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How to flatten images of book page

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How to flatten images of book page Mario Valle 21 Mar 15:35
  How to flatten images of book page Rob Antonishen 21 Mar 16:17
   How to flatten images of book page Steve Kinney 21 Mar 21:42
   How to flatten images of book page Mario Valle 22 Mar 03:41
  How to flatten images of book page Liam R E Quin 22 Mar 02:15
Mario Valle
2013-03-21 15:35:16 UTC (about 12 years ago)

How to flatten images of book page

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) 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).

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
Rob Antonishen
2013-03-21 16:17:49 UTC (about 12 years ago)

How to flatten images of book page

I wrote a plugin to correct such distortion by drawing two paths: http://registry.gimp.org/node/19214

Here is a sample I ran on the page you provided: http://www.majhost.com/gallery/ffaat/gimp/more2/corrected.jpg

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 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 ) 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 ).

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 ______________________________**_________________ gimp-user-list mailing list
gimp-user-list@gnome.org
https://mail.gnome.org/**mailman/listinfo/gimp-user-**list

Steve Kinney
2013-03-21 21:42:56 UTC (about 12 years ago)

How to flatten images of book page

On 03/21/2013 12:17 PM, Rob Antonishen wrote:

I wrote a plugin to correct such distortion by drawing two paths: http://registry.gimp.org/node/19214

Here is a sample I ran on the page you provided: http://www.majhost.com/gallery/ffaat/gimp/more2/corrected.jpg

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

Very nice!

In similar cases I have used the Perspective Tool in "Corrective (Backward) mode to square up warped photos-of-photos and documents, sometimes followed by running Filters > Distorts > Lens Distortion against all or part of the image.

The Distortion Correction Between Paths plugin adds another useful tool to the "bent document correction" arsenal; my initial experiments seem to indicate it will be especially effective with photos of pages in books and similar geometries.

:o)

Steve

Liam R E Quin
2013-03-22 02:15:09 UTC (about 12 years ago)

How to flatten images of book page

On Thu, 2013-03-21 at 16:35 +0100, Mario Valle 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.

Don't forget that you probably also have feet...

Liam

Liam Quin - XML Activity Lead, W3C, http://www.w3.org/People/Quin/
Pictures from old books: http://fromoldbooks.org/
Ankh: irc.sorcery.net irc.gnome.org freenode/#xml
Mario Valle
2013-03-22 03:41:01 UTC (about 12 years ago)

How to flatten images of book page

Fantastic! Thanks
The only addition is to run perspective tool afterwards to correct side parallelism.
Thanks again!
mario

On 21-Mar-13 17:17, Rob Antonishen wrote:

I wrote a plugin to correct such distortion by drawing two paths: http://registry.gimp.org/node/19214

Here is a sample I ran on the page you provided: http://www.majhost.com/gallery/ffaat/gimp/more2/corrected.jpg

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 > 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 ) 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 ).

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
_________________________________________________ gimp-user-list mailing list
gimp-user-list@gnome.org
https://mail.gnome.org/__mailman/listinfo/gimp-user-__list 

Ing. Mario Valle
Swiss National Supercomputing Centre (CSCS) | http://mariovalle.name/
v. Trevano 131, 6900 Lugano, Switzerland    | Tel: +41 (91) 610.82.60