MATLAB Central Newsreader - Basic Image Processing

Basic Image Processing

Joe Frank — Mon, 09 Nov 2009 02:29:02 -0500

Hello,

I have two images im1 and im2

im1 is 1200x1 matrix
im2 is 1450x1 matrix

I need to add im1 and im2 for further calculation. How do I do it?

Thanks,
Joe

Re: Basic Image Processing

Nasser M. Abbasi — Mon, 09 Nov 2009 02:54:51 -0500

"Joe Frank" <sascod@gmail.com> wrote in message
news:hd7upe$aep$1@fred.mathworks.com...
> Hello,
>
> I have two images im1 and im2
>
> im1 is 1200x1 matrix
> im2 is 1450x1 matrix
>
> I need to add im1 and im2 for further calculation. How do I do it?
>
> Thanks,
> Joe

if you have Image Processing Toolbox, then do

help imadd

IMADD Add two images or add constant to image.

--Nasser
ps. strange image sizes you have there.

Re: Basic Image Processing

Joe Frank — Mon, 09 Nov 2009 03:17:02 -0500

"Nasser M. Abbasi" <nma@12000.org> wrote in message <1wLJm.2056$cd7.1349@newsfe04.iad>...
>
> "Joe Frank" <sascod@gmail.com> wrote in message
> news:hd7upe$aep$1@fred.mathworks.com...
> > Hello,
> >
> > I have two images im1 and im2
> >
> > im1 is 1200x1 matrix
> > im2 is 1450x1 matrix
> >
> > I need to add im1 and im2 for further calculation. How do I do it?
> >
> > Thanks,
> > Joe
>
>
> if you have Image Processing Toolbox, then do
>
> help imadd
>
> IMADD Add two images or add constant to image.
>
> --Nasser
> ps. strange image sizes you have there.
>

I dont have Image Processing Toolbox. In what other ways I can add them?

ps. I just gave an example. Its not the actual image size.

Thanks

Re: Basic Image Processing

Nasser M. Abbasi — Mon, 09 Nov 2009 03:32:11 -0500

"Joe Frank" <sascod@gmail.com> wrote in message
news:hd81je$2b7$1@fred.mathworks.com...

>
> I dont have Image Processing Toolbox. In what other ways I can add them?
>

Joe;

This toolbox comes with the student version. if you are student it should be
there unless you have an old version of matlab. type 'ver' to find out.

if you'r not student, you can buy this toolbox from Mathworks and add it to
your installation.

if you do lots of image processing, it is very useful.

--Nasser

Re: Basic Image Processing

Sanjeet kumar — Mon, 09 Nov 2009 05:07:03 -0500

if you don't have IP tool box then u can simply add the two images by matrix addition.
make two for loop
one for top to bottp pixels and one for left two right pixel
i.e, (x,y)
then you can add each pixel intensities
like im3(x,y)=im1(x,y)+im2(x,y)
hence you will get a new matrix which will be addition of the first two images

Re: Basic Image Processing

Jan Simon — Mon, 09 Nov 2009 09:18:02 -0500

Dear Joe!

> I have two images im1 and im2
>
> im1 is 1200x1 matrix
> im2 is 1450x1 matrix
>
> I need to add im1 and im2 for further calculation. How do I do it?

This depends on how you define "add".

1. If you want to rescale the images at first, use INTERP1 for one of the images such that both images have the same size afterwards. For more usual 2D images, try INTERP2.

2. If you want to crop one of the images instead, do this.

3. If "add" means something like "add", simply add the arrays.
If image addition meanse an averaging, divide the result by 2.

Good luck, Jan