tesseract-ocr/ccstruct/ocrblock.h

Go to the documentation of this file.

/**********************************************************************
 * File:        ocrblock.h  (Formerly block.h)
 * Description: Page block class definition.
 * Author:              Ray Smith
 * Created:             Thu Mar 14 17:32:01 GMT 1991
 *
 * (C) Copyright 1991, 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           OCRBLOCK_H
#define           OCRBLOCK_H

#include          "img.h"
#include          "ocrpara.h"
#include          "ocrrow.h"
#include          "pdblock.h"

class BLOCK;                     //forward decl

ELISTIZEH (BLOCK)
class BLOCK:public ELIST_LINK, public PDBLK
//page block
{
  friend class BLOCK_RECT_IT;    //block iterator

 public:
  BLOCK()
    : re_rotation_(1.0f, 0.0f),
      classify_rotation_(1.0f, 0.0f),
      skew_(1.0f, 0.0f) {
    right_to_left_ = false;
    hand_poly = NULL;
  }
  BLOCK(const char *name,  //< filename
        BOOL8 prop,        //< proportional
        inT16 kern,        //< kerning
        inT16 space,       //< spacing
        inT16 xmin,        //< bottom left
        inT16 ymin,
        inT16 xmax,        //< top right
        inT16 ymax);

  ~BLOCK () {
  }

  void set_stats(BOOL8 prop,
                 inT16 kern,
                 inT16 space,
                 inT16 ch_pitch) {
    proportional = prop;
    kerning = (inT8) kern;
    spacing = space;
    pitch = ch_pitch;
  }
  void set_xheight(inT32 height) {
    xheight = height;
  }
  void set_font_class(inT16 font) {
    font_class = font;
  }
  BOOL8 prop() const {
    return proportional;
  }
  bool right_to_left() const {
    return right_to_left_;
  }
  void set_right_to_left(bool value) {
    right_to_left_ = value;
  }
  inT32 fixed_pitch() const {
    return pitch;
  }
  inT16 kern() const {
    return kerning;
  }
  inT16 font() const {
    return font_class;
  }
  inT16 space() const {
    return spacing;
  }
  const char *name() const {
    return filename.string ();
  }
  inT32 x_height() const {
    return xheight;
  }
  float cell_over_xheight() const {
    return cell_over_xheight_;
  }
  void set_cell_over_xheight(float ratio) {
    cell_over_xheight_ = ratio;
  }
  ROW_LIST *row_list() {
    return &rows;
  }
  // Compute the margins between the edges of each row and this block's
  // polyblock, and store the results in the rows.
  void compute_row_margins();

  // get paragraphs
  PARA_LIST *para_list() {
    return &paras_;
  }
  C_BLOB_LIST *blob_list() {
    return &c_blobs;
  }
  C_BLOB_LIST *reject_blobs() {
    return &rej_blobs;
  }
  FCOORD re_rotation() const {
    return re_rotation_;         // How to transform coords back to image.
  }
  void set_re_rotation(const FCOORD& rotation) {
    re_rotation_ = rotation;
  }
  FCOORD classify_rotation() const {
    return classify_rotation_;   // Apply this before classifying.
  }
  void set_classify_rotation(const FCOORD& rotation) {
    classify_rotation_ = rotation;
  }
  FCOORD skew() const {
    return skew_;                // Direction of true horizontal.
  }
  void set_skew(const FCOORD& skew) {
    skew_ = skew;
  }
  const ICOORD& median_size() const {
    return median_size_;
  }
  void set_median_size(int x, int y) {
    median_size_.set_x(x);
    median_size_.set_y(y);
  }

  Pix* render_mask() {
    return PDBLK::render_mask(re_rotation_);
  }

  // Reflects the polygon in the y-axis and recomputes the bounding_box.
  // Does nothing to any contained rows/words/blobs etc.
  void reflect_polygon_in_y_axis();

  void rotate(const FCOORD& rotation);

  void sort_rows();

  void compress();

  void check_pitch();

  void compress(const ICOORD vec);

  void print(FILE *fp, BOOL8 dump);

  BLOCK& operator=(const BLOCK & source);

 private:
  BOOL8 proportional;          //< proportional
  bool right_to_left_;         //< major script is right to left.
  inT8 kerning;                //< inter blob gap
  inT16 spacing;               //< inter word gap
  inT16 pitch;                 //< pitch of non-props
  inT16 font_class;            //< correct font class
  inT32 xheight;               //< height of chars
  float cell_over_xheight_;    //< Ratio of cell height to xheight.
  STRING filename;             //< name of block
  ROW_LIST rows;               //< rows in block
  PARA_LIST paras_;            //< paragraphs of block
  C_BLOB_LIST c_blobs;         //< before textord
  C_BLOB_LIST rej_blobs;       //< duff stuff
  FCOORD re_rotation_;         //< How to transform coords back to image.
  FCOORD classify_rotation_;   //< Apply this before classifying.
  FCOORD skew_;                //< Direction of true horizontal.
  ICOORD median_size_;         //< Median size of blobs.
};

int decreasing_top_order(const void *row1, const void *row2);

// A function to print segmentation stats for the given block list.
void PrintSegmentationStats(BLOCK_LIST* block_list);

// Extracts blobs fromo the given block list and adds them to the output list.
// The block list must have been created by performing a page segmentation.
void ExtractBlobsFromSegmentation(BLOCK_LIST* blocks,
                                  C_BLOB_LIST* output_blob_list);

// Refreshes the words in the block_list by using blobs in the
// new_blobs list.
// Block list must have word segmentation in it.
// It consumes the blobs provided in the new_blobs list. The blobs leftover in
// the new_blobs list after the call weren't matched to any blobs of the words
// in block list.
// The output not_found_blobs is a list of blobs from the original segmentation
// in the block_list for which no corresponding new blobs were found.
void RefreshWordBlobsFromNewBlobs(BLOCK_LIST* block_list,
                                  C_BLOB_LIST* new_blobs,
                                  C_BLOB_LIST* not_found_blobs);

#endif