How do you add a border to an image?

Lehane · Sep 16, 2011

I am trying to analyse an image in Matlab and need to be able to see the left edge of the image. At the moment I add a 1 pixel border to the image (or just to the left side) in a photo program like Gimp. This is time consuming so I'm looking for a way to get Matlab to add the border for me.

At the moment I use

dispIm = imread(file,'tif');
imshow(dispIm);

Which then opens the image ready for analysis. What code can I add to add the black border?

IRstuff · Sep 16, 2011

so, why not just set the edge rows and columns of the array to the color you want?

TTFN

FAQ731-376
Chinese prisoner wins Nobel Peace Prize

Lehane · Sep 16, 2011

Solved the problem

FeX32 · Sep 16, 2011

good you solved it. Matlab has a computer vision toolbox that may be handy. Will be interesting to see how many CV researchers switch from C to Matlab because of it. Open CV is still a good resource though.

[peace]

Fe

flash3780 · Oct 16, 2011

You could use ImageMagick to add borders to your outputs. For Linux:

Code:

clear;clc;close all;
A = [0.866-0.5*i, 0.866+0.5*i, 0.000+1,0*i]'
h = figure(1);
compass(A)
W = 4; H = 3;
set(h,'PaperUnits','inches')
set(h,'PaperOrientation','portrait');
set(h,'PaperSize',[H,W])
set(h,'PaperPosition',[0,0,W,H])
FN = findall(h,'-property','FontName');
set(FN,'FontName','/usr/share/fonts/dejavu/DejaVuSerifCondensed.ttf');
FS = findall(h,'-property','FontSize');
set(FS,'FontSize',6);
print(h,'-dpng','bordertest.png');
system('convert bordertest.png -bordercolor green -border 10x10 bordertest.png')

In Windows, convert has some issues... but here is a discussion of how to get ImageMagick convert working in Windows:

http://savage.net.au/ImageMagick/html/install-convert.html

//signed//
Christopher K. Hubley
Mechanical Engineer
Sunpower Incorporated
Athens, Ohio

flash3780 · Oct 16, 2011

I forgot in the previous post: The result of the above code is attached. Also, the important line from the above example is:

Code:

system('convert bordertest.png -bordercolor green -border 10x10 bordertest.png')

Clearly, you could change the border color to whatever you'd like.

//signed//
Christopher K. Hubley
Mechanical Engineer
Sunpower Incorporated
Athens, Ohio

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