Segmenting an image into table cells?

LanX has asked for the wisdom of the Perl Monks concerning the following question:

Image::Magick has so many features that I'm not sure if I missed that one.

I want to cut out segments from a scanned text with tabular data, the "borders" are just white.

Unfortunately the quality is too bad for OCR (tesseract fails) and the font size, line height and table start varies.

I know how I would go algorithmically - that is counting pixels in rows and columns and guessing the tables geometry with a histogram.

I'm sure Image::Magick has more elaborate possibilities to go there ... any suggestions?

TIA! :)

Cheers Rolf
_{(addicted to the Perl Programming Language and ☆☆☆☆ :)

Je suis Charlie!}

Comment on Segmenting an image into table cells?

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Re: Segmenting an image into table cells? by Anonymous Monk on Nov 03, 2015 at 02:12 UTC
http://www.fmwconcepts.com/imagemagick/textcleaner/index.php? Cv/Image::CCV?	[reply]
Re: Segmenting an image into table cells? by LanX (Saint) on Nov 30, 2015 at 00:04 UTC
Answering my own question: Image::Magick allows to crop rows and columns, trimming the result can show if they are "empty". `$x = $p->Crop(geometry=>'439x4+166+167'); warn "$x" if "$x"; $x = $p->Trim(); warn "$x" if "$x"; print join ",",$p->Get(qw/columns rows page/);` [download] output Exception 310: geometry does not contain image `216.PNG' @ warning/att +ribute.c/GetImageBoundingBox/239 at /tmp/tst_im.pl line 36. 1,1,1238x1688-1-1 [download] so a clever combination of crops and trims can quite effectively dissect a table into it's cells. Of course one needs reasonable assumptions about the geometry. Cheers Rolf _{(addicted to the Perl Programming Language and ☆☆☆☆ :) Je suis Charlie!}	[reply] [d/l] [select]