Photo paper texture problem

[proxy]

I don't normally have a problem getting rid of paper texture but this has me stumped. The original was scanned at 1200dpi 48 bit RGB on an Epson 3170. Any help would be much appreciated.

[Duv]

As a starting point, try the Fournier Transform Filter. You can download from the Alex Chirokov website. On your image, most of the stars to remove seem to be centred close to the centre star that you don't want to touch.

Cheers
Dave

[LUIS A GUEVARA]

Originally Posted by Duv

As a starting point, try the Fournier Transform Filter. You can download from the Alex Chirokov website. On your image, most of the stars to remove seem to be centred close to the centre star that you don't want to touch.

Cheers
Dave

The proper name is the FOURIER Transform . This transform will convert your image into a Graph of the component sinusoids of the original image in the Frequency Domain , where you can easily pinpoint the offending Pattern Frequency and reduce it to zero, thus eliminating it. After that , all it takes , in principle , is to do an INVERSE Fourier Transform , to bring the Fourier Spectrum back to the Spatial Domain as an intelligible image that has no pattern in it.

The Alex Chirokov filter is nowhere to be found and if you do find it it will not work in current Computers . A better solution is to use Matlab and Photoshop to do it under full control. You can read about the Matlab Photoshop connection here.

[Tony W]

Originally Posted by LUIS A GUEVARA

The Alex Chirokov filter is nowhere to be found and if you do find it it will not work in current Computers . A better solution is to use Matlab and Photoshop to do it under full control. You can read about the Matlab Photoshop connection here.

The Alex Chirokov filter can be found in several links - for example http://www.3d4x.ch/?c=16,35

AFAIK it will work on current computers (PC) as a plug in to Photoshop (I am using it with CS4). Cannot comment about the Matlab assume this is a commercial product that has to be paid for.

[TommyO]

I'm not sure why Luis opened a five year old thread to state that... but Tony you are correct. The Alex Chirokov filter still works just fine and is available from several updated websites today. Readers can just do a search here on RP. There are also several other new FFT filters available on the web, one of which is java based and works stand-alone.

Resources:

A tutorial on the Alexandre V. Chirokov FFT filter.
http://www.skeller.ch/ps/fft_action.php

A very nice article by Skeller.


Meesoft’s Image Analyzer
http://meesoft.logicnet.dk/

Works as a stand-alone application. Simply open the file, click on operations>transformations>Fourier transform , paint out the offending frequencies, then inverse by clicking on operations>transformations>Inverse Fourier transform.


ImageJ – Image Processing and Analysis in Java
http://rsbweb.nih.gov/ij/index.html

A stand-alone java based tool with an FFT plug-in. Download the application, then click on the plug-ins>filters>FFT Filter link to obtain the FFT filter. Possibly more technical and confusing to use. But with any tool, the more you use it the easier it gets.

[Tony W]

Originally Posted by TommyO

I'm not sure why Luis opened a five year old thread to state that...

Oops - did not notice the date of the original thread. But thanks Tommy for the links - something else for me to study

[Cupcake]

Old thread, but
good Practice on this picture.