* Attempt to call the entire document fixed pitch.
**********************************************************************/
bool try_doc_fixed( //determine pitch
ICOORD page_tr, //top right
TO_BLOCK_LIST* port_blocks, //input list
float gradient //page skew
) {
int16_t master_x; //uniform shifts
int16_t pitch; //median pitch.
int x; //profile coord
int prop_blocks; //correct counts
int fixed_blocks;
int total_row_count; //total in page
//iterator
TO_BLOCK_IT block_it = port_blocks;
TO_BLOCK *block; //current block;
TO_ROW *row; //current row
int16_t projection_left; //edges
int16_t projection_right;
int16_t row_left; //edges of row
int16_t row_right;
ICOORDELT_LIST *master_cells; //cells for page
float master_y; //uniform shifts
float shift_factor; //page skew correction
float row_shift; //shift for row
float final_pitch; //output pitch
float row_y; //baseline
STATS projection; //entire page
STATS pitches (0, MAX_ALLOWED_PITCH);
//for median
float sp_sd; //space sd
int16_t mid_cuts; //no of cheap cuts
float pitch_sd; //sync rating
if (block_it.empty ()
// || block_it.data()==block_it.data_relative(1)
|| !textord_blockndoc_fixed)
return false;
shift_factor = gradient / (gradient * gradient + 1);
// row iterator
TO_ROW_IT row_it(block_it.data ()->get_rows());
master_x = row_it.data ()->projection_left;
master_y = row_it.data ()->baseline.y (master_x);
projection_left = INT16_MAX;
projection_right = -INT16_MAX;
prop_blocks = 0;
fixed_blocks = 0;
total_row_count = 0;
for (block_it.mark_cycle_pt (); !block_it.cycled_list ();
block_it.forward ()) {
block = block_it.data ();
row_it.set_to_list (block->get_rows ());
for (row_it.mark_cycle_pt (); !row_it.cycled_list (); row_it.forward ()) {
row = row_it.data ();
total_row_count++;
if (row->fixed_pitch > 0)
pitches.add (static_cast<int32_t>(row->fixed_pitch), 1);
//find median
row_y = row->baseline.y (master_x);
row_left =
static_cast<int16_t>(row->projection_left -
shift_factor * (master_y - row_y));
row_right =
static_cast<int16_t>(row->projection_right -
shift_factor * (master_y - row_y));
if (row_left < projection_left)
projection_left = row_left;
if (row_right > projection_right)
projection_right = row_right;
}
}
if (pitches.get_total () == 0)
return false;
projection.set_range (projection_left, projection_right);
for (block_it.mark_cycle_pt (); !block_it.cycled_list ();
block_it.forward ()) {
block = block_it.data ();
row_it.set_to_list (block->get_rows ());
for (row_it.mark_cycle_pt (); !row_it.cycled_list (); row_it.forward ()) {
row = row_it.data ();
row_y = row->baseline.y (master_x);
row_left =
static_cast<int16_t>(row->projection_left -
shift_factor * (master_y - row_y));
for (x = row->projection_left; x < row->projection_right;
x++, row_left++) {
projection.add (row_left, row->projection.pile_count (x));
}
}
}
row_it.set_to_list (block_it.data ()->get_rows ());
row = row_it.data ();
#ifndef GRAPHICS_DISABLED
if (textord_show_page_cuts && to_win != nullptr)
projection.plot (to_win, projection_left,
row->intercept (), 1.0f, -1.0f, ScrollView::CORAL);
#endif
final_pitch = pitches.ile (0.5);
pitch = static_cast<int16_t>(final_pitch);
pitch_sd =
tune_row_pitch (row, &projection, projection_left, projection_right,
pitch * 0.75, final_pitch, sp_sd, mid_cuts,
&row->char_cells, false);
if (textord_debug_pitch_metric)
tprintf
("try_doc:props=%d:fixed=%d:pitch=%d:final_pitch=%g:pitch_sd=%g:sp_sd=%g:sd/trc=%g:sd/p=%g:sd/trc/p=%g\n",
prop_blocks, fixed_blocks, pitch, final_pitch, pitch_sd, sp_sd,
pitch_sd / total_row_count, pitch_sd / pitch,
pitch_sd / total_row_count / pitch);
#ifndef GRAPHICS_DISABLED
if (textord_show_page_cuts && to_win != nullptr) {
master_cells = &row->char_cells;
for (block_it.mark_cycle_pt (); !block_it.cycled_list ();
block_it.forward ()) {
block = block_it.data ();
row_it.set_to_list (block->get_rows ());
for (row_it.mark_cycle_pt (); !row_it.cycled_list ();
row_it.forward ()) {
row = row_it.data ();
row_y = row->baseline.y (master_x);
row_shift = shift_factor * (master_y - row_y);
plot_row_cells(to_win, ScrollView::GOLDENROD, row, row_shift, master_cells);
}
}
}
#endif
row->char_cells.clear ();
return false;
}
/**********************************************************************
* try_block_fixed
*
* Try to call the entire block fixed.
**********************************************************************/
bool try_block_fixed( //find line stats
TO_BLOCK* block, //block to do
int32_t block_index //block number
) {
return false;
}
/**********************************************************************
* try_rows_fixed
*
* Decide whether each row is fixed pitch individually.
**********************************************************************/
bool try_rows_fixed( //find line stats
TO_BLOCK* block, //block to do
int32_t block_index, //block number
bool testing_on //correct orientation
) {
TO_ROW *row; //current row
int32_t row_index; //row number.
int32_t def_fixed = 0; //counters
int32_t def_prop = 0;
int32_t maybe_fixed = 0;
int32_t maybe_prop = 0;
int32_t dunno = 0;
int32_t corr_fixed = 0;
int32_t corr_prop = 0;
float lower, upper; //cluster thresholds
TO_ROW_IT row_it = block->get_rows ();
row_index = 1;
for (row_it.mark_cycle_pt (); !row_it.cycled_list (); row_it.forward ()) {
row = row_it.data ();
ASSERT_HOST (row->xheight > 0);
if (row->fixed_pitch > 0 &&
fixed_pitch_row(row, block->block, block_index)) {
if (row->fixed_pitch == 0) {
lower = row->pr_nonsp;
upper = row->pr_space;
row->space_size = upper;
row->kern_size = lower;
}
}
row_index++;
}
count_block_votes(block,
def_fixed,
def_prop,
maybe_fixed,
maybe_prop,
corr_fixed,
corr_prop,
dunno);
if (testing_on
&& (textord_debug_pitch_test
|| textord_blocksall_prop || textord_blocksall_fixed)) {
tprintf ("Initially:");
print_block_counts(block, block_index);
}
if (def_fixed > def_prop * textord_words_veto_power)
block->pitch_decision = PITCH_DEF_FIXED;
else if (def_prop > def_fixed * textord_words_veto_power)
block->pitch_decision = PITCH_DEF_PROP;
else if (def_fixed > 0 || def_prop > 0)
block->pitch_decision = PITCH_DUNNO;
else if (maybe_fixed > maybe_prop * textord_words_veto_power)
block->pitch_decision = PITCH_MAYBE_FIXED;
else if (maybe_prop > maybe_fixed * textord_words_veto_power)
block->pitch_decision = PITCH_MAYBE_PROP;
else
block->pitch_decision = PITCH_DUNNO;
return false;
}
/**********************************************************************
* print_block_counts
*
* Count up how many rows have what decision and print the results.
**********************************************************************/
void print_block_counts( //find line stats
TO_BLOCK *block, //block to do
int32_t block_index //block number
) {
int32_t def_fixed = 0; //counters
int32_t def_prop = 0;
int32_t maybe_fixed = 0;
int32_t maybe_prop = 0;
int32_t dunno = 0;
int32_t corr_fixed = 0;
int32_t corr_prop = 0;
count_block_votes(block,
def_fixed,
def_prop,
maybe_fixed,
maybe_prop,
corr_fixed,
corr_prop,
dunno);
tprintf ("Block %d has (%d,%d,%d)",
block_index, def_fixed, maybe_fixed, corr_fixed);
if (textord_blocksall_prop && (def_fixed || maybe_fixed || corr_fixed))
tprintf (" (Wrongly)");
tprintf (" fixed, (%d,%d,%d)", def_prop, maybe_prop, corr_prop);
if (textord_blocksall_fixed && (def_prop || maybe_prop || corr_prop))
tprintf (" (Wrongly)");
tprintf (" prop, %d dunno\n", dunno);
}
/**********************************************************************
* count_block_votes
*
* Count the number of rows in the block with each kind of pitch_decision.
**********************************************************************/
void count_block_votes( //find line stats
TO_BLOCK *block, //block to do
int32_t &def_fixed, //add to counts
int32_t &def_prop,
int32_t &maybe_fixed,
int32_t &maybe_prop,
int32_t &corr_fixed,
int32_t &corr_prop,
int32_t &dunno) {
TO_ROW *row; //current row
TO_ROW_IT row_it = block->get_rows ();
for (row_it.mark_cycle_pt (); !row_it.cycled_list (); row_it.forward ()) {
row = row_it.data ();
switch (row->pitch_decision) {
case PITCH_DUNNO:
dunno++;
break;
case PITCH_DEF_PROP:
def_prop++;
break;
case PITCH_MAYBE_PROP:
maybe_prop++;
break;
case PITCH_DEF_FIXED:
def_fixed++;
break;
case PITCH_MAYBE_FIXED:
maybe_fixed++;
break;
case PITCH_CORR_PROP:
corr_prop++;
break;
case PITCH_CORR_FIXED:
corr_fixed++;
break;
}
}
}
/**********************************************************************
* row_pitch_stats
*
* Decide whether each row is fixed pitch individually.
**********************************************************************/
bool row_pitch_stats( //find line stats
TO_ROW* row, //current row
int32_t maxwidth, //of spaces
bool testing_on //correct orientation
) {
BLOBNBOX *blob; //current blob
int gap_index; //current gap
int32_t prev_x; //end of prev blob
int32_t cluster_count; //no of clusters
int32_t prev_count; //of clusters
int32_t smooth_factor; //for smoothing stats
TBOX blob_box; //bounding box
float lower, upper; //cluster thresholds
//gap sizes
float gaps[BLOCK_STATS_CLUSTERS];
//blobs
BLOBNBOX_IT blob_it = row->blob_list ();
STATS gap_stats (0, maxwidth);
STATS cluster_stats[BLOCK_STATS_CLUSTERS + 1];
//clusters
smooth_factor =
static_cast<int32_t>(row->xheight * textord_wordstats_smooth_factor + 1.5);
if (!blob_it.empty ()) {
prev_x = blob_it.data ()->bounding_box ().right ();
blob_it.forward ();
while (!blob_it.at_first ()) {
blob = blob_it.data ();
if (!blob->joined_to_prev ()) {
blob_box = blob->bounding_box ();
if (blob_box.left () - prev_x < maxwidth)
gap_stats.add (blob_box.left () - prev_x, 1);
prev_x = blob_box.right ();
}
blob_it.forward ();
}
}
if (gap_stats.get_total () == 0) {
return false;
}
cluster_count = 0;
lower = row->xheight * words_initial_lower;
upper = row->xheight * words_initial_upper;
gap_stats.smooth (smooth_factor);
do {
prev_count = cluster_count;
cluster_count = gap_stats.cluster (lower, upper,
textord_spacesize_ratioprop,
BLOCK_STATS_CLUSTERS, cluster_stats);
}
while (cluster_count > prev_count && cluster_count < BLOCK_STATS_CLUSTERS);
if (cluster_count < 1) {
return false;
}
for (gap_index = 0; gap_index < cluster_count; gap_index++)
gaps[gap_index] = cluster_stats[gap_index + 1].ile (0.5);
//get medians
if (testing_on) {
tprintf ("cluster_count=%d:", cluster_count);
for (gap_index = 0; gap_index < cluster_count; gap_index++)
tprintf (" %g(%d)", gaps[gap_index],
cluster_stats[gap_index + 1].get_total ());
tprintf ("\n");
}
qsort (gaps, cluster_count, sizeof (float), sort_floats);
//Try to find proportional non-space and space for row.
lower = row->xheight * words_default_prop_nonspace;
upper = row->xheight * textord_words_min_minspace;
for (gap_index = 0; gap_index < cluster_count
&& gaps[gap_index] < lower; gap_index++);
if (gap_index == 0) {
if (testing_on)
tprintf ("No clusters below nonspace threshold!!\n");
if (cluster_count > 1) {
row->pr_nonsp = gaps[0];
row->pr_space = gaps[1];
}
else {
row->pr_nonsp = lower;
row->pr_space = gaps[0];
}
}
else {
row->pr_nonsp = gaps[gap_index - 1];
while (gap_index < cluster_count && gaps[gap_index] < upper)
gap_index++;
if (gap_index == cluster_count) {
if (testing_on)
tprintf ("No clusters above nonspace threshold!!\n");
row->pr_space = lower * textord_spacesize_ratioprop;
}
else
row->pr_space = gaps[gap_index];
}
//Now try to find the fixed pitch space and non-space.
upper = row->xheight * words_default_fixed_space;
for (gap_index = 0; gap_index < cluster_count
&& gaps[gap_index] < upper; gap_index++);
if (gap_index == 0) {
if (testing_on)
tprintf ("No clusters below space threshold!!\n");
row->fp_nonsp = upper;
row->fp_space = gaps[0];
}
else {
row->fp_nonsp = gaps[gap_index - 1];
if (gap_index == cluster_count) {
if (testing_on)
tprintf ("No clusters above space threshold!!\n");
row->fp_space = row->xheight;
}
else
row->fp_space = gaps[gap_index];
}
if (testing_on) {
tprintf
("Initial estimates:pr_nonsp=%g, pr_space=%g, fp_nonsp=%g, fp_space=%g\n",
row->pr_nonsp, row->pr_space, row->fp_nonsp, row->fp_space);
}
return true; //computed some stats
}
/**********************************************************************
* find_row_pitch
*
* Check to see if this row could be fixed pitch using the given spacings.
* Blobs with gaps smaller than the lower threshold are assumed to be one.
* The larger threshold is the word gap threshold.
**********************************************************************/
bool find_row_pitch( //find lines
TO_ROW* row, //row to do
int32_t maxwidth, //max permitted space
int32_t dm_gap, //ignorable gaps
TO_BLOCK* block, //block of row
int32_t block_index, //block_number
int32_t row_index, //number of row
bool testing_on //correct orientation
) {
bool used_dm_model; //looks like dot matrix
float min_space; //estimate threshold
float non_space; //gap size
float gap_iqr; //interquartile range
float pitch_iqr;
float dm_gap_iqr; //interquartile range
float dm_pitch_iqr;
float dm_pitch; //pitch with dm on
float pitch; //revised estimate
float initial_pitch; //guess at pitch
STATS gap_stats (0, maxwidth);
//centre-centre
STATS pitch_stats (0, maxwidth);
row->fixed_pitch = 0.0f;
initial_pitch = row->fp_space;
if (initial_pitch > row->xheight * (1 + words_default_fixed_limit))
initial_pitch = row->xheight;//keep pitch decent
non_space = row->fp_nonsp;
if (non_space > initial_pitch)
non_space = initial_pitch;
min_space = (initial_pitch + non_space) / 2;
if (!count_pitch_stats (row, &gap_stats, &pitch_stats,
initial_pitch, min_space, true, false, dm_gap)) {
dm_gap_iqr = 0.0001;
dm_pitch_iqr = maxwidth * 2.0f;
dm_pitch = initial_pitch;
}
else {
dm_gap_iqr = gap_stats.ile (0.75) - gap_stats.ile (0.25);
dm_pitch_iqr = pitch_stats.ile (0.75) - pitch_stats.ile (0.25);
dm_pitch = pitch_stats.ile (0.5);
}
gap_stats.clear ();
pitch_stats.clear ();
if (!count_pitch_stats (row, &gap_stats, &pitch_stats,
initial_pitch, min_space, true, false, 0)) {
gap_iqr = 0.0001;
pitch_iqr = maxwidth * 3.0f;
}
else {
gap_iqr = gap_stats.ile (0.75) - gap_stats.ile (0.25);
pitch_iqr = pitch_stats.ile (0.75) - pitch_stats.ile (0.25);
if (testing_on)
tprintf
("First fp iteration:initial_pitch=%g, gap_iqr=%g, pitch_iqr=%g, pitch=%g\n",
initial_pitch, gap_iqr, pitch_iqr, pitch_stats.ile (0.5));
initial_pitch = pitch_stats.ile (0.5);
if (min_space > initial_pitch
&& count_pitch_stats (row, &gap_stats, &pitch_stats,
initial_pitch, initial_pitch, true, false, 0)) {
min_space = initial_pitch;
gap_iqr = gap_stats.ile (0.75) - gap_stats.ile (0.25);
pitch_iqr = pitch_stats.ile (0.75) - pitch_stats.ile (0.25);
if (testing_on)
tprintf
("Revised fp iteration:initial_pitch=%g, gap_iqr=%g, pitch_iqr=%g, pitch=%g\n",
initial_pitch, gap_iqr, pitch_iqr, pitch_stats.ile (0.5));
initial_pitch = pitch_stats.ile (0.5);
}
}
if (textord_debug_pitch_metric)
tprintf("Blk=%d:Row=%d:%c:p_iqr=%g:g_iqr=%g:dm_p_iqr=%g:dm_g_iqr=%g:%c:",
block_index, row_index, 'X',
pitch_iqr, gap_iqr, dm_pitch_iqr, dm_gap_iqr,
pitch_iqr > maxwidth && dm_pitch_iqr > maxwidth ? 'D' :
(pitch_iqr * dm_gap_iqr <= dm_pitch_iqr * gap_iqr ? 'S' : 'M'));
if (pitch_iqr > maxwidth && dm_pitch_iqr > maxwidth) {
row->pitch_decision = PITCH_DUNNO;
if (textord_debug_pitch_metric)
tprintf ("\n");
return false; //insufficient data
}
if (pitch_iqr * dm_gap_iqr <= dm_pitch_iqr * gap_iqr) {
if (testing_on)
tprintf
("Choosing non dm version:pitch_iqr=%g, gap_iqr=%g, dm_pitch_iqr=%g, dm_gap_iqr=%g\n",
pitch_iqr, gap_iqr, dm_pitch_iqr, dm_gap_iqr);
gap_iqr = gap_stats.ile (0.75) - gap_stats.ile (0.25);
pitch_iqr = pitch_stats.ile (0.75) - pitch_stats.ile (0.25);
pitch = pitch_stats.ile (0.5);
used_dm_model = false;
}
else {
if (testing_on)
tprintf
("Choosing dm version:pitch_iqr=%g, gap_iqr=%g, dm_pitch_iqr=%g, dm_gap_iqr=%g\n",
pitch_iqr, gap_iqr, dm_pitch_iqr, dm_gap_iqr);
gap_iqr = dm_gap_iqr;
pitch_iqr = dm_pitch_iqr;
pitch = dm_pitch;
used_dm_model = true;
}
if (textord_debug_pitch_metric) {
tprintf ("rev_p_iqr=%g:rev_g_iqr=%g:pitch=%g:",
pitch_iqr, gap_iqr, pitch);
tprintf ("p_iqr/g=%g:p_iqr/x=%g:iqr_res=%c:",
pitch_iqr / gap_iqr, pitch_iqr / block->xheight,
pitch_iqr < gap_iqr * textord_fpiqr_ratio
&& pitch_iqr < block->xheight * textord_max_pitch_iqr
&& pitch < block->xheight * textord_words_default_maxspace
? 'F' : 'P');
}
if (pitch_iqr < gap_iqr * textord_fpiqr_ratio
&& pitch_iqr < block->xheight * textord_max_pitch_iqr
&& pitch < block->xheight * textord_words_default_maxspace)
row->pitch_decision = PITCH_MAYBE_FIXED;
else
row->pitch_decision = PITCH_MAYBE_PROP;
row->fixed_pitch = pitch;
row->kern_size = gap_stats.ile (0.5);
row->min_space = static_cast<int32_t>(row->fixed_pitch + non_space) / 2;
if (row->min_space > row->fixed_pitch)
row->min_space = static_cast<int32_t>(row->fixed_pitch);
row->max_nonspace = row->min_space;
row->space_size = row->fixed_pitch;
row->space_threshold = (row->max_nonspace + row->min_space) / 2;
row->used_dm_model = used_dm_model;
return true;
}
/**********************************************************************
* fixed_pitch_row
*
* Check to see if this row could be fixed pitch using the given spacings.
* Blobs with gaps smaller than the lower threshold are assumed to be one.
* The larger threshold is the word gap threshold.
**********************************************************************/
bool fixed_pitch_row(TO_ROW* row, // row to do
BLOCK* block,
int32_t block_index // block_number
) {
const char *res_string; // pitch result
int16_t mid_cuts; // no of cheap cuts
float non_space; // gap size
float pitch_sd; // error on pitch
float sp_sd = 0.0f; // space sd
non_space = row->fp_nonsp;
if (non_space > row->fixed_pitch)
non_space = row->fixed_pitch;
POLY_BLOCK* pb = block != nullptr ? block->pdblk.poly_block() : nullptr;
if (textord_all_prop || (pb != nullptr && !pb->IsText())) {
// Set the decision to definitely proportional.
pitch_sd = textord_words_def_prop * row->fixed_pitch;
row->pitch_decision = PITCH_DEF_PROP;
} else {
pitch_sd = tune_row_pitch (row, &row->projection, row->projection_left,
row->projection_right,