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Add option to generate hOCR output instead of raw text when performing OCR via tesseract #81

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Add option to generate hOCR output instead of raw text when performing OCR via tesseract #81

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584436f
Add option to generate hOCR output.
jhosteny May 16, 2013
8106858
Keep the .tif files around if generating hOCR output.
jhosteny May 17, 2013
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5 changes: 4 additions & 1 deletion lib/docsplit/command_line.rb
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Original file line number Diff line number Diff line change
Expand Up @@ -91,6 +91,9 @@ def parse_options
opts.on('--[no-]ocr', 'force OCR to be used, or disable OCR') do |o|
@options[:ocr] = o
end
opts.on('--hocr', 'force hOCR output when OCR enabled') do |h|
@options[:hocr] = h
end
opts.on('--no-clean', 'disable cleaning of OCR\'d text') do |c|
@options[:clean] = false
end
Expand Down Expand Up @@ -119,4 +122,4 @@ def parse_options

end

end
end
13 changes: 9 additions & 4 deletions lib/docsplit/text_extractor.rb
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Expand Up @@ -60,21 +60,25 @@ def extract_from_ocr(pdf, pages)
tempdir = Dir.mktmpdir
base_path = File.join(@output, @pdf_name)
escaped_pdf = ESCAPE[pdf]
additional_opts = ""
additional_opts += "hocr " if @use_hocr
if pages
pages.each do |page|
tiff = "#{tempdir}/#{@pdf_name}_#{page}.tif"
escaped_tiff = ESCAPE[tiff]
file = "#{base_path}_#{page}"
run "MAGICK_TMPDIR=#{tempdir} OMP_NUM_THREADS=2 gm convert -despeckle +adjoin #{MEMORY_ARGS} #{OCR_FLAGS} #{escaped_pdf}[#{page - 1}] #{escaped_tiff} 2>&1"
run "tesseract #{escaped_tiff} #{ESCAPE[file]} -l #{@language} 2>&1"
run "tesseract #{escaped_tiff} #{ESCAPE[file]} -l #{@language} #{additional_opts} 2>&1"
clean_text(file + '.txt') if @clean_ocr
run "cp #{escaped_tiff} #{base_path}_#{page}.tif" if @use_hocr
FileUtils.remove_entry_secure tiff
end
else
tiff = "#{tempdir}/#{@pdf_name}.tif"
escaped_tiff = ESCAPE[tiff]
run "MAGICK_TMPDIR=#{tempdir} OMP_NUM_THREADS=2 gm convert -despeckle #{MEMORY_ARGS} #{OCR_FLAGS} #{escaped_pdf} #{escaped_tiff} 2>&1"
run "tesseract #{escaped_tiff} #{base_path} -l #{@language} 2>&1"
run "tesseract #{escaped_tiff} #{base_path} -l #{@language} #{additional_opts} 2>&1"
run "cp #{escaped_tiff} #{base_path}.tif" if @use_hocr
clean_text(base_path + '.txt') if @clean_ocr
end
ensure
Expand Down Expand Up @@ -120,11 +124,12 @@ def extract_options(options)
@output = options[:output] || '.'
@pages = options[:pages]
@force_ocr = options[:ocr] == true
@use_hocr = options[:hocr] == true
@forbid_ocr = options[:ocr] == false
@clean_ocr = !(options[:clean] == false)
@clean_ocr = !(options[:clean] == false) && !@use_hocr
@language = options[:language] || 'eng'
end

end

end
end