Solved

Graphic filters

Posted on 2000-03-24
21
207 Views
Last Modified: 2010-04-06
I would like to know if there is a web site where I could find algorithms about graphic filters. Or, if someone knows about some it would be very nice.

Thanks!
0
Comment
Question by:fmichaud061597
  • 8
  • 4
  • 3
  • +5
21 Comments
 
LVL 3

Expert Comment

by:Alisher_N
ID: 2656233
0
 

Author Comment

by:fmichaud061597
ID: 2656505
It's not what I am looking for. I want filters like Sobel, prewit, Sepia, etc.
0
 
LVL 3

Expert Comment

by:eal4
ID: 2659092
Here is one site;
http://pico.i-us.com/filters/ffcategories.htm

Go to this search engine and type in "Graphics Filters", the site list is long.
0
 
LVL 3

Expert Comment

by:eal4
ID: 2659093
Naturally you need the engine address!!!
http://infind.inference.com
0
 

Author Comment

by:fmichaud061597
ID: 2659177
Adjusted points from 100 to 500
0
 

Author Comment

by:fmichaud061597
ID: 2659178
These links were useless. I asked about web sites where I could find graphic filters algorithms not plug-ins for photoshop. I don't have time to make researches on the web.

I need only 3 filters. Not sobel or prewit please.
0
 
LVL 2

Expert Comment

by:gikam
ID: 2659646
0
 
LVL 2

Expert Comment

by:fremsley
ID: 2660543
you might go to

  http://www.gimp.org/

and download the source code of the gimp, a graphics manipulation program with many filters.
0
 
LVL 3

Expert Comment

by:eal4
ID: 2661403
If you don't have time to search the web, what makes you think that we have an abundance of time to do it for you?
0
 

Author Comment

by:fmichaud061597
ID: 2661493
eal4: I tought someone else could have some algorithms on his computer. I never told that someone else should do search for me.
0
Is Your Active Directory as Secure as You Think?

More than 75% of all records are compromised because of the loss or theft of a privileged credential. Experts have been exploring Active Directory infrastructure to identify key threats and establish best practices for keeping data safe. Attend this month’s webinar to learn more.

 
LVL 2

Expert Comment

by:gikam
ID: 2663042
did u try my link?
0
 

Expert Comment

by:TSMITH
ID: 2672524
I know you were in a rush to get the algorithms. Are you still interested?

I know Prewitt and Sobel and have researched thier variations. If you want in-depth explinations, would you want algorithms in C code, pseudo, or just explained in plain English?

Hope I can help
0
 
LVL 10

Expert Comment

by:Lischke
ID: 2689179
This one is perhaps what you are looking for:

http://www.efg2.com/lab/

Ciao, Mike
0
 
LVL 1

Expert Comment

by:hewey01
ID: 2732380
fmichaud :

O.k., I don´t know where are you planning to use the filters, but the main mathmatical algorithm fore some of the filters u asked for are:

Derivative Filters:

Roberts:  

            1  0
            0 -1

or:
             0  1
            -1  0


Prewitt:

          -1 -1 -1
           0  0  0
           1  1  1

or:
           -1 0 1
           -1 0 1
           -1 0 1

Sobel:


          -1 -1 -1
           0  0  0
           1  2  1

or:
          -1 0 1
          -2 0 2
          -1 0 1

You must apply this matrix to all of your image matrix by simple multiplication. The boundaries of the image remain the same.

If I was of help, and you need more you can contact me.

Also I would like to know where are you planning to use them so I can give you more info.
0
 

Author Comment

by:fmichaud061597
ID: 2732433
I said that I don't need Prewit nor Sobel filters.
0
 
LVL 1

Expert Comment

by:hewey01
ID: 2732492
fmichaud :

So why you answered Alisher_N  that you wanted Prewit an Sobel filters? (comment #2) O.k. I read the other comment where you say you don´t want them! sorry!

What kind of filters do you want? So I can send them to you if I have them.

HEWEY
0
 
LVL 1

Expert Comment

by:hewey01
ID: 2732508
fmichaud:

Do you care if they are in the frecuency domain?
0
 

Author Comment

by:fmichaud061597
ID: 2732572
I said that I don't need Prewit nor Sobel filters.
0
 

Author Comment

by:fmichaud061597
ID: 2732579
Sorry for the last post. It was an error.

My work on filters is now done.
0
 
LVL 1

Accepted Solution

by:
hewey01 earned 500 total points
ID: 2737143
O.k., good luck fmichaud, if can help you some other time, i´ll be glad.

HEWEY
0
 

Author Comment

by:fmichaud061597
ID: 2771596
Ok, thank you! Here are the points!
0

Featured Post

Is Your Active Directory as Secure as You Think?

More than 75% of all records are compromised because of the loss or theft of a privileged credential. Experts have been exploring Active Directory infrastructure to identify key threats and establish best practices for keeping data safe. Attend this month’s webinar to learn more.

Question has a verified solution.

If you are experiencing a similar issue, please ask a related question

Suggested Solutions

Title # Comments Views Activity
edit mp4 file 10 88
Looking for a free software that saves Name Signature drawing to video file 1 69
Saving html pages from the web 5 86
Need icon art 9 96
Keep your audience engaged and get the most out of your next presentation with these quick Prezi tips.
Technology opened people to different means of presenting information, but PowerPoint remains to be above competition. Know why PPT still works today.
In this second Micro Tutorial in the series,  viewers will learn more basic shortcuts and functions of Illustrator. In this tutorial you will learn about the eyedropper tool, zoom , ellipses and more.
Learn how to set up basic frames and paths in Prezi and understand the open space that Prezi allows you to create presentations in.

911 members asked questions and received personalized solutions in the past 7 days.

Join the community of 500,000 technology professionals and ask your questions.

Join & Ask a Question

Need Help in Real-Time?

Connect with top rated Experts

16 Experts available now in Live!

Get 1:1 Help Now