how can i creat image from data?

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Sanaa
Sanaa 2016-8-22
评论： Image Analyst 2016-8-26
hi I'm beginner in matlab my problem is how to get image.i have text data (row,col) and i want to create image from this data, and this image should be like fringes (dark and white line)

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回答（2 个）

Farouk Moukaddem
Farouk Moukaddem 2016-8-26
Hi,
Refer to the following documentation link for the "mat2gray" command that is used to convert a matrix to a grayscale image:
http://www.mathworks.com/help/images/ref/mat2gray.html
You will also find an example in the above link that will help you get started with Image Processing applications.
Best,
Farouk
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Sanaa
Sanaa 2016-8-26
Hi sir Thanks for replying but I have data not image according to your link I should read the image for my case I didn't have ,I got results and that's results is text file contain four cols (r,theta,phi,intensity) and I should generate image like sphere (like ball) Thanks

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Image Analyst
Image Analyst 2016-8-26
Try this (untested):
% In advance, read your text data into three vectors,
% rows and columns and grayLevels. Then...
lastRow = max(rows);
lastCol = max(columns);
grayImage = zeros(lastRow, lastCol, 'uint8');
for k = 1 : length(rows)
grayImage(rows(k), columns(k)) = grayLevels(k);
end
This assumes that rows and columns are integers.
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Sanaa
Sanaa 2016-8-26
I tried also this code but it isn't work,
clc
clear;
fid = fopen('fort (1).130');
tline = fgets(fid);
out=[];
while ischar(tline)
a=sscanf(tline,' The Time-averaged Poyntine vector(W/m*m) at point: %f');
tline = fgets(fid);
[b c]=sscanf(tline,'%f %f');
tline = fgets(fid);
[d]=sscanf(tline,' Psca %f');
tline = fgets(fid);
out=[out;a b(1) b(2) d];
end
fclose(fid);
% load ('out.mat')
r= out(:,1);
theta= out(:,2);
phi= out(:,3);
I= out(:,4);
theta_new=theta.*180./pi;
for i=1:length(theta_new)
r_a=r(i);
theta_new_a=theta_new(i);
phi_a=phi(i);
x = r(i) .* cos(phi(i)) .* cos(theta_new(i));
y = r(i) .* cos(phi(i)) .* sin(theta_new(i));
% z = r_a .* sin(phi_a);
I(x,y)=I(i);
% x = rcosthetasinphi
% y = rsinthetasinphi
% z = rcosphi.
%
%
end
I=uint8(I);
imshow(I)
Image Analyst
Image Analyst 2016-8-26
I think you overlooked the last line of my answer. Here it is again:
And THIS LINK and attach your data file if you want us to try to run your code.
Not really sure why you did not attach your data -- did you just forget, or am I to just assume that you don't want us to run your code with your data?

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