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From: ImageAnalyst on 10 Mar 2010 21:52
On Mar 10, 6:41 pm, "yusuf awal" <awaludin...(a)yahoo.com> wrote:
> Hi Przemo,
> Thanks for your suggestion. unfortunately I don't have imfilter and   roifilt2 function, since I am using Matlab R2007a. any alternative for that?
>
> thanks
>
> ysf
------------------------------------------------------------------------------------------------------
Depends on what you want to do. Masking can be something as simple as
setting a region to zero if you're going to do something like
thresholding. Like this:

matrixX = uint8(254 * rand(250, 52)+1)
row1 = 60;
row2 = 90;
col1 = 2;
col2 = 7;
matrixX(row1:row2, col1:col2)
subplot(1,2, 1);
image(matrixX);
set(gcf, 'Position', get(0,'Screensize')); % Maximize figure.
title('Original 250x52 Array');
maskedMatrixX = matrixX; % Make it a copy, at first.
% Now do the masking - make it zero in the mask region.
maskedMatrixX(row1:row2, col1:col2) = 0;
subplot(1,2, 2);
image(maskedMatrixX);
% axis 'square';
title('Masked Array');

From: yusuf awal on 13 Mar 2010 00:14
Many thanks ImageAnalyst,
I understand how to create a mask now.
cheers

ImageAnalyst <imageanalyst(a)mailinator.com> wrote in message <eb829c2d-0222-45a8-b515-bdd65f26e2c4(a)z35g2000yqd.googlegroups.com>...
> On Mar 10, 6:41 pm, "yusuf awal" <awaludin...(a)yahoo.com> wrote:
> > Hi Przemo,
> > Thanks for your suggestion. unfortunately I don't have imfilter and roifilt2 function, since I am using Matlab R2007a. any alternative for that?
> >
> > thanks
> >
> > ysf
> ------------------------------------------------------------------------------------------------------
> Depends on what you want to do. Masking can be something as simple as
> setting a region to zero if you're going to do something like
> thresholding. Like this:
>
> matrixX = uint8(254 * rand(250, 52)+1)
> row1 = 60;
> row2 = 90;
> col1 = 2;
> col2 = 7;
> matrixX(row1:row2, col1:col2)
> subplot(1,2, 1);
> image(matrixX);
> set(gcf, 'Position', get(0,'Screensize')); % Maximize figure.
> title('Original 250x52 Array');
> maskedMatrixX = matrixX; % Make it a copy, at first.
> % Now do the masking - make it zero in the mask region.
> maskedMatrixX(row1:row2, col1:col2) = 0;
> subplot(1,2, 2);
> image(maskedMatrixX);
> % axis 'square';
> title('Masked Array');
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