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git-svn-id: https://tesseract-ocr.googlecode.com/svn/trunk@974 d0cd1f9f-072b-0410-8dd7-cf729c803f20
288 lines
14 KiB
C
288 lines
14 KiB
C
/**********************************************************************
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* File: makerow.h (Formerly makerows.h)
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* Description: Code to arrange blobs into rows of text.
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* Author: Ray Smith
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* Created: Mon Sep 21 14:34:48 BST 1992
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*
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* (C) Copyright 1992, Hewlett-Packard Ltd.
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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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#ifndef MAKEROW_H
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#define MAKEROW_H
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#include "params.h"
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#include "ocrblock.h"
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#include "blobs.h"
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#include "blobbox.h"
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#include "statistc.h"
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enum OVERLAP_STATE
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{
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ASSIGN, //assign it to row
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REJECT, //reject it - dual overlap
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NEW_ROW
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};
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enum ROW_CATEGORY {
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ROW_ASCENDERS_FOUND,
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ROW_DESCENDERS_FOUND,
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ROW_UNKNOWN,
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ROW_INVALID,
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};
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extern BOOL_VAR_H(textord_heavy_nr, FALSE, "Vigorously remove noise");
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extern BOOL_VAR_H (textord_show_initial_rows, FALSE,
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"Display row accumulation");
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extern BOOL_VAR_H (textord_show_parallel_rows, FALSE,
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"Display page correlated rows");
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extern BOOL_VAR_H (textord_show_expanded_rows, FALSE,
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"Display rows after expanding");
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extern BOOL_VAR_H (textord_show_final_rows, FALSE,
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"Display rows after final fitting");
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extern BOOL_VAR_H (textord_show_final_blobs, FALSE,
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"Display blob bounds after pre-ass");
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extern BOOL_VAR_H (textord_test_landscape, FALSE, "Tests refer to land/port");
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extern BOOL_VAR_H (textord_parallel_baselines, TRUE,
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"Force parallel baselines");
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extern BOOL_VAR_H (textord_straight_baselines, FALSE,
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"Force straight baselines");
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extern BOOL_VAR_H (textord_quadratic_baselines, FALSE,
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"Use quadratic splines");
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extern BOOL_VAR_H (textord_old_baselines, TRUE, "Use old baseline algorithm");
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extern BOOL_VAR_H (textord_old_xheight, TRUE, "Use old xheight algorithm");
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extern BOOL_VAR_H (textord_fix_xheight_bug, TRUE, "Use spline baseline");
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extern BOOL_VAR_H (textord_fix_makerow_bug, TRUE,
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"Prevent multiple baselines");
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extern BOOL_VAR_H (textord_cblob_blockocc, TRUE,
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"Use new projection for underlines");
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extern BOOL_VAR_H (textord_debug_xheights, FALSE, "Test xheight algorithms");
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extern INT_VAR_H (textord_test_x, -MAX_INT32, "coord of test pt");
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extern INT_VAR_H (textord_test_y, -MAX_INT32, "coord of test pt");
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extern INT_VAR_H (textord_min_blobs_in_row, 4,
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"Min blobs before gradient counted");
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extern INT_VAR_H (textord_spline_minblobs, 8,
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"Min blobs in each spline segment");
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extern INT_VAR_H (textord_spline_medianwin, 6,
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"Size of window for spline segmentation");
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extern INT_VAR_H (textord_min_xheight, 10, "Min credible pixel xheight");
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extern double_VAR_H (textord_spline_shift_fraction, 0.02,
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"Fraction of line spacing for quad");
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extern double_VAR_H (textord_spline_outlier_fraction, 0.1,
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"Fraction of line spacing for outlier");
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extern double_VAR_H (textord_skew_ile, 0.5, "Ile of gradients for page skew");
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extern double_VAR_H (textord_skew_lag, 0.75,
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"Lag for skew on row accumulation");
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extern double_VAR_H (textord_linespace_iqrlimit, 0.2,
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"Max iqr/median for linespace");
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extern double_VAR_H (textord_width_limit, 8,
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"Max width of blobs to make rows");
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extern double_VAR_H (textord_chop_width, 1.5, "Max width before chopping");
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extern double_VAR_H (textord_minxh, 0.25,
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"fraction of linesize for min xheight");
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extern double_VAR_H (textord_min_linesize, 1.25,
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"* blob height for initial linesize");
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extern double_VAR_H (textord_excess_blobsize, 1.3,
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"New row made if blob makes row this big");
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extern double_VAR_H (textord_occupancy_threshold, 0.4,
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"Fraction of neighbourhood");
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extern double_VAR_H (textord_underline_width, 2.0,
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"Multiple of line_size for underline");
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extern double_VAR_H(textord_min_blob_height_fraction, 0.75,
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"Min blob height/top to include blob top into xheight stats");
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extern double_VAR_H (textord_xheight_mode_fraction, 0.4,
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"Min pile height to make xheight");
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extern double_VAR_H (textord_ascheight_mode_fraction, 0.15,
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"Min pile height to make ascheight");
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extern double_VAR_H (textord_ascx_ratio_min, 1.2, "Min cap/xheight");
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extern double_VAR_H (textord_ascx_ratio_max, 1.7, "Max cap/xheight");
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extern double_VAR_H (textord_descx_ratio_min, 0.15, "Min desc/xheight");
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extern double_VAR_H (textord_descx_ratio_max, 0.6, "Max desc/xheight");
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extern double_VAR_H (textord_xheight_error_margin, 0.1, "Accepted variation");
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extern INT_VAR_H (textord_lms_line_trials, 12, "Number of linew fits to do");
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extern BOOL_VAR_H (textord_new_initial_xheight, TRUE,
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"Use test xheight mechanism");
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extern BOOL_VAR_H(textord_debug_blob, FALSE, "Print test blob information");
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inline void get_min_max_xheight(int block_linesize,
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int *min_height, int *max_height) {
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*min_height = static_cast<inT32>(floor(block_linesize * textord_minxh));
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if (*min_height < textord_min_xheight) *min_height = textord_min_xheight;
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*max_height = static_cast<inT32>(ceil(block_linesize * 3.0));
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}
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inline ROW_CATEGORY get_row_category(const TO_ROW *row) {
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if (row->xheight <= 0) return ROW_INVALID;
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return (row->ascrise > 0) ? ROW_ASCENDERS_FOUND :
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(row->descdrop != 0) ? ROW_DESCENDERS_FOUND : ROW_UNKNOWN;
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}
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inline bool within_error_margin(float test, float num, float margin) {
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return (test >= num * (1 - margin) && test <= num * (1 + margin));
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}
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void fill_heights(TO_ROW *row, float gradient, int min_height,
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int max_height, STATS *heights, STATS *floating_heights);
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float make_single_row(ICOORD page_tr, TO_BLOCK* block,
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TO_BLOCK_LIST* blocks);
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float make_rows(ICOORD page_tr, // top right
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TO_BLOCK_LIST *port_blocks);
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void make_initial_textrows(ICOORD page_tr,
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TO_BLOCK *block, // block to do
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FCOORD rotation, // for drawing
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BOOL8 testing_on); // correct orientation
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void fit_lms_line(TO_ROW *row);
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void compute_page_skew(TO_BLOCK_LIST *blocks, // list of blocks
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float &page_m, // average gradient
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float &page_err); // average error
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void vigorous_noise_removal(TO_BLOCK* block);
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void cleanup_rows_making(ICOORD page_tr, // top right
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TO_BLOCK *block, // block to do
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float gradient, // gradient to fit
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FCOORD rotation, // for drawing
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inT32 block_edge, // edge of block
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BOOL8 testing_on); // correct orientation
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void delete_non_dropout_rows( //find lines
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TO_BLOCK *block, //block to do
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float gradient, //global skew
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FCOORD rotation, //deskew vector
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inT32 block_edge, //left edge
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BOOL8 testing_on //correct orientation
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);
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BOOL8 find_best_dropout_row( //find neighbours
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TO_ROW *row, //row to test
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inT32 distance, //dropout dist
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float dist_limit, //threshold distance
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inT32 line_index, //index of row
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TO_ROW_IT *row_it, //current position
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BOOL8 testing_on //correct orientation
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);
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TBOX deskew_block_coords( //block box
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TO_BLOCK *block, //block to do
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float gradient //global skew
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);
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void compute_line_occupation( //project blobs
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TO_BLOCK *block, //block to do
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float gradient, //global skew
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inT32 min_y, //min coord in block
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inT32 max_y, //in block
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inT32 *occupation, //output projection
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inT32 *deltas //derivative
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);
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void compute_occupation_threshold( //project blobs
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inT32 low_window, //below result point
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inT32 high_window, //above result point
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inT32 line_count, //array sizes
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inT32 *occupation, //input projection
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inT32 *thresholds //output thresholds
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);
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void compute_dropout_distances( //project blobs
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inT32 *occupation, //input projection
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inT32 *thresholds, //output thresholds
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inT32 line_count //array sizes
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);
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void expand_rows( //find lines
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ICOORD page_tr, //top right
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TO_BLOCK *block, //block to do
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float gradient, //gradient to fit
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FCOORD rotation, //for drawing
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inT32 block_edge, //edge of block
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BOOL8 testing_on //correct orientation
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);
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void adjust_row_limits( //tidy limits
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TO_BLOCK *block //block to do
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);
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void compute_row_stats( //find lines
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TO_BLOCK *block, //block to do
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BOOL8 testing_on //correct orientation
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);
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float median_block_xheight( //find lines
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TO_BLOCK *block, //block to do
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float gradient //global skew
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);
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int compute_xheight_from_modes(
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STATS *heights, STATS *floating_heights, bool cap_only, int min_height,
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int max_height, float *xheight, float *ascrise);
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inT32 compute_row_descdrop(TO_ROW *row, // row to do
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float gradient, // global skew
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int xheight_blob_count,
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STATS *heights);
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inT32 compute_height_modes(STATS *heights, // stats to search
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inT32 min_height, // bottom of range
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inT32 max_height, // top of range
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inT32 *modes, // output array
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inT32 maxmodes); // size of modes
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void correct_row_xheight(TO_ROW *row, // row to fix
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float xheight, // average values
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float ascrise,
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float descdrop);
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void separate_underlines(TO_BLOCK *block, // block to do
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float gradient, // skew angle
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FCOORD rotation, // inverse landscape
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BOOL8 testing_on); // correct orientation
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void pre_associate_blobs( ICOORD page_tr, // top right
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TO_BLOCK *block, // block to do
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FCOORD rotation, // inverse landscape
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BOOL8 testing_on); // correct orientation
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void fit_parallel_rows(TO_BLOCK *block, // block to do
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float gradient, // gradient to fit
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FCOORD rotation, // for drawing
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inT32 block_edge, // edge of block
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BOOL8 testing_on); // correct orientation
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void fit_parallel_lms(float gradient, // forced gradient
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TO_ROW *row); // row to fit
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void make_baseline_spline(TO_ROW *row, // row to fit
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TO_BLOCK *block); // block it came from
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BOOL8 segment_baseline ( //split baseline
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TO_ROW * row, //row to fit
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TO_BLOCK * block, //block it came from
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inT32 & segments, //no fo segments
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inT32 xstarts[] //coords of segments
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);
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double *linear_spline_baseline ( //split baseline
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TO_ROW * row, //row to fit
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TO_BLOCK * block, //block it came from
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inT32 & segments, //no fo segments
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inT32 xstarts[] //coords of segments
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);
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void assign_blobs_to_rows( //find lines
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TO_BLOCK *block, //block to do
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float *gradient, //block skew
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int pass, //identification
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BOOL8 reject_misses, //chuck big ones out
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BOOL8 make_new_rows, //add rows for unmatched
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BOOL8 drawing_skew //draw smoothed skew
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);
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//find best row
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OVERLAP_STATE most_overlapping_row(TO_ROW_IT *row_it, //iterator
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TO_ROW *&best_row, //output row
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float top, //top of blob
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float bottom, //bottom of blob
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float rowsize, //max row size
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BOOL8 testing_blob //test stuff
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);
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int blob_x_order( //sort function
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const void *item1, //items to compare
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const void *item2);
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int row_y_order( //sort function
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const void *item1, //items to compare
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const void *item2);
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int row_spacing_order( //sort function
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const void *item1, //items to compare
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const void *item2);
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void mark_repeated_chars(TO_ROW *row);
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#endif
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