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ocrx_line example #39

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30 changes: 27 additions & 3 deletions 1.2/index.bs
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Original file line number Diff line number Diff line change
Expand Up @@ -656,10 +656,34 @@ Issue: [ocr_carea vs ocrx_block](https://github.com/kba/hocr-spec/issues/28)

### `ocrx_line`

Issue: [ocr_line vs ocrx_line](https://github.com/kba/hocr-spec/issues/19)

* any kind of "line" returned by an OCR system that differs from the standard ocr_line above
* any kind of "line" returned by an OCR system that differs from [[#ocr_line]]
* might be some kind of "logical" line
* examples include line continuations and rowspan in tables

<div class="example">

Consider the following snippet, containing a wide-spaced heading broken over
two physical lines:

<figure>
<img
width=600
alt="Wide spaced two line heading"
src="../images/akf-widespaced-heading.png"/>
</figure>

An OCR engine could produce the following output, indicating the two physical
lines that form a single logical line:

```html
...
<span class="ocrx_line">
<span class='ocr_line' title="bbox 16 16 860 47">Aus den Gewinn- und Verlust-</span>
<span class='ocr_line' title="bbox 302 62 603 98">rechnungen</span>
</span>
...
```
</div>

### `ocrx_word`

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21 changes: 18 additions & 3 deletions 1.2/index.html
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Expand Up @@ -2124,13 +2124,29 @@ <h4 class="heading settled" data-level="9.1.1" id="ocrx_block"><span class="secn
<p>engine-specific because the definition of a "block" depends on the engine</p>
</ul>
<h4 class="heading settled" data-level="9.1.2" id="ocrx_line"><span class="secno">9.1.2. </span><span class="content"><code>ocrx_line</code></span><a class="self-link" href="#ocrx_line"></a></h4>
<p class="issue" id="issue-8ef34561"><a class="self-link" href="#issue-8ef34561"></a> <a href="https://github.com/kba/hocr-spec/issues/19">ocr_line vs ocrx_line</a></p>
<ul>
<li data-md="">
<p>any kind of "line" returned by an OCR system that differs from the standard ocr_line above</p>
<p>any kind of "line" returned by an OCR system that differs from <a href="#ocr_line">§6.1.4 ocr_line</a></p>
<li data-md="">
<p>might be some kind of "logical" line</p>
<li data-md="">
<p>examples include line continuations and rowspan in tables</p>
</ul>
<div class="example" id="example-3548e1d4">
<a class="self-link" href="#example-3548e1d4"></a>
<p>Consider the following snippet, containing a wide-spaced heading broken over
two physical lines:</p>
<figure> <img alt="Wide spaced two line heading" src="../images/akf-widespaced-heading.png" width="600"> </figure>
<p>An OCR engine could produce the following output, indicating the two physical
lines that form a single logical line:</p>
<pre class="language-html highlight">...
<span class="p">&lt;</span><span class="nt">span</span> <span class="na">class</span><span class="o">=</span><span class="s">"ocrx_line"</span><span class="p">></span>
<span class="p">&lt;</span><span class="nt">span</span> <span class="na">class</span><span class="o">=</span><span class="s">'ocr_line'</span> <span class="na">title</span><span class="o">=</span><span class="s">"bbox 16 16 860 47"</span><span class="p">></span>Aus den Gewinn- und Verlust-<span class="p">&lt;</span><span class="p">/</span><span class="nt">span</span><span class="p">></span>
<span class="p">&lt;</span><span class="nt">span</span> <span class="na">class</span><span class="o">=</span><span class="s">'ocr_line'</span> <span class="na">title</span><span class="o">=</span><span class="s">"bbox 302 62 603 98"</span><span class="p">></span>rechnungen<span class="p">&lt;</span><span class="p">/</span><span class="nt">span</span><span class="p">></span>
<span class="p">&lt;</span><span class="p">/</span><span class="nt">span</span><span class="p">></span>
...
</pre>
</div>
<h4 class="heading settled" data-level="9.1.3" id="ocrx_word"><span class="secno">9.1.3. </span><span class="content"><code>ocrx_word</code></span><a class="self-link" href="#ocrx_word"></a></h4>
<ul>
<li data-md="">
Expand Down Expand Up @@ -2816,7 +2832,6 @@ <h2 class="no-num no-ref heading settled" id="issues-index"><span class="content
<div class="issue"> There is currently no way of indicating anchoring or flow-around
properties for floating elements; properties need to be defined for this.<a href="#issue-3f2f70ed"> ↵ </a></div>
<div class="issue"> <a href="https://github.com/kba/hocr-spec/issues/28">ocr_carea vs ocrx_block</a><a href="#issue-66c198d9"> ↵ </a></div>
<div class="issue"> <a href="https://github.com/kba/hocr-spec/issues/19">ocr_line vs ocrx_line</a><a href="#issue-8ef34561"> ↵ </a></div>
<div class="issue"> <a href="https://github.com/kba/hocr-spec/issues/9">Delete x_cost</a><a href="#issue-b35297dd"> ↵ </a></div>
<div class="issue"> <a href="https://github.com/kba/hocr-spec/issues/2">XML namespace for hOCR HTML?</a><a href="#issue-f6d39356"> ↵ </a></div>
<div class="issue"> <a href="https://github.com/kba/hocr-spec/issues/1">What DOCTYPE for hOCR HTML?</a><a href="#issue-a3899b99"> ↵ </a></div>
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30 changes: 27 additions & 3 deletions 1.2/spec.md
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Expand Up @@ -627,10 +627,34 @@ Issue: [ocr_carea vs ocrx_block](https://github.com/kba/hocr-spec/issues/28)

### `ocrx_line`

Issue: [ocr_line vs ocrx_line](https://github.com/kba/hocr-spec/issues/19)

* any kind of "line" returned by an OCR system that differs from the standard ocr_line above
* any kind of "line" returned by an OCR system that differs from [[#ocr_line]]
* might be some kind of "logical" line
* examples include line continuations and rowspan in tables

<div class="example">

Consider the following snippet, containing a wide-spaced heading broken over
two physical lines:

<figure>
<img
width=600
alt="Wide spaced two line heading"
src="../images/akf-widespaced-heading.png"/>
</figure>

An OCR engine could produce the following output, indicating the two physical
lines that form a single logical line:

```html
...
<span class="ocrx_line">
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@amitdo amitdo Oct 2, 2016 •
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ocr_lines nested in ocrx_line? That's doesn't look right to me.

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@kba kba Oct 2, 2016

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It's ocr_line nested in ocrx_line, in this case a single heading split over two lines.

But I'll gladly make a better example if you have an idea. What i've seen in the wild is just replacements for ocr_line, e.g. https://github.com/jwilk/ocrodjvu/blob/master/lib/hocr.py.

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@amitdo amitdo Oct 2, 2016

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It's ocr_line nested in ocrx_line

Yeah, I fixed my original mistake...

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@amitdo amitdo Oct 2, 2016

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Sadly, I don't know what is the right way in this case.

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@tmbdev tmbdev Oct 22, 2016

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ocrx_line is engine-specific line markup. It exists for those cases where your OCR engine outputs text lines that don't correspond to "normal" text lines.

The most common case is if you apply an engine that's not capable of column segmentation to a multi-column document and you want to prevent subsequent processing stages from assuming that the text lines it gets contain text in reading order.

Basically, if you use ocrx_line instead of ocr_line, you're (intentionally) breaking most subsequent processing, since most OCR output processing will look for ocr_line tags (and assume they are in reading order).

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Tom, thanks for clarifying this for us.

<span class='ocr_line' title="bbox 16 16 860 47">Aus den Gewinn- und Verlust-</span>
<span class='ocr_line' title="bbox 302 62 603 98">rechnungen</span>
</span>
...
```
</div>

### `ocrx_word`

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