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Grandpa Benny
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Mogens_Bohl_P


Junior Member

Registered: June 2002
Location: Vest-Sjaelland (West Zealand), Denmark
Posts: 3
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I notised the text on sign in the background was mirrored as well as the steering wheel. I imagine it is an american photo and not a british so I simply mirrored the photo as step 1. The mirrored image was used as the "original" image.

In step 2 a subsection of the photo containing the moire pattern was copied to a new grayscale image. A fft (fast fourier transform) plugin in GIMP was used to remove the interference pattern. This was done by removing the spikes in the spectrum resonsible for the pattern. Then a reverse fft was performed and an almost clean image was produced. This subsection was pasted as a new layer on top of the new original. The layers was aligned and flattened.

As step three the image was divided into far background (the house) (blurred by 11 x 11), background with sign and store (blurred a 7 x 7 matrix), a near foreground with the car (blurred with 5 x 5)and finally the foreground with "Grandpa Benny" and the bumper of the car. A montage was made and flattened. The tear of the photo (shadow of car) and trousers was removed. Image flattened and some of the damages to "Grandpa Benny"s head (shadow) were removed/reduced.

All manipulations were done in GIMP on a linux system.
· Date: 7/28/2002 · Views: 9068 · Filesize: 37.2kb, 197.2kb · Dimensions: 1678 x 2498 ·
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Keywords: Restoration Challenge #38
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Ed_L

Senior Member

Registered: August 2001
Location: northwest Indiana, about 45 minutes from Chicago, IL
Posts: 2,824
7/28/2002 5:14pm

Wow! What a difference! Super job on this one, which I won't even download.

Note to Penny:
Welcome to the site. Don't think your efforts aren't worth submitting. If you're having a problem with something, somebody will likely make suggestions on how to improve. It's a lot easier to learn that way, and it's quick too.

Ed

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DJ Dubovsky

Senior Member

Registered: August 2001
Location: Upper Penninsula of Michigan
Posts: 1,659
7/28/2002 5:29pm

Very good catch on the mirrored image. You did great getting the lines out as well. Just seems a bit faded in the bottom of the photo but overall an excellent job.
DJ
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Mom3
Junior Member

Registered: July 2002
7/28/2002 11:37pm

Mogens,

I use PaintShopPro - could you explain the fft in GIMP? Is GIMP a stand alone graphics program?

Excellent results, by the way! I have a few photos with the same problem so I am most interested in a little more detail on GIMP.

Mom3


In step 2 a subsection of the photo containing the moire pattern was copied to a new grayscale image. A fft (fast fourier transform) plugin in GIMP was used to remove the interference pattern. This was done by removing the spikes in the spectrum resonsible for the pattern. Then a reverse fft was performed and an almost clean image was produced. This subsection was pasted as a new layer on top of the new original. The layers was aligned and flattened.


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wishy
Junior Member

Registered: July 2002
Location: UK
Posts: 3
7/29/2002 9:10am

Nice job, Mogens.

Do any of you folks know if there's a comparable method for moire pattern reduction in PS?
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Flora

Senior Member

Registered: March 2002
Location: Milan, Italy
Posts: 2,325
7/29/2002 9:21am

Hi Mogens!

having worked on this picture myself, I know how hard it was....

You really did very well....I had nearly missed the 'mirrored' writing....

------------------------------
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Mogens_Bohl_P
Junior Member

Registered: June 2002
Location: Vest-Sjaelland (West Zealand), Denmark
Posts: 3
7/29/2002 4:50pm

Hi all,

Thanks for your nice remarks about the restoration attempt of "Grandpa Benny". As DJ remarked there is still some work to be done on shadows under the car and some areas around the bumper and his trousers. Tom Willis and Flora did both overall nice jobs as well with the shadows.

Among several links I found a tutorial concerning removal of moire patterns from book and newspaper prints:

http://www.reindeergraphics.com/tuto...fourier13.html

I made a search for "fft fast fourier transforms" and there seem to be plugins for PS as well, but I have not used them.

The GIMP is standalone software and is ported to the Windows platform as well, but I am uncertain if the Gfourier plug-in is ported, but I will look into that.

Mogens
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Tom Willis
Junior Member

Registered: June 2002
Location: Wakefield, Quebec, Canada
7/29/2002 6:34pm

My software, PhotoImpact, has a "Remove Moire" comand but it had no effect - scale is wrong I think. Did it manually but wouldn't want to do it every day. Congratulations on finding a the right tool for this tedious job.

Your approach regarding various levels of blurring for the different "layers" of the photo is interesting and time-saving. Some adjustments to the tonal ranges would help give the photo more presence I think.
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Doug Nelson

Janitor

Registered: August 2001
Posts: 7,068
7/30/2002 10:20am

Very good job. Excellent procedure for removing the lines. Some mottling of tones, but far less than expected.

I'm in conversation with Chris Russ (Reindeer Graphics) about a product that might bring a friendlier face to some of his excellent but complex filters (hopefully including fft).

In the meantime, a Google search for "photoshop fft" comes up with some very interesting pages.

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Mogens_Bohl_P
Junior Member

Registered: June 2002
Location: Vest-Sjaelland (West Zealand), Denmark
Posts: 3
7/30/2002 12:36pm

I have looked around for image manipulation programs ported to several platforms and found another interesting program: ImageJ.
The source code is freely available. The fft plug-ins are worth having a look at. The public domain program ImageJ is found at:
http://rsb.info.nih.gov/ij/index.html

Mogens

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Flora

Senior Member

Registered: March 2002
Location: Milan, Italy
Posts: 2,325
7/30/2002 1:40pm

Mogens, Doug

...Thank you very much for the tip.....

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Nick Carter

Junior Member

Registered: March 2002
Location: Leichhardt, Queensland, Australia
Posts: 12
8/2/2002 5:59pm

H1 Penny
I think the image is very good I'll be using it as a comparison for my own attempt, I have the windows port of 'The Gimp' [stopped using my linux o/s], it hasn't the FFT plug-in
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dwdraw
Junior Member

Registered: February 2003
Location: New York
Posts: 12
3/22/2003 5:48pm

Nice work.

DW

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