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From Tilman Hausherr <THaush...@t-online.de>
Subject Re: Detecting if PDF contains only/mostly images.
Date Mon, 30 Oct 2017 17:54:39 GMT
Am 30.10.2017 um 16:52 schrieb Lachezar Dobrev:
>    I have been looking at it. I am actually using (a similar) approach
> to read embedded bar-codes, but there I can test all images.
>    The best I can see in ExtractImages is a way to check if there is
> only one image. However I can not check if there is additional text or
> other content, so that I do not mistakenly skip a page that has a
> single logo (for instance) and lots of other text information.
>    I tried looking at PDFTextStripper, but that is hard to follow.

That one is easy... just create the object, set start and end page, and 
then call getText().

Tilman

>
>    Is there any sure(-ish) sign that there is text on a page that I can
> use? Can I check for the existence of something that would tell me
> that there is additional content on the page other than the single
> image?
>
> 2017-10-30 15:53 GMT+02:00 Tilman Hausherr <THausherr@t-online.de>:
>> Am 30.10.2017 um 14:04 schrieb Lachezar Dobrev:
>>>     I have to process PDF files, that (supposedly) contain one big image
>>> per page, which is a result from a Document-Scanner. I'd like to avoid
>>> performing PDF-To-Image in these cases, and use the underlying image
>>> instead.
>>>     I am not well-versed in all things PDF and have no idea how to
>>> detect if a page has content other than a single image.
>>>     Please advise.
>>
>> Please have a look at the ExtractImages.java source code. You can change
>> that one to your needs.
>>
>> Tilman
>>
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