save data in matrix after improfile

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Eva G
Eva G on 4 Oct 2021
Answered: Prachi Kulkarni on 18 Oct 2021
Hi,
I have an image and I would like to get a cross section of it- line intensity profile to evaluate the lines if are equally seperated . I had set improfile at the mid-point of the image and I got the intensity profile. After I would like to save the improfile matlab figure into a matrix and try get from the matrix a specific row for all the columns but I cant find the way to do it.
Please see my code below :
I = imread('Test-0.tif'); %% I have tif files but here I uploaded a jpg
x = [0 size(I,2)];
y = [size(I,1)/2 size(I,1)/2]; %choose the middle y data
improfile(I,x,y);
imshow(I);
figure
M=improfile(I,x,y);
save('data.mat','M');
  3 Comments
Geoff Hayes
Geoff Hayes on 4 Oct 2021
@Eva G - are you sure that the output should be sized differently? Maybe you need to capture the x and y coordinates as indicated here.

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Answers (1)

Prachi Kulkarni
Prachi Kulkarni on 18 Oct 2021
Hi,
In the code snippet you have provided, the pixel values are sampled along only one line segment in image I. The endpoints of this line segment are I(0, size(I,1)/2) and I(size(I,2), size(I,1)/2). Hence, the output variable M is giving a single vector of pixel values along the segment.
To get the profile along multiple horizontal line segments in the image, you will have to generate the profile for all the line segments in a loop and combine their output in a matrix. For example, to get a profile along 3 horizontal lines at the top, middle and bottom, the code would be as follows.
I = imread('Test-0.jpg'); %% I have tif files but here I uploaded a jpg
x = [0 size(I,2)];
M = [];
for yi = [1 size(I,1)/2 size(I,1)]
y = [yi yi]; %choose the middle y data
figure
Mi = improfile(I,x,y);
M = [M ; Mi'];
end
save('data.mat','M');

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