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Thread Subject:
How can I find out if two images are similar with harris corners detector?

Subject: How can I find out if two images are similar with harris corners detector?

From: Salha

Date: 16 Sep, 2008 10:41:02

Message: 1 of 4

Hello Everyone,
I have two images (quite similar but with different angles) that I display. I have used Harris algorithm to detect the corners in both images and then it provides me with the PIP matrices of the detected corners.
So now, I need to compare these detected corners and determine if it was similar or not. However, I have no clue how to start the comparison. Please help!!

**I tried the SSD but i end up with very large numbers in the matrix and it doesn't show if it is similar or not.

Subject: How can I find out if two images are similar with harris corners detector?

From: David

Date: 16 Sep, 2008 11:10:04

Message: 2 of 4

"Salha " <kuwaitisalha@gmail.com> wrote in message <gao2fu$64o$1@fred.mathworks.com>...
> Hello Everyone,
> I have two images (quite similar but with different angles) that I display. I have used Harris algorithm to detect the corners in both images and then it provides me with the PIP matrices of the detected corners.
> So now, I need to compare these detected corners and determine if it was similar or not. However, I have no clue how to start the comparison. Please help!!
>
> **I tried the SSD but i end up with very large numbers in the matrix and it doesn't show if it is similar or not.
>

well, the first step is to define 'similar'.

Subject: How can I find out if two images are similar with harris corners detector?

From: Salha

Date: 17 Sep, 2008 06:25:04

Message: 3 of 4

"David " <dave@bigcompany.com> wrote in message <gao46c$pao$1@fred.mathworks.com>...
> "Salha " <kuwaitisalha@gmail.com> wrote in message <gao2fu$64o$1@fred.mathworks.com>...
> > Hello Everyone,
> > I have two images (quite similar but with different angles) that I display. I have used Harris algorithm to detect the corners in both images and then it provides me with the PIP matrices of the detected corners.
> > So now, I need to compare these detected corners and determine if it was similar or not. However, I have no clue how to start the comparison. Please help!!
> >
> > **I tried the SSD but i end up with very large numbers in the matrix and it doesn't show if it is similar or not.
> >
>
> well, the first step is to define 'similar'.


OK!
I want to find out which of the detected corners in the first image corresponds or is similar to the detected corners in the second image.
I hope it’s clear now!!

Subject: How can I find out if two images are similar with harris corners detector?

From: David

Date: 17 Sep, 2008 11:15:04

Message: 4 of 4

"Salha " <kuwaitisalha@gmail.com> wrote in message <gaq7s0$47n$1@fred.mathworks.com>...
> "David " <dave@bigcompany.com> wrote in message <gao46c$pao$1@fred.mathworks.com>...
> > "Salha " <kuwaitisalha@gmail.com> wrote in message <gao2fu$64o$1@fred.mathworks.com>...
> > > Hello Everyone,
> > > I have two images (quite similar but with different angles) that I display. I have used Harris algorithm to detect the corners in both images and then it provides me with the PIP matrices of the detected corners.
> > > So now, I need to compare these detected corners and determine if it was similar or not. However, I have no clue how to start the comparison. Please help!!
> > >
> > > **I tried the SSD but i end up with very large numbers in the matrix and it doesn't show if it is similar or not.
> > >
> >
> > well, the first step is to define 'similar'.
>
>
> OK!
> I want to find out which of the detected corners in the first image corresponds or is similar to the detected corners in the second image.
> I hope it’s clear now!!

ok, the first step is still to define 'similar'.

then the second step is to figure out how you would do that job without matlab.

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