I wrote a plugin to correct such distortion by drawing two paths:

Here is a sample I ran on the page you provided:

I had to use it twice, once to correct the horizontal page bending, and
once to correct the camera barreling after rotating the image.

-Rob A>

On Thu, Mar 21, 2013 at 11:35 AM, Mario Valle <mva...@cscs.ch> wrote:

> The new cage tool is fantastic to solve the following problem, but I need
> suggestions how to be more effective.
> I take a photo with the smartphone of a book page. I need two hands for
> this. The page does not lies flat (see https://dl.dropbox.com/u/**
> 2571325/before.jpg <https://dl.dropbox.com/u/2571325/before.jpg>) because
> no more hands available to keep the page flat (and no glass sheet at
> hand...). Using the cage tool with 3 nodes above and 3 below the text
> produces an acceptable result (see https://dl.dropbox.com/u/**
> 2571325/after.jpg <https://dl.dropbox.com/u/2571325/after.jpg>).
> Question: Is there any better method? Any GIMP plugin or even Android app
> to solve this problem?
> I can trace the deformed rectangle that enclose the page text, but then I
> don't know how to pass this info to the cage tool and ask to make it a real
> rectangle.
> Thanks for your help!
>                                 mario
> --
> Ing. Mario Valle
> Swiss National Supercomputing Centre (CSCS) | http://mariovalle.name/
> v. Trevano 131, 6900 Lugano, Switzerland    | Tel: +41 (91) 610.82.60
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