NAME¶
text2image - generate OCR training pages.
SYNOPSIS¶
text2image --text FILE --outputbase PATH
--fonts_dir PATH [OPTION]
DESCRIPTION¶
text2image(1) generates OCR training pages. Given a text file it
outputs an image with a given font and degradation.
OPTIONS¶
--text FILE
File name of text input to use for creating synthetic
training data. (type:string default:)
--outputbase FILE
Basename for output image/box file (type:string
default:)
--fontconfig_tmpdir PATH
Overrides fontconfig default temporary dir (type:string
default:/tmp)
--fonts_dir PATH
If empty it use system default. Otherwise it overrides
system default font location (type:string default:)
--font FONTNAME
Font description name to use (type:string
default:Arial)
--writing_mode MODE
Specify one of the following writing modes.
horizontal : Render regular horizontal text. (default) vertical
: Render vertical text. Glyph orientation is selected by Pango.
vertical-upright : Render vertical text. Glyph orientation is set to be
upright. (type:string default:horizontal)
--tlog_level INT
Minimum logging level for tlog() output (type:int
default:0)
--max_pages INT
Maximum number of pages to output (0=unlimited) (type:int
default:0)
--degrade_image BOOL
Degrade rendered image with speckle noise,
dilation/erosion and rotation (type:bool default:true)
--rotate_image BOOL
Rotate the image in a random way. (type:bool
default:true)
--strip_unrenderable_words BOOL
Remove unrenderable words from source text (type:bool
default:true)
--ligatures BOOL
Rebuild and render ligatures (type:bool
default:false)
--exposure INT
Exposure level in photocopier (type:int default:0)
--resolution INT
Pixels per inch (type:int default:300)
--xsize INT
Width of output image (type:int default:3600)
--ysize INT
Height of output image (type:int default:4800)
--margin INT
Margin round edges of image (type:int default:100)
--ptsize INT
Size of printed text (type:int default:12)
--leading INT
Inter-line space (in pixels) (type:int default:12)
--box_padding INT
Padding around produced bounding boxes (type:int
default:0)
--char_spacing DOUBLE
Inter-character space in ems (type:double
default:0)
--underline_start_prob DOUBLE
Fraction of words to underline (value in [0,1])
(type:double default:0)
--underline_continuation_prob DOUBLE
Fraction of words to underline (value in [0,1])
(type:double default:0)
--render_ngrams BOOL
Put each space-separated entity from the input file into
one bounding box. The ngrams in the input file will be randomly permuted
before rendering (so that there is sufficient variety of characters on each
line). (type:bool default:false)
--output_word_boxes BOOL
Output word bounding boxes instead of character boxes.
This is used for Cube training, and implied by --render_ngrams. (type:bool
default:false)
--unicharset_file FILE
File with characters in the unicharset. If
--render_ngrams is true and --unicharset_file is specified, ngrams with
characters that are not in unicharset will be omitted (type:string
default:)
--bidirectional_rotation BOOL
Rotate the generated characters both ways. (type:bool
default:false)
--only_extract_font_properties BOOL
Assumes that the input file contains a list of ngrams.
Renders each ngram, extracts spacing properties and records them in
output_base/[font_name].fontinfo file. (type:bool default:false)
USE THESE FLAGS TO OUTPUT ZERO-PADDED, SQUARE INDIVIDUAL CHARACTER IMAGES¶
--output_individual_glyph_images BOOL
If true also outputs individual character images
(type:bool default:false)
--glyph_resized_size INT
Each glyph is square with this side length in pixels
(type:int default:0)
--glyph_num_border_pixels_to_pad INT
Final_size=glyph_resized_size+2*glyph_num_border_pixels_to_pad
(type:int default:0)
USE THESE FLAGS TO FIND FONTS THAT CAN RENDER A GIVEN TEXT¶
--find_fonts BOOL
Search for all fonts that can render the text (type:bool
default:false)
--render_per_font BOOL
If find_fonts==true, render each font to its own image.
Image filenames are of the form output_name.font_name.tif (type:bool
default:true)
--min_coverage DOUBLE
If find_fonts==true, the minimum coverage the font has of
the characters in the text file to include it, between 0 and 1. (type:double
default:1)
Example Usage: ``` text2image --find_fonts \ --fonts_dir
/usr/share/fonts \ --text ../langdata/hin/hin.training_text \ --min_coverage
.9 \ --render_per_font \ --outputbase ../langdata/hin/hin \ |& grep raw
| sed -e s/ :.*/" \\/g | sed -e s/^/ "/
>../langdata/hin/fontslist.txt ```
SINGLE OPTIONS¶
--list_available_fonts BOOL
List available fonts and quit. (type:bool
default:false)
COPYING¶
Copyright (C) 2012 Google, Inc. Licensed under the Apache License,
Version 2.0
AUTHOR¶
The Tesseract OCR engine was written by Ray Smith and his research
groups at Hewlett Packard (1985-1995) and Google (2006-present).
