Matlab Image Processing Help

[jpr105]

Dear Forum Members,

I have been given a set of images with objects bounded by a yellow box. I need to be able to find the yellow boxes within the images in order to find the centre of the objects. Is there a function built in to matlab that can find boundaries of a certain colour whilst giving the pixel indices? Or any ideas on a way to tackle this would be much appreciated!

Many thanks,

J

 

[IRstuff]

Homework posting is not allowed

TTFN

 

[jpr105]

It is not part of any homework, it is part of research I am doing and I am struggling to think of a way to do this efficiently since I do not know Matlab well enough.

I am just trying to find functions with this capability or methods that would be able to do this.

 

[IRstuff]

You need to have the image processing toolbox, otherwise, you're simply going to have to brute-force the algorithm.

TTFN

 

[jpr105]

I do have the image processing toolbox but since I am fairly new to Matlab I am unaware of how this can be useful. Could you please provide more details?

 

[IRstuff]

OK, then start using the help file, starting with "roicolor"

Is this project for school?

TTFN

 

[jpr105]

ok, so I can set the region of intensity that yellow lies between. Is there a function that can do this using RGB values?

This is not for school, it is part of a research project for my Masters. The problem is simply my knowledge of Matlab and the functions built in.

 

[IRstuff]

So, you either figure out the individual RGB ranges to filter for and AND them, or you look up RGB2IND in the help file and try that.

TTFN

 

[jpr105]

Ok,

Many thanks for your help.

J