ValueError: setting an array element with a sequence.

[braddockcg]

On some images, rpred and rtrain's dewarp function throws an error because the padding is insufficient. This seems to be particularly true of images which have borders or other noise near the top and bottom edges. Attached is an example.

I have a simple, but unsatisfying, fix for this where I double the amount of padding. See my github fork commit (branch bugfix) at:
braddockcg@be2e6d1

The full error is:

Traceback (most recent call last):
File "/usr/local/bin/ocropus-rpred", line 245, in safe_process1
return process1(arg)
File "/usr/local/bin/ocropus-rpred", line 145, in process1
line = lnorm.normalize(line,cval=amax(line))
File "/usr/local/lib/python2.7/dist-packages/ocrolib/lineest.py", line 59, in normalize
dewarped = self.dewarp(img,cval=cval,dtype=dtype)
File "/usr/local/lib/python2.7/dist-packages/ocrolib/lineest.py", line 56, in dewarp
dewarped = array(dewarped,dtype=dtype).T
ValueError: setting an array element with a sequence.

[tmbdev]

Thanks; I'll look into this again soon, when I get around to cleaning up some of this code.

[zuphilip]

The picture is a color image and it should be just a black/white picture. If you binarize the picture, then the ocropus-rpred is working as it should. It looks that the check, which should prevent that case, is not working correctly.

[zuphilip]

While my comment above is true, it seems that this is more like some coincident and a real fix should somehow increase the padding. I created now another PR #133 extending your idea, which will solves this issue then.

[zuphilip]

Closed by #133