Tabula extract tables by area coordinates

问题

We are given the option to extract tables from a PDF document by specifying its coordinates. For windows users, in order to get the coordinates, you have to upload the PDF file to Tabula web page and export the script which contains the coordinates then input the coordinates into your code. For Mac users, you just have to use the Preview app and the crop inspector. I'm just wondering if there are any third party programs or plug-ins which offer this to Windows user? I think this will be handy under the following situation:

When you do not have internet access.
I think the preview app will be more accurate because I have experienced inaccurate coordinates produced from the Tabula web page.

Will be grateful if anyone can point me to where I can find such thing. Much thanks.

回答1:

Tabula needs areas to be specified in PDF units, which are defined to be 1/72 of an inch. If using Acrobat Reader DC, you can use the Measure tool and multiply its readings by 72.

Tabula needs the area to be specified as the top, left, bottom and right distances. To obtain them, you can measure the distances from the top of the page to the beginning of the table and so on.

回答2:

I had the same problem, the code seemed to ignore the area callout. Fixed it by including "guess = False" in the command line. like so (note I'm using revision 1.2.1):

df = tabula.read_pdf(file_folder + file_name, 
                     guess=False, pages=1, stream=True , encoding="utf-8", 
                     area = (200.8125,64.6425,352.2825,496.1025), 
                     columns = (65.3,196.86,294.96,351.81,388.21,429.77))

回答3:

Tabula can understand coordinates data in the form of "points".

In windows you can measure your areas coordinates with Adobe Acrobat DC and Acrobat Reader DC

if you have Adobe Acrobat DC - Tools >> Edit PDF >> Select Your Area and Press Enter >> Change Units to Points

Top               100       pt = A
Left              50        pt = B
Cropped page size 370 x 225 pt = C x D

if you have Adobe Acrobat DC or Acrobat Reader DC- Edit >> Preferences >> Units >> Change Page Units to Points >> OK >> Tools >> Measure

Top           = A = 100
Left          = B = 50
Areas  Width  = C = 370
Areas  Length = D = 225

you have to do this calculation

area=[A,B,A+D,B+C]
area=[100,50,100+225,50+370]

in code

df=read_pdf(folder,area=[[100,50,325,420]] ,output_format="xlsx")

回答4:

Reader only allows measurements if the PDF creator had allowed it. Found this instead: https://graphicdesign.stackexchange.com/a/81666

Brief steps:

Download SumatraPDF. It is also available as zip, no install needed.
Open PDF with the Sumatra reader.
Press 'm' - this shows cursor position in top left corner.
Use tabula with options -p for page, -a for area. (top,left,bottom,right)

来源：https://stackoverflow.com/questions/45457054/tabula-extract-tables-by-area-coordinates

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python

pdf

tabula