Question

mapping of dat into image

Asked by: matlablearner

hi there,
i would like to know how i can map the data into the image,
thanks

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Asked On
2009-07-20 at 10:54:17ID24584899
Topics

3D Game Programming

,

MatLab Programming Language

Participating Experts
2
Points
500
Comments
16

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Answers

 

by: ozoPosted on 2009-07-20 at 12:09:23ID: 24897961

what data, what mapping, and what image?

 

by: matlablearnerPosted on 2009-07-20 at 12:12:20ID: 24897994

i have a signature image  and i have online data from the
signature what i want to do is map the online data into the
the signature image and be able to see where the particular
data lies in the image.
sorry about confusion

 

by: ozoPosted on 2009-07-20 at 12:26:26ID: 24898116

it sounds like you want to perform a convolution or cross-correlation

 

by: matlablearnerPosted on 2009-07-20 at 12:28:09ID: 24898130

yes, i want to cross correlation, is there any function for that..
thank you

 

by: ozoPosted on 2009-07-20 at 12:40:36ID: 24898241

cross correlation is equivalent to a convolution of a reversed image,
and if you make a periodic extension of the images, you can use a Fast Fourier transform to compute the convolution

 

by: matlablearnerPosted on 2009-07-20 at 12:43:25ID: 24898271

well thanks for the help but i am new to matlab so it would be
gr8 if you could show me in coding and description. thanks

 

by: ozoPosted on 2009-07-20 at 12:52:00ID: 24898365

Sorry I didn't see you mention matlab before.
I am unfamiliar with how one would code a Fast Fourier Transform in matlab

 

by: ozoPosted on 2009-07-20 at 12:54:32ID: 24898387

You may want to add the  MatLab Programming Zone to your question
http://www.experts-exchange.com/Programming/Languages/MatLab/

 

by: yuk99Posted on 2009-07-21 at 13:07:46ID: 24908776

 

by: yuk99Posted on 2009-07-21 at 13:09:19ID: 24908794

 

by: matlablearnerPosted on 2009-07-21 at 13:25:05ID: 24908953

i did some research on convolution myself aswell and i found
that its not that what i want to do.
i would like to explain what i am trying to do.

I have a signature image and seperate information of x and y
cordinates in txt file.
i have found out the x and y cordinates from the signature
image itself now what i want to do is mapp the x and y
cordinates of the txt file to the signature image plot it as graph .
hope these information will help you guys to give me some idea
i can implement that.
thanks a lot

 

by: yuk99Posted on 2009-07-21 at 13:50:30ID: 24909196

Not sure I understand you correctly.
Do you want to see particular pixels with defined x-y coordinate on your image? If so, you probably need to use SUB2IND function:
http://www.mathworks.com/access/helpdesk/help/techdoc/ref/sub2ind.html
Than you can use the returned index to do something with either those pixels, or the rest of image.

What kind of graph you want to plot? Can you give an example? May be you can attach your signature image (or part of it) for clarity? And an example of data in the text file?

 

by: yuk99Posted on 2009-07-21 at 22:32:28ID: 24911766

Ok, I've got it. Cannot help much with mapping.
Following the above discussion, to do cross correlation you may try to use xcorr2 function in Signal Processing Toolbox.
To do convolution and FFT try conv2 and fft2.

To import and plot your coordinate you can use the code below. (I converted docx to txt.)
Sorry if it's not what you wanted.

data=dlmread('1.txt',' ',23,0);
plot(data(:,2),data(:,3),'k-')
axis image
axis off
set(gca,'Position',[0 0 1 1])
set(gcf,'color','w')
 
% to fit figure size to axes
pba=pbaspect(gca);
set(gcf, 'units', 'pixels');
fpos=get(gcf,'position');
fpos(4)=fpos(3)*pba(2)/pba(1);
set(gcf,'position',fpos)
 
% in case you need to get image from that plot
M=getframe(gca);
% to show it as image
imshow(M.cdata)
                                              
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