Comparison of OCR formats

Format Descriptions

Version	Released	Specs	Schema	Samples
1.0	December 2007	Google Doc Github	-	-
1.1	March 2010	Google Doc Github	-	[DTA] [UBMA:digi]

Smallest unit: word

<span
  class="ocrx_word"
  id="word_1_33"
  title="bbox 1584 1199 1997 1284; x_wconf 87"
  lang="deu-frak"
  dir="ltr"
  >Verhältnisse.</span>

Version	Released	Specs	Schema	Samples
1.0	December 02, 2004	-	XSD	-
2.0	January 11, 2010	-	XSD	[DTA] ALTO + Abbyy example
2.1	February 20, 2014	-	XSD	[DTA]
3.0	August, 2014	-	XSD	-
3.1	January, 2014	-	XSD	-

Version	Released	Specs	Schema	Samples
6v1	2002?	-	XSD	-	-
8v2	2006?	-	XSD	-	-
9v1	2007?	-	XSD	-	-
10v1	2011?	Description Visual Overview	XSD	[UBMA:digi] ALTO + Abbyy example

	hOCR	ALTO	ABBYY
Page	<div class="ocr_page">	<Page>	<page>
Text Area / Column	<div class="ocr_carea"> <div class="ocrx_block">	<PrintSpace>
Paragraph	<div class="ocr_par">	<TextBlock STYLEREFS="...">
Text Line	<div class="ocr_line">	<TextLine>	<line> <formatting>...</formatting> </line>
Word	<div class="ocrx_word">	<TextLine>	<line> <formatting>...</formatting> </line>

hOCR	ALTO	ABBYY
<div title="bbox 100 200 150 250"/>	<String HEIGHT="250" WIDTH="150" VPOS="100" HPOS="200"/>	<line l="200" t="100" r="1200" b="130">

hOCR	ALTO	ABBYY
&shy Soft hyphens must be represented using the HTML entity.[1] Regular hyphenation characters are just dashes	<HYP/> [1]

Level	hOCR	ALTO	ABBYY
Page	-	<Page PC="0.743"> [1]	-
Word	<span class="ocrx_word" title="x_wconf 71>foo</span> "if possible, convert word confidences to values between 0 and 100 and have them approximate posterior (expressed in %)"[1]	<String WC="0.422"> "Word Confidence: Confidence level of the ocr for this string. A value between 0 (unsure) and 1 (sure)."[1]	-
Character	<span class="ocrx_word" title="x_wconf 71>foo</span> "if possible, convert word confidences to values between 0 and 100 and have them approximate posterior probabilities (expressed in %)"[1] Not implemented in common engines?	<String CC="0 0 4 0" CONTENT="luft"/> "Confidence level of each character in that string. A list of numbers, one number between 0 (sure) and 9 (unsure) for each character."[1]