topitch.h

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/**********************************************************************
 * File:        topitch.h  (Formerly to_pitch.h)
 * 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.
 *
 **********************************************************************/
 
#ifndef TOPITCH_H
#define TOPITCH_H
 
#include "blobbox.h"
 
namespace tesseract {
 
class Tesseract;
 
extern BOOL_VAR_H(textord_debug_pitch_test);
extern BOOL_VAR_H(textord_debug_pitch_metric);
extern BOOL_VAR_H(textord_show_row_cuts);
extern BOOL_VAR_H(textord_show_page_cuts);
extern BOOL_VAR_H(textord_blockndoc_fixed);
extern BOOL_VAR_H(textord_fast_pitch_test);
extern double_VAR_H(textord_projection_scale);
extern double_VAR_H(textord_balance_factor);
 
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
void fix_row_pitch(                                  // get some value
    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
);
void compute_block_pitch(TO_BLOCK *block,     // input list
                         FCOORD rotation,     // for drawing
                         int32_t block_index, // block number
                         bool testing_on);    // correct orientation
bool compute_rows_pitch(                      // find line stats
    TO_BLOCK *block,                          // block to do
    int32_t block_index,                      // block number
    bool testing_on                           // correct orientation
);
bool try_doc_fixed(             // determine pitch
    ICOORD page_tr,             // top right
    TO_BLOCK_LIST *port_blocks, // input list
    float gradient              // page skew
);
bool try_block_fixed(   // find line stats
    TO_BLOCK *block,    // block to do
    int32_t block_index // block number
);
bool try_rows_fixed(     // find line stats
    TO_BLOCK *block,     // block to do
    int32_t block_index, // block number
    bool testing_on      // correct orientation
);
void print_block_counts( // find line stats
    TO_BLOCK *block,     // block to do
    int32_t block_index  // block number
);
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);
bool row_pitch_stats( // find line stats
    TO_ROW *row,      // current row
    int32_t maxwidth, // of spaces
    bool testing_on   // correct orientation
);
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 fixed_pitch_row( // find lines
    TO_ROW *row,      // row to do
    BLOCK *block,
    int32_t block_index // block_number
);
bool count_pitch_stats(  // find lines
    TO_ROW *row,         // row to do
    STATS *gap_stats,    // blob gaps
    STATS *pitch_stats,  // centre-centre stats
    float initial_pitch, // guess at pitch
    float min_space,     // estimate space size
    bool ignore_outsize, // discard big objects
    bool split_outsize,  // split big objects
    int32_t dm_gap       // ignorable gaps
);
float tune_row_pitch(           // find fp cells
    TO_ROW *row,                // row to do
    STATS *projection,          // vertical projection
    int16_t projection_left,    // edge of projection
    int16_t projection_right,   // edge of projection
    float space_size,           // size of blank
    float &initial_pitch,       // guess at pitch
    float &best_sp_sd,          // space sd
    int16_t &best_mid_cuts,     // no of cheap cuts
    ICOORDELT_LIST *best_cells, // row cells
    bool testing_on             // individual words
);
float tune_row_pitch2(          // find fp cells
    TO_ROW *row,                // row to do
    STATS *projection,          // vertical projection
    int16_t projection_left,    // edge of projection
    int16_t projection_right,   // edge of projection
    float space_size,           // size of blank
    float &initial_pitch,       // guess at pitch
    float &best_sp_sd,          // space sd
    int16_t &best_mid_cuts,     // no of cheap cuts
    ICOORDELT_LIST *best_cells, // row cells
    bool testing_on             // individual words
);
float compute_pitch_sd(        // find fp cells
    TO_ROW *row,               // row to do
    STATS *projection,         // vertical projection
    int16_t projection_left,   // edge
    int16_t projection_right,  // edge
    float space_size,          // size of blank
    float initial_pitch,       // guess at pitch
    float &sp_sd,              // space sd
    int16_t &mid_cuts,         // no of free cuts
    ICOORDELT_LIST *row_cells, // list of chop pts
    bool testing_on,           // individual words
    int16_t start = 0,         // start of good range
    int16_t end = 0            // end of good range
);
float compute_pitch_sd2(       // find fp cells
    TO_ROW *row,               // row to do
    STATS *projection,         // vertical projection
    int16_t projection_left,   // edge
    int16_t projection_right,  // edge
    float initial_pitch,       // guess at pitch
    int16_t &occupation,       // no of occupied cells
    int16_t &mid_cuts,         // no of free cuts
    ICOORDELT_LIST *row_cells, // list of chop pts
    bool testing_on,           // individual words
    int16_t start = 0,         // start of good range
    int16_t end = 0            // end of good range
);
void print_pitch_sd(         // find fp cells
    TO_ROW *row,             // row to do
    STATS *projection,       // vertical projection
    int16_t projection_left, // edges //size of blank
    int16_t projection_right, float space_size,
    float initial_pitch // guess at pitch
);
void find_repeated_chars(TO_BLOCK *block,  // Block to search.
                         bool testing_on); // Debug mode.
void plot_fp_word(                         // draw block of words
    TO_BLOCK *block,                       // block to draw
    float pitch,                           // pitch to draw with
    float nonspace                         // for space threshold
);
 
} // namespace tesseract
 
#endif