Comments on: Relabeling a label matrix

By: Simon Silk

Simon Silk — Sun, 13 Mar 2011 04:17:49 +0000

That worked perfectly. Your function imoverlay from the File Exchange is handy for visualizing the results too. Thanks.

By: Steve

Steve — Fri, 11 Mar 2011 21:05:57 +0000

Simon—Try something like this:

region_borders = imdilate(L,ones(3,3)) > imerode(L,ones(3,3));

By: Simon Silk

Simon Silk — Thu, 10 Mar 2011 20:34:28 +0000

Hi Steve,

I was wondering if there’s an easy way to convert a label matrix into a matrix where you have lines anywhere two labeled regions meet and zeros elsewhere so that you could basically superimpose the borders of regions on the original image the label were generated from as another visualization alternative to the popular label2rgb function.

The reason I ask is that I’m currently working on with some superpixel code, so I have many labeled regions (500 to 5,000). I’ve been using rgblabel to convert the superpixel labels to colored regions, turning hold on, then displaying them over the original image with alphadata turned down to make them semi-transparent. However, with so many regions, this can be hard to analyze visually and I think simple borders of the regions would work better. Thanks.

By: fadhle

fadhle — Fri, 13 Aug 2010 07:35:50 +0000

i have one question here,how can i label the occluded objects,because the output is always 1 even if there are 4 or 5 objects

By: Steve

Steve — Wed, 09 Dec 2009 14:02:26 +0000

kk—Why not find the direction of the two objects and compute the difference? Also, what is the direction of a circle?

By: kk

kk — Wed, 09 Dec 2009 09:25:10 +0000

i have a small doubt, how to find direction of an object with respect to other object present in same image as for example if an image has a rectangle with a square and circle enclosed in it, the circle denotes the front part of rectangle and i have to find its direction with respect to other object present in same image.

By: priya

priya — Mon, 07 Dec 2009 18:07:06 +0000

this code is really helpful

By: Steve

Steve — Mon, 09 Nov 2009 18:22:35 +0000

Piyush;mdash;There’s no good way in MATLAB to render text except via graphics commands into a figure window. However, you can do it into an invisible figure and then use the print function to output to an image file. I don’t know whether the performance will be suitable for you or not.

By: Piyush

Piyush — Sat, 24 Oct 2009 17:59:04 +0000

Hi, I have a labeled matrix but one thing I would like to do is create text labels on the image matrix itself without having to open up a figure and plot text labels on them because I am trying to do it in a parallel process, and have it go really fast. For example I have circles that I am checking for their circularity and I just want to overlay text in the image itself over the circle with the circularity value. Is this possible with the current toolset Matlab provides? If not what is the recommended way to implement this?

Thanks,
Piyush

By: Steve

Steve — Fri, 12 Jun 2009 17:13:58 +0000

Shahn—See this post.