Getting started - simple ocr of A4 pages

[daniel....@gmail.com]

Hi,

I'm attempting to ocr an image, which is of a simple and relatively clear A4 page.
Cuneiform does an ok job, but I'm curious to see if ocropus is better.

I followed the instructions to install on the home page. However, when I do the following from a shell I get some errors.
I type:
ocropus-recognize-book in.png -o out.html

Here is the output I get:
book directory ./_book-017587
in.png -> ./_book-017587/0001.png

=== preprocess

# ocropus-nlbin ./_book-017587/????.png
=== ./_book-017587/0001.png 1
estimating skew angle
estimating thresholds
rescaling
./_book-017587/0001.png lo-hi (0.42 1.45) angle  0.2  no-normalization
writing
Traceback (most recent call last):
  File "/usr/local/bin/ocropus-nlbin", line 181, in <module>
    process1((f,i+1))
  File "/usr/local/bin/ocropus-nlbin", line 161, in process1
    gray()
  File "/usr/lib/pymodules/python2.7/matplotlib/pyplot.py", line 2951, in gray
    im = gci()
  File "/usr/lib/pymodules/python2.7/matplotlib/pyplot.py", line 217, in gci
    return gcf()._gci()
  File "/usr/lib/pymodules/python2.7/matplotlib/pyplot.py", line 369, in gcf
    return figure()
  File "/usr/lib/pymodules/python2.7/matplotlib/pyplot.py", line 343, in figure
    **kwargs)
  File "/usr/lib/pymodules/python2.7/matplotlib/backends/backend_tkagg.py", line 80, in new_figure_manager
    window = Tk.Tk()
  File "/usr/lib/python2.7/lib-tk/Tkinter.py", line 1688, in __init__
    self.tk = _tkinter.create(screenName, baseName, className, interactive, wantobjects, useTk, sync, use)
_tkinter.TclError: no display name and no $DISPLAY environment variable
Traceback (most recent call last):
  File "/usr/local/bin/ocropus-recognize-book", line 73, in <module>
    run(args.preproc,book+"/????.png")
  File "/usr/local/bin/ocropus-recognize-book", line 57, in run
    assert subprocess.call(args)==0
AssertionError

If anyone can help me overcome these errors that would be greatly appreciated. I can not seem to find any output text at the moment from this operation.

Thanks in advance,
Dan

[Sriranga(78yrsold)]

Have you checked with the "Issues"  of http://code.google.com/p/ocropus/issues/list ?
Presumed  you are testing with English lang or else?  Better to post under "issues" with attached sample image.

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[Daniel Dalton]

On Tue, Jan 22, 2013 at 12:32:59PM +0530, Sriranga(78yrsold) wrote:
> Have you checked with the "Issues"� of

> [1]http://code.google.com/p/ocropus/issues/list ?

> Presumed� you are testing with English lang or else?� Better to post under
> "issues" with attached sample image.

Thanks. Ok, I solved that first problem. Now I either get a blank
output.html file for some images or assertion errors in other
cases. I'll examine that page again though.
Here are the assertion errors:
daniel@vostro-3350:~/Documents$ ocropus-recognize-book letter_monash.png
-o output1.html
book directory ./_book-008701
letter_monash.png -> ./_book-008701/0001.png

=== preprocess

# ocropus-nlbin ./_book-008701/????.png
=== ./_book-008701/0001.png 1

estimating skew angle
estimating thresholds
rescaling

./_book-008701/0001.png lo-hi (0.00 1.00) angle 0.0 no-normalization
writing

=== page segmentation

# ocropus-gpageseg ./_book-008701/????.bin.png
./_book-008701/0001.bin.png
./_book-008701/0001.bin.png: scale (5.91608) less than --minscale;
skipping

=== line recognition

# ocropus-lattices ./_book-008701/????/??????.bin.png

Traceback (most recent call last):

File "/usr/local/bin/ocropus-lattices", line 56, in <module>
args.files = ocrolib.glob_all(args.files)
File "/usr/local/lib/python2.7/dist-packages/ocrolib/toplevel.py",
line 204, in argument_checks
result = f(*args,**kw)
File "/usr/local/lib/python2.7/dist-packages/ocrolib/common.py", line
509, in glob_all
raise Exception("%s: expansion did not yield any files"%arg)
Exception: ./_book-008701/????/??????.bin.png: expansion did not yield
any files

Traceback (most recent call last):

File "/usr/local/bin/ocropus-recognize-book", line 79, in <module>
run(args.linerec,book+"/????/??????.bin.png",m=args.model)

File "/usr/local/bin/ocropus-recognize-book", line 57, in run
assert subprocess.call(args)==0
AssertionError

Thanks for your help.

Dan

[Angelica]

Did you manage to solve the assertion problem? I'm getting the same output..

[Nathan K]

Looks like the image is to small, causing no output. Thus subsequent stages will fail. 

# ocropus-gpageseg ./_book-008701/????.bin.png
./_book-008701/0001.bin.png
./_book-008701/0001.bin.png: scale (5.91608) less than --minscale;
skipping

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[Tom]

You need to run OCRopus under an X11 window system (this is the default under Ubuntu), otherwise the various display functions used by the numerical libraries will not be able to initialize.

Tom