Tesseract produces searchable PDF directly. If you really want to use HOCR
as an
intermediate format, you can but you will need external software. There are
a couple
of "hocr2pdf" programs floating around and "OCRMyPDF" does an admirable
job
tying things together. That said, going direct should
Alexander Pozdnyakov has done a really good job packing Tesseract in his
Personal Package Archive (PPA). I think it is getting to be time for wider
usage,
so I'm working with him to promote these to official packages. First step
is
Debian Experimental. That's a good place to work out problems,
There is a lengthy side discussion that is appropriate to move
back here. I've been asked to elaborate what I mean by image
extraction.
https://github.com/tesseract-ocr/tesseract/issues/660
There are two ways to turn a PDF file into images. One is to
render it, for example using a tool like
I know from a separate email that you are using Debian GNU/Linux.
The default location on Debian is /usr/share/tesseract-ocr/tessdata
Therefore you need to either
1) do your work inside /usr/share/tesseract-ocr/tessdata, or
2) copy everything in
/usr/share/tesseract-ocr/tessdata to
Go ahead and take this question to the tesseract-ocr-for-php developers.
>From your error messages, you are running on a platform that
doesn't support fmemopen. If Windows, then there is trouble with
Leptonica's fallback function fopenWriteWinTempfile(). If Linux, then
somehow PHP is restricting
My understanding is PDF/A requires a bit more metadata, for example some
color profile information (ICC) and a description about where the data came
from (XMP). Tesseract doesn't supply that, sorry. I have no reason to
believe implementation is hard, it's just not something I'm currently
There's the normal Linux way for appending things:
tesseract image-1.png - >> results.txt
tesseract image-2.png - >> results.txt
tesseract image-3.png - >> results.txt
...
Or perhaps you are thinking about support for streaming:
Hi all, I just want to mention that the copy of tesstrain.sh that ships
with Ubuntu is slightly modified to make life a little easier. The
very terse documentation is in the standard location.
/usr/share/doc/tesseract/README.debian
The modification saves some typing. This is an example of
But I would like to see an example PDF - one of the simpler ones - just to
see how the vector graphics were done. Please do not get your hopes up.
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This would be ridiculously hard to implement.
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sudo apt-get install tesseract-dev
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Not to mention the data corruption problem on stdout. Maybe wait another
week or two for anything else to come up, and then declare 3.04.01?
(Just to be clear, it doesn't matter from Debian's perspective; the
stdout fix has already been patched there.)
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Or bake some really delicious cookies for Tom Powers, who is in charge of
Leptonica for Windows.
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Forget it. Leptonica is a core requirement and provides the primary in
memory image data structure, Pix.
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I think 'fas' is the language code for Persian.
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Tesseract is more complete in terms of 'throw me an arbitrary document
image and produce something useful'
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JBIG2 is a mutlipage image format, but is different from - for example -
multipage tiff
because the images are not independently compressed. They share compression
data, specifically a symbol dictionary.
There are three possible approaches here:
1. Have Tesseract accept JBIG2 images produced
Unfortunately, I think there is nothing we can do. I've done everything I
can to
maximize compatibility with various PDF rendering engines, but Preview uses
particularly terrible text extraction heuristics. To be fair, the root
problem is
the design and complexity of the PDF specification
You need version 1.71 or later. Current leptonica release is 1.72.
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Not available currently, and pretty major effort required to make it happen,
both in Leptonica and Tesseract's PDF output module. No plans to work
on this. For other formats we try hard to not re-encode during PDF
generation
whenever practical.
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This error comes from Leptonica 1.70. Tesseract now requires Leptonica 1.71.
Leptonica 1.71 can be installed manually (but not so easily) and will ship
with
Ubuntu for their 14.10 release scheduled for October 23 of this year.
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Done. Bonus points if someone can remember to remove
the instructions when they become obsolete in October.
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I've merged Nick White's bugfix into hocr-tools. Thank you, Nick.
I expect most people will instead use the native PDF support
built into Tesseract henceforth, and I intend to focus most of my
time and energy there.
However, there is still some use for hocr-pdf, especially when
working with
As for Arabic and other right-to-left scripts, please try using the new
native PDF capability in Tesseract instead. It is significantly more
sophisticated and I think it should work correctly.
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I don't know, it is up to Ray. My guess is quite soon. In any case,
I just ran on your example images, noticed a small problem, and
fixed it. Thank you for providing them.
I should also mention that there is no need to convert your binary
images to JPEG when using Tesseract's native PDF
I am the author of the hocr2pdf utility. Thank you for the patch,
I'll merge it some time next week. This week my focus is fixing
some problem reports with the new native PDF output capability
for Tesseract.
Jeff
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