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602 lines
23 KiB
C++
602 lines
23 KiB
C++
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/**********************************************************************
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* File: text2image.cpp
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* Description: Program to generate OCR training pages. Given a text file it
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* outputs an image with a given font and degradation.
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*
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* Note that since the results depend on the fonts available on
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* your system, running the code on a different machine, or
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* different OS, or even at a different time on the same machine,
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* may produce different fonts even if --font is given explicitly.
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* To see names of available fonts, use --list_available_fonts with
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* the appropriate --fonts_dir path.
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* Specifying --use_only_legacy_fonts will restrict the available
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* fonts to those listed in legacy_fonts.h
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*
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* Authors: Ranjith Unnikrishnan, Ray Smith
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* Created: Tue Nov 19 2013
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*
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* (C) Copyright 2013, Google Inc.
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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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#include <stdlib.h>
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#include <string.h>
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#include <algorithm>
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#include <iostream>
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#include <map>
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#include <string>
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#include <utility>
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#include <vector>
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#include "allheaders.h" // from leptonica
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#include "boxchar.h"
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#include "commandlineflags.h"
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#include "degradeimage.h"
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#include "errcode.h"
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#include "fileio.h"
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#include "normstrngs.h"
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#include "stringrenderer.h"
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#include "tlog.h"
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#include "unicharset.h"
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#include "util.h"
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#ifdef USE_STD_NAMESPACE
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using std::make_pair;
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using std::map;
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using std::pair;
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#endif
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// The text input file.
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STRING_PARAM_FLAG(text, "", "File name of text input to process");
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// The text output file.
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STRING_PARAM_FLAG(outputbase, "", "Basename for output image/box file");
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// Degrade the rendered image to mimic scanner quality.
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BOOL_PARAM_FLAG(degrade_image, true,
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"Degrade rendered image with speckle noise, dilation/erosion "
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"and rotation");
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// Degradation to apply to the image.
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INT_PARAM_FLAG(exposure, 0, "Exposure level in photocopier");
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// Output image resolution.
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INT_PARAM_FLAG(resolution, 300, "Pixels per inch");
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// Width of output image (in pixels).
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INT_PARAM_FLAG(xsize, 3600, "Width of output image");
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// Max height of output image (in pixels).
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INT_PARAM_FLAG(ysize, 4800, "Height of output image");
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// Margin around text (in pixels).
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INT_PARAM_FLAG(margin, 100, "Margin round edges of image");
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// Size of text (in points).
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INT_PARAM_FLAG(ptsize, 12, "Size of printed text");
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// Inter-character space (in ems).
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DOUBLE_PARAM_FLAG(char_spacing, 0, "Inter-character space in ems");
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// Inter-line space (in pixels).
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INT_PARAM_FLAG(leading, 12, "Inter-line space (in pixels)");
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// Layout and glyph orientation on rendering.
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STRING_PARAM_FLAG(writing_mode, "horizontal",
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"Specify one of the following writing"
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" modes.\n"
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"'horizontal' : Render regular horizontal text. (default)\n"
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"'vertical' : Render vertical text. Glyph orientation is"
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" selected by Pango.\n"
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"'vertical-upright' : Render vertical text. Glyph "
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" orientation is set to be upright.");
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INT_PARAM_FLAG(box_padding, 0, "Padding around produced bounding boxes");
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BOOL_PARAM_FLAG(strip_unrenderable_words, false,
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"Remove unrenderable words from source text");
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// Font name.
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STRING_PARAM_FLAG(font, "Arial", "Font description name to use");
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BOOL_PARAM_FLAG(ligatures, false,
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"Rebuild and render ligatures");
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BOOL_PARAM_FLAG(find_fonts, false,
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"Search for all fonts that can render the text");
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BOOL_PARAM_FLAG(render_per_font, true,
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"If find_fonts==true, render each font to its own image. "
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"Image filenames are of the form output_name.font_name.tif");
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BOOL_PARAM_FLAG(list_available_fonts, false, "List available fonts and quit.");
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BOOL_PARAM_FLAG(render_ngrams, false, "Put each space-separated entity from the"
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" input file into one bounding box. The ngrams in the input"
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" file will be randomly permuted before rendering (so that"
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" there is sufficient variety of characters on each line).");
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BOOL_PARAM_FLAG(output_word_boxes, false,
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"Output word bounding boxes instead of character boxes. "
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"This is used for Cube training, and implied by "
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"--render_ngrams.");
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STRING_PARAM_FLAG(unicharset_file, "",
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"File with characters in the unicharset. If --render_ngrams"
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" is true and --unicharset_file is specified, ngrams with"
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" characters that are not in unicharset will be omitted");
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BOOL_PARAM_FLAG(bidirectional_rotation, false,
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"Rotate the generated characters both ways.");
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BOOL_PARAM_FLAG(only_extract_font_properties, false,
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"Assumes that the input file contains a list of ngrams. Renders"
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" each ngram, extracts spacing properties and records them in"
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" output_base/[font_name].fontinfo file.");
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// Use these flags to output zero-padded, square individual character images
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BOOL_PARAM_FLAG(output_individual_glyph_images, false,
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"If true also outputs individual character images");
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INT_PARAM_FLAG(glyph_resized_size, 0,
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"Each glyph is square with this side length in pixels");
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INT_PARAM_FLAG(glyph_num_border_pixels_to_pad, 0,
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"Final_size=glyph_resized_size+2*glyph_num_border_pixels_to_pad");
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namespace tesseract {
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struct SpacingProperties {
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SpacingProperties() : x_gap_before(0), x_gap_after(0) {}
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SpacingProperties(int b, int a) : x_gap_before(b), x_gap_after(a) {}
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// These values are obtained from FT_Glyph_Metrics struct
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// used by the FreeType font engine.
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int x_gap_before; // horizontal x bearing
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int x_gap_after; // horizontal advance - x_gap_before - width
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map<string, int> kerned_x_gaps;
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};
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static bool IsWhitespaceBox(const BoxChar* boxchar) {
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return (boxchar->box() == NULL ||
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SpanUTF8Whitespace(boxchar->ch().c_str()));
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}
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static string StringReplace(const string& in,
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const string& oldsub, const string& newsub) {
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string out;
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int start_pos = 0;
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do {
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int pos = in.find(oldsub, start_pos);
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if (pos == string::npos) break;
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out.append(in.data() + start_pos, pos - start_pos);
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out.append(newsub.data(), newsub.length());
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start_pos = pos + oldsub.length();
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} while (true);
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out.append(in.data() + start_pos, in.length() - start_pos);
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return out;
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}
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// Assumes that each word (whitespace-separated entity) in text is a bigram.
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// Renders the bigrams and calls FontInfo::GetSpacingProperties() to
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// obtain spacing information. Produces the output .fontinfo file with a line
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// per unichar of the form:
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// unichar space_before space_after kerned1 kerned_space1 kerned2 ...
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// Fox example, if unichar "A" has spacing of 0 pixels before and -1 pixels
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// after, is kerned with "V" resulting in spacing of "AV" to be -7 and kerned
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// with "T", such that "AT" has spacing of -5, the entry/line for unichar "A"
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// in .fontinfo file will be:
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// A 0 -1 T -5 V -7
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void ExtractFontProperties(const string &utf8_text,
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StringRenderer *render,
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const string &output_base) {
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map<string, SpacingProperties> spacing_map;
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map<string, SpacingProperties>::iterator spacing_map_it0;
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map<string, SpacingProperties>::iterator spacing_map_it1;
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int x_bearing, x_advance;
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int len = utf8_text.length();
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int offset = 0;
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const char* text = utf8_text.c_str();
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while (offset < len) {
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offset += render->RenderToImage(text + offset, strlen(text + offset), NULL);
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const vector<BoxChar*> &boxes = render->GetBoxes();
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// If the page break split a bigram, correct the offset so we try the bigram
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// on the next iteration.
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if (boxes.size() > 2 && !IsWhitespaceBox(boxes[boxes.size() - 1]) &&
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IsWhitespaceBox(boxes[boxes.size() - 2])) {
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if (boxes.size() > 3) {
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tprintf("WARNING: Adjusting to bad page break after '%s%s'\n",
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boxes[boxes.size() - 4]->ch().c_str(),
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boxes[boxes.size() - 3]->ch().c_str());
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}
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offset -= boxes[boxes.size() - 1]->ch().size();
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}
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for (int b = 0; b < boxes.size(); b += 2) {
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while (b < boxes.size() && IsWhitespaceBox(boxes[b])) ++b;
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if (b + 1 >= boxes.size()) break;
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const string &ch0 = boxes[b]->ch();
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// We encountered a ligature. This happens in at least two scenarios:
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// One is when the rendered bigram forms a grapheme cluster (eg. the
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// second character in the bigram is a combining vowel), in which case we
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// correctly output only one bounding box.
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// A second far less frequent case is when caused some fonts like 'DejaVu
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// Sans Ultra-Light' force Pango to render a ligatured character even if
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// the input consists of the separated characters. NOTE(ranjith): As per
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// behdad@ this is not currently controllable at the level of the Pango
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// API.
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// Safeguard against these cases here by just skipping the bigram.
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if (IsWhitespaceBox(boxes[b+1])) {
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tprintf("WARNING: Found unexpected ligature: %s\n", ch0.c_str());
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continue;
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}
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int xgap = (boxes[b+1]->box()->x -
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(boxes[b]->box()->x + boxes[b]->box()->w));
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spacing_map_it0 = spacing_map.find(ch0);
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int ok_count = 0;
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if (spacing_map_it0 == spacing_map.end() &&
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render->font().GetSpacingProperties(ch0, &x_bearing, &x_advance)) {
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spacing_map[ch0] = SpacingProperties(
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x_bearing, x_advance - x_bearing - boxes[b]->box()->w);
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spacing_map_it0 = spacing_map.find(ch0);
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++ok_count;
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}
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const string &ch1 = boxes[b+1]->ch();
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tlog(3, "%s%s\n", ch0.c_str(), ch1.c_str());
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spacing_map_it1 = spacing_map.find(ch1);
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if (spacing_map_it1 == spacing_map.end() &&
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render->font().GetSpacingProperties(ch1, &x_bearing, &x_advance)) {
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spacing_map[ch1] = SpacingProperties(
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x_bearing, x_advance - x_bearing - boxes[b+1]->box()->w);
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spacing_map_it1 = spacing_map.find(ch1);
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++ok_count;
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}
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if (ok_count == 2 && xgap != (spacing_map_it0->second.x_gap_after +
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spacing_map_it1->second.x_gap_before)) {
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spacing_map_it0->second.kerned_x_gaps[ch1] = xgap;
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}
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}
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render->ClearBoxes();
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}
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string output_string;
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const int kBufSize = 1024;
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char buf[kBufSize];
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snprintf(buf, kBufSize, "%d\n", static_cast<int>(spacing_map.size()));
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output_string.append(buf);
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map<string, SpacingProperties>::const_iterator spacing_map_it;
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for (spacing_map_it = spacing_map.begin();
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spacing_map_it != spacing_map.end(); ++spacing_map_it) {
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snprintf(buf, kBufSize,
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"%s %d %d %d", spacing_map_it->first.c_str(),
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spacing_map_it->second.x_gap_before,
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spacing_map_it->second.x_gap_after,
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static_cast<int>(spacing_map_it->second.kerned_x_gaps.size()));
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output_string.append(buf);
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map<string, int>::const_iterator kern_it;
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for (kern_it = spacing_map_it->second.kerned_x_gaps.begin();
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kern_it != spacing_map_it->second.kerned_x_gaps.end(); ++kern_it) {
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snprintf(buf, kBufSize,
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" %s %d", kern_it->first.c_str(), kern_it->second);
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output_string.append(buf);
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}
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output_string.append("\n");
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}
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File::WriteStringToFileOrDie(output_string, output_base + ".fontinfo");
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}
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bool MakeIndividualGlyphs(Pix* pix,
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const vector<BoxChar*>& vbox,
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const int input_tiff_page) {
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// If checks fail, return false without exiting text2image
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if (!pix) {
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tprintf("ERROR: MakeIndividualGlyphs(): Input Pix* is NULL\n");
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return false;
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} else if (FLAGS_glyph_resized_size <= 0) {
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tprintf("ERROR: --glyph_resized_size must be positive\n");
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return false;
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} else if (FLAGS_glyph_num_border_pixels_to_pad < 0) {
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tprintf("ERROR: --glyph_num_border_pixels_to_pad must be 0 or positive\n");
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return false;
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}
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const int n_boxes = vbox.size();
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int n_boxes_saved = 0;
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int current_tiff_page = 0;
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int y_previous = 0;
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static int glyph_count = 0;
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for (int i = 0; i < n_boxes; i++) {
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// Get one bounding box
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Box* b = vbox[i]->mutable_box();
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if (!b) continue;
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const int x = b->x;
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const int y = b->y;
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const int w = b->w;
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const int h = b->h;
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// Check present tiff page (for multipage tiff)
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if (y < y_previous-pixGetHeight(pix)/10) {
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tprintf("ERROR: Wrap-around encountered, at i=%d\n", i);
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current_tiff_page++;
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}
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if (current_tiff_page < input_tiff_page) continue;
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else if (current_tiff_page > input_tiff_page) break;
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// Check box validity
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if (x < 0 || y < 0 ||
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(x+w-1) >= pixGetWidth(pix) ||
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(y+h-1) >= pixGetHeight(pix)) {
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tprintf("ERROR: MakeIndividualGlyphs(): Index out of range, at i=%d"
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" (x=%d, y=%d, w=%d, h=%d\n)", i, x, y, w, h);
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continue;
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} else if (w < FLAGS_glyph_num_border_pixels_to_pad &&
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h < FLAGS_glyph_num_border_pixels_to_pad) {
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tprintf("ERROR: Input image too small to be a character, at i=%d\n", i);
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continue;
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}
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// Crop the boxed character
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Pix* pix_glyph = pixClipRectangle(pix, b, NULL);
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if (!pix_glyph) {
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tprintf("ERROR: MakeIndividualGlyphs(): Failed to clip, at i=%d\n", i);
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continue;
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}
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// Resize to square
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Pix* pix_glyph_sq = pixScaleToSize(pix_glyph,
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FLAGS_glyph_resized_size,
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FLAGS_glyph_resized_size);
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if (!pix_glyph_sq) {
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tprintf("ERROR: MakeIndividualGlyphs(): Failed to resize, at i=%d\n", i);
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continue;
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}
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// Zero-pad
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Pix* pix_glyph_sq_pad = pixAddBorder(pix_glyph_sq,
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FLAGS_glyph_num_border_pixels_to_pad,
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0);
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if (!pix_glyph_sq_pad) {
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tprintf("ERROR: MakeIndividualGlyphs(): Failed to zero-pad, at i=%d\n", i);
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continue;
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}
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// Write out
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Pix* pix_glyph_sq_pad_8 = pixConvertTo8(pix_glyph_sq_pad, false);
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char filename[1024];
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snprintf(filename, 1024, "%s_%d.jpg", FLAGS_outputbase.c_str(),
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glyph_count++);
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if (pixWriteJpeg(filename, pix_glyph_sq_pad_8, 100, 0)) {
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tprintf("ERROR: MakeIndividualGlyphs(): Failed to write JPEG to %s,"
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" at i=%d\n", filename, i);
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continue;
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}
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pixDestroy(&pix_glyph);
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pixDestroy(&pix_glyph_sq);
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pixDestroy(&pix_glyph_sq_pad);
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pixDestroy(&pix_glyph_sq_pad_8);
|
||
|
n_boxes_saved++;
|
||
|
y_previous = y;
|
||
|
}
|
||
|
if (n_boxes_saved == 0) {
|
||
|
return false;
|
||
|
} else {
|
||
|
tprintf("Total number of characters saved = %d\n", n_boxes_saved);
|
||
|
return true;
|
||
|
}
|
||
|
}
|
||
|
} // namespace tesseract
|
||
|
|
||
|
using tesseract::DegradeImage;
|
||
|
using tesseract::ExtractFontProperties;
|
||
|
using tesseract::File;
|
||
|
using tesseract::FontUtils;
|
||
|
using tesseract::SpanUTF8NotWhitespace;
|
||
|
using tesseract::SpanUTF8Whitespace;
|
||
|
using tesseract::StringRenderer;
|
||
|
|
||
|
int main(int argc, char** argv) {
|
||
|
tesseract::ParseCommandLineFlags(argv[0], &argc, &argv, true);
|
||
|
|
||
|
if (FLAGS_list_available_fonts) {
|
||
|
const vector<string>& all_fonts = FontUtils::ListAvailableFonts();
|
||
|
for (int i = 0; i < all_fonts.size(); ++i) {
|
||
|
tprintf("%3d: %s\n", i, all_fonts[i].c_str());
|
||
|
ASSERT_HOST_MSG(FontUtils::IsAvailableFont(all_fonts[i].c_str()),
|
||
|
"Font %s is unrecognized.\n", all_fonts[i].c_str());
|
||
|
}
|
||
|
return EXIT_SUCCESS;
|
||
|
}
|
||
|
// Check validity of input flags.
|
||
|
ASSERT_HOST_MSG(!FLAGS_text.empty(), "Text file missing!\n");
|
||
|
ASSERT_HOST_MSG(!FLAGS_outputbase.empty(), "Output file missing!\n");
|
||
|
ASSERT_HOST_MSG(FLAGS_render_ngrams || FLAGS_unicharset_file.empty(),
|
||
|
"Use --unicharset_file only if --render_ngrams is set.\n");
|
||
|
|
||
|
ASSERT_HOST_MSG(FLAGS_find_fonts ||
|
||
|
FontUtils::IsAvailableFont(FLAGS_font.c_str()),
|
||
|
"Could not find font named %s\n", FLAGS_font.c_str());
|
||
|
|
||
|
if (FLAGS_render_ngrams)
|
||
|
FLAGS_output_word_boxes = true;
|
||
|
|
||
|
char font_desc_name[1024];
|
||
|
snprintf(font_desc_name, 1024, "%s %d", FLAGS_font.c_str(),
|
||
|
static_cast<int>(FLAGS_ptsize));
|
||
|
StringRenderer render(font_desc_name, FLAGS_xsize, FLAGS_ysize);
|
||
|
render.set_add_ligatures(FLAGS_ligatures);
|
||
|
render.set_leading(FLAGS_leading);
|
||
|
render.set_resolution(FLAGS_resolution);
|
||
|
render.set_char_spacing(FLAGS_char_spacing * FLAGS_ptsize);
|
||
|
render.set_h_margin(FLAGS_margin);
|
||
|
render.set_v_margin(FLAGS_margin);
|
||
|
render.set_output_word_boxes(FLAGS_output_word_boxes);
|
||
|
render.set_box_padding(FLAGS_box_padding);
|
||
|
render.set_strip_unrenderable_words(FLAGS_strip_unrenderable_words);
|
||
|
|
||
|
// Set text rendering orientation and their forms.
|
||
|
if (FLAGS_writing_mode == "horizontal") {
|
||
|
// Render regular horizontal text (default).
|
||
|
render.set_vertical_text(false);
|
||
|
render.set_gravity_hint_strong(false);
|
||
|
render.set_render_fullwidth_latin(false);
|
||
|
} else if (FLAGS_writing_mode == "vertical") {
|
||
|
// Render vertical text. Glyph orientation is selected by Pango.
|
||
|
render.set_vertical_text(true);
|
||
|
render.set_gravity_hint_strong(false);
|
||
|
render.set_render_fullwidth_latin(false);
|
||
|
} else if (FLAGS_writing_mode == "vertical-upright") {
|
||
|
// Render vertical text. Glyph orientation is set to be upright.
|
||
|
// Also Basic Latin characters are converted to their fullwidth forms
|
||
|
// on rendering, since fullwidth Latin characters are well designed to fit
|
||
|
// vertical text lines, while .box files store halfwidth Basic Latin
|
||
|
// unichars.
|
||
|
render.set_vertical_text(true);
|
||
|
render.set_gravity_hint_strong(true);
|
||
|
render.set_render_fullwidth_latin(true);
|
||
|
} else {
|
||
|
TLOG_FATAL("Invalid writing mode : %s\n", FLAGS_writing_mode.c_str());
|
||
|
}
|
||
|
|
||
|
string src_utf8;
|
||
|
// This c_str is NOT redundant!
|
||
|
File::ReadFileToStringOrDie(FLAGS_text.c_str(), &src_utf8);
|
||
|
|
||
|
// Remove the unicode mark if present.
|
||
|
if (strncmp(src_utf8.c_str(), "\xef\xbb\xbf", 3) == 0) {
|
||
|
src_utf8.erase(0, 3);
|
||
|
}
|
||
|
tlog(1, "Render string of size %d\n", src_utf8.length());
|
||
|
|
||
|
if (FLAGS_render_ngrams || FLAGS_only_extract_font_properties) {
|
||
|
// Try to preserve behavior of old text2image by expanding inter-word
|
||
|
// spaces by a factor of 4.
|
||
|
const string kSeparator = FLAGS_render_ngrams ? " " : " ";
|
||
|
// Also restrict the number of charactes per line to try and avoid
|
||
|
// line-breaking in the middle of words like "-A", "R$" etc. which are
|
||
|
// otherwise allowed by the standard unicode line-breaking rules.
|
||
|
const int kCharsPerLine = (FLAGS_ptsize > 20) ? 50 : 100;
|
||
|
string rand_utf8;
|
||
|
UNICHARSET unicharset;
|
||
|
if (FLAGS_render_ngrams && !FLAGS_unicharset_file.empty() &&
|
||
|
!unicharset.load_from_file(FLAGS_unicharset_file.c_str())) {
|
||
|
TLOG_FATAL("Failed to load unicharset from file %s\n",
|
||
|
FLAGS_unicharset_file.c_str());
|
||
|
}
|
||
|
|
||
|
// If we are rendering ngrams that will be OCRed later, shuffle them so that
|
||
|
// tesseract does not have difficulties finding correct baseline, word
|
||
|
// spaces, etc.
|
||
|
const char *str8 = src_utf8.c_str();
|
||
|
int len = src_utf8.length();
|
||
|
int step;
|
||
|
vector<pair<int, int> > offsets;
|
||
|
int offset = SpanUTF8Whitespace(str8);
|
||
|
while (offset < len) {
|
||
|
step = SpanUTF8NotWhitespace(str8 + offset);
|
||
|
offsets.push_back(make_pair(offset, step));
|
||
|
offset += step;
|
||
|
offset += SpanUTF8Whitespace(str8 + offset);
|
||
|
}
|
||
|
if (FLAGS_render_ngrams)
|
||
|
std::random_shuffle(offsets.begin(), offsets.end());
|
||
|
|
||
|
for (int i = 0, line = 1; i < offsets.size(); ++i) {
|
||
|
const char *curr_pos = str8 + offsets[i].first;
|
||
|
int ngram_len = offsets[i].second;
|
||
|
// Skip words that contain characters not in found in unicharset.
|
||
|
if (!FLAGS_unicharset_file.empty() &&
|
||
|
!unicharset.encodable_string(curr_pos, NULL)) {
|
||
|
continue;
|
||
|
}
|
||
|
rand_utf8.append(curr_pos, ngram_len);
|
||
|
if (rand_utf8.length() > line * kCharsPerLine) {
|
||
|
rand_utf8.append(" \n");
|
||
|
++line;
|
||
|
if (line & 0x1) rand_utf8.append(kSeparator);
|
||
|
} else {
|
||
|
rand_utf8.append(kSeparator);
|
||
|
}
|
||
|
}
|
||
|
tlog(1, "Rendered ngram string of size %d\n", rand_utf8.length());
|
||
|
src_utf8.swap(rand_utf8);
|
||
|
}
|
||
|
if (FLAGS_only_extract_font_properties) {
|
||
|
tprintf("Extracting font properties only\n");
|
||
|
ExtractFontProperties(src_utf8, &render, FLAGS_outputbase.c_str());
|
||
|
tprintf("Done!\n");
|
||
|
return 0;
|
||
|
}
|
||
|
|
||
|
int im = 0;
|
||
|
vector<float> page_rotation;
|
||
|
const char* to_render_utf8 = src_utf8.c_str();
|
||
|
|
||
|
// We use a two pass mechanism to rotate images in both direction.
|
||
|
// The first pass(0) will rotate the images in random directions and
|
||
|
// the second pass(1) will mirror those rotations.
|
||
|
int num_pass = FLAGS_bidirectional_rotation ? 2 : 1;
|
||
|
for (int pass = 0; pass < num_pass; ++pass) {
|
||
|
int page_num = 0;
|
||
|
string font_used;
|
||
|
for (int offset = 0; offset < strlen(to_render_utf8); ++im, ++page_num) {
|
||
|
tlog(1, "Starting page %d\n", im);
|
||
|
Pix* pix = NULL;
|
||
|
if (FLAGS_find_fonts) {
|
||
|
offset += render.RenderAllFontsToImage(to_render_utf8 + offset,
|
||
|
strlen(to_render_utf8 + offset),
|
||
|
&font_used, &pix);
|
||
|
} else {
|
||
|
offset += render.RenderToImage(to_render_utf8 + offset,
|
||
|
strlen(to_render_utf8 + offset), &pix);
|
||
|
}
|
||
|
if (pix != NULL) {
|
||
|
float rotation = 0;
|
||
|
if (pass == 1) {
|
||
|
// Pass 2, do mirror rotation.
|
||
|
rotation = -1 * page_rotation[page_num];
|
||
|
}
|
||
|
if (FLAGS_degrade_image) {
|
||
|
pix = DegradeImage(pix, FLAGS_exposure, &rotation);
|
||
|
}
|
||
|
render.RotatePageBoxes(rotation);
|
||
|
|
||
|
if (pass == 0) {
|
||
|
// Pass 1, rotate randomly and store the rotation..
|
||
|
page_rotation.push_back(rotation);
|
||
|
}
|
||
|
|
||
|
Pix* gray_pix = pixConvertTo8(pix, false);
|
||
|
pixDestroy(&pix);
|
||
|
Pix* binary = pixThresholdToBinary(gray_pix, 128);
|
||
|
pixDestroy(&gray_pix);
|
||
|
char tiff_name[1024];
|
||
|
if (FLAGS_find_fonts && FLAGS_render_per_font) {
|
||
|
string fontname_for_file = tesseract::StringReplace(
|
||
|
font_used, " ", "_");
|
||
|
snprintf(tiff_name, 1024, "%s.%s.tif", FLAGS_outputbase.c_str(),
|
||
|
fontname_for_file.c_str());
|
||
|
pixWriteTiff(tiff_name, binary, IFF_TIFF_G4, "w");
|
||
|
} else {
|
||
|
snprintf(tiff_name, 1024, "%s.tif", FLAGS_outputbase.c_str());
|
||
|
pixWriteTiff(tiff_name, binary, IFF_TIFF_G4, im == 0 ? "w" : "a");
|
||
|
}
|
||
|
tprintf("Rendered page %d to file %s\n", im, tiff_name);
|
||
|
// Make individual glyphs
|
||
|
if (FLAGS_output_individual_glyph_images) {
|
||
|
if (!MakeIndividualGlyphs(binary, render.GetBoxes(), im)) {
|
||
|
tprintf("ERROR: Individual glyphs not saved\n");
|
||
|
}
|
||
|
}
|
||
|
pixDestroy(&binary);
|
||
|
}
|
||
|
}
|
||
|
}
|
||
|
if (!FLAGS_find_fonts) {
|
||
|
string box_name = FLAGS_outputbase.c_str();
|
||
|
box_name += ".box";
|
||
|
render.WriteAllBoxes(box_name);
|
||
|
}
|
||
|
|
||
|
return 0;
|
||
|
}
|