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Use UB-Mannheim/ocr-fileformat as a starting point?

UB-Mannheim/ocr-fileformat already contains some converters.

Region Labelling outside

Hi @wrznr, it is better to make the region labelling outside the image on a white border. The labelling could disrupt the transcription or the recognition. I tried to solve this myself. See the image.
https://files.gitter.im/tboenig/0o3l/grafik.png

Extracted line images with wrong vertical offset

Here is an example of line image and matching text, both extracted with page2img.py:

Donnerstag und Samstag wird das Blatt künftig

Obviously there is a vertical offset, the text belongs to the next line, so a wrong image was extracted. All other line images show a similar vertical offset. The PAGE XML file was created by Transkribus, and it contains data which might be the cause for that:

[...]
<Page imageFilename="0111_nzz_18901222_0_0_a1_p1_1.tif" imageWidth="3839" imageHeight="5551">
    <PrintSpace>
        <Coords points="4,-27 3842,-27 3842,5524 4,5524"/>
    </PrintSpace>
    [...]
    <TextRegion type="paragraph" id="r_5_3" custom="readingOrder {index:12;}">
        <Coords points="117,1676 975,1676 975,1941 117,1941"/>
        [...]
        <TextLine id="tl_32" primaryLanguage="German" custom="readingOrder {index:1;}">
            <Coords points="122,1689 976,1689 976,1741 122,1741"/>
            <Baseline points="121,1762 976,1764"/>
            [...]

The PrintSpace tag is not handled by page2img.py, nor is it handled in ocrd_segment.

ABBYY produced this PAGE XML which contains good coordinates for the text line:

[...]
<Page imageFilename="1200024.tif" imageWidth="3839" imageHeight="5551">
    <PrintSpace>
        <Coords points="0,0 3838,0 3838,5551 0,5551"/>
    </PrintSpace>
    [...]
    <TextRegion type="paragraph" id="r_5_3" custom="readingOrder {index:12;}">
        <Coords points="112,1678 970,1678 970,1943 112,1943"/>
        [...]
        <TextLine id="tl_32" primaryLanguage="German" custom="readingOrder {index:1;}">
            <Coords points="115,1723 969,1723 969,1775 115,1775"/>
            <Baseline points="115,1798 969,1798"/>
            [...]

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