dear tesseract community
atm, i'm trying to compare the performance of different ocr engines, one of
which is tesseract.
i have a ground truth already, which comes in page-xml files, where lines
look as follows:
<TextLine id="tl_7" primaryLanguage="German" custom="readingOrder {index:0;}
">
<Coords points="1281,594 1734,594 1734,657 1281,657"/>
<Baseline points="1282,642 1734,645"/>
<Word id="w_w1aab1b9b2b3b1ab1" language="German" custom="readingOrder
{index:0;}">
<Coords points="1281,594 1360,594 1360,643 1281,643"/>
<TextEquiv>
<Unicode>den</Unicode>
</TextEquiv>
<TextStyle fontFamily="Times New Roman" fontSize="16.0"/>
</Word>
<Word id="w_w1aab1b9b2b3b1b1b1" language="German" custom="readingOrder
{index:1;}">
<Coords points="1391,597 1452,597 1452,657 1391,657"/>
<TextEquiv>
<Unicode>19.</Unicode>
</TextEquiv>
<TextStyle fontFamily="Times New Roman" fontSize="15.0"/>
</Word>
<Word id="w_w1aab1b9b2b3b1b2b1" language="German" custom="readingOrder
{index:2;}">
<Coords points="1467,597 1734,597 1734,657 1467,657"/>
<TextEquiv>
<Unicode>Heumonat.</Unicode>
</TextEquiv>
<TextStyle fontFamily="Times New Roman" fontSize="16.0"/>
</Word>
<TextEquiv>
<Unicode>den 19. Heumonat.</Unicode>
</TextEquiv>
</TextLine>
i tried to follow the tesseract tutorial to train a model from scratch.
since i already have the coordinates of the line boxes, i created the .box
file from the points attribute in the TextLine Coords (line-based, so it
was smth like "WordStr <left> <bottom> <right> <top> 0 #text \n <left>
<bottom> <right> <top>"). when i try to produce the lstmf files, however, i
get many warnings that there is no box overlapping the text line.
i segmented the data already for another ocr system, which expects line
images and one text file with the corresponding transcription. i found that
the --psm option would allow for taking lines as an input.
since from the tutorial not everything is clear to me, i would like to ask
the following questions:
1. 1. if i have line tiffs and the corresponding text, say line0001.tif
and the text "den 19. Heumonat" in line0001.txt how do i
1. produce the unicharset file --> i used the unicharset_extractor
and let it run over all .box files i had and this worked, but is it the
right way?
2. what to the .box files need to look like? what coordinates do i
need to use? after all, it is the whole image
3. what data do i use to produce the required files? do i download
the *.traineddata from tesseract? do i produce this myself? does
tesseract
need a text file with all the text from the training data, wordlist from
training data, and so on?
i'm sorry, i know there is a doku but i find it very confusing. thanks in
advance for any helpful hints.
best,
phillip
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