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Usually when OCR an table of content the columns are separated by a large space, so the outputs are not properly order. For example, for an table like this:

The output would be:

The Rank Function
Permutations of Atoms
Pure Set Theory and Axiom System ZF
3.5
3.6
3.7

I'd like it to be:

3.5 The Rank Function112
3.6 Permutations of Atoms116
3.7 Pure Set Theory and Axiom System ZF118

But different TOCs has different the output patterns, so there is no way to build a regex script to automatically fix every book. The best approach is to fix it at the first place. But how?


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@Megan

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Define what is: "fix it at the first place".

If you want to fix wrong output from OCR analysis, a simple solution on an infinite set of TOCs you will never make.
You will never apply all variations. You would have to create a machine learning algorithm that would analyze each TOC variant.

Or count substrings of the same characteristics (in simple TOC).

Chapter number
Chapter number
Chapter number
Chapter number
Chapter number
...

= 5

Chapter title
Chapter title
Chapter title
Chapter title
Chapter title
...

= 5

If you want to fix OCR analysis, it's a good to answer:
What OCR tool do you use?

For example, in Tesseract you can set, that text is processed by rows instead of columns.


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@Bryan

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Not really answer the question, but some books in Google Books have TOC:


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