how to plot multiple images (separately) in one window
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Fatma Nur Disci
am 29 Dez. 2020
Kommentiert: Adam Danz
am 30 Dez. 2020
Hi everyone,
I have 2304x1024 matrix. I assume that each 3 rows of this matrix describe an image.(so I have 768 images and each image size = 3x1024 ).
Let's assume that imagesc(1:3, 1024 ) gives the first image, imagesc(4:6,1024) describes the second one and so on.
My code is here :
for ind=1:768
start= (ind-1)*3+1;
stop=ind*3;
data = wholedata(start:stop,:);
imagesc(data); %%%% or pcolor(data) or %%%% I = mat2gray(data) and imshow(I)
end
When I use plot instead of imagesc I can plot multiple graphs in one figure :
figure
for ind=1:768
start= (ind-1)*3+1;
stop=ind*3;
data = wholedata(start:stop,:);
subplot(1,768,ind);
plot(data);
hold on;
end
I want to display images not graphs.
How to plot multiple images side by side in 1x768 format in a figure for example ? Or 32x24 format in a figure?
Thanks for your help.
2 Kommentare
Image Analyst
am 30 Dez. 2020
Bearbeitet: Image Analyst
am 30 Dez. 2020
You aren't really going to display 768 images side by side across your display are you? Each image or plot would be only a pixel or two wide! Even if you did
subplot(28, 28, ind);
they'd still be pretty tiny!
If your screen is in a 9x16 aspect ratio, you can say (9*r) * (16*r) = 768, or r=2.3 and your subplot would look like
subplot(21, 37, ind);
Adam Danz
am 30 Dez. 2020
...or use tiledlayout('flow') and let Matlab arrange the plots for you. But even that has problems as I illustrated in my answer.
Akzeptierte Antwort
KALYAN ACHARJYA
am 29 Dez. 2020
Bearbeitet: KALYAN ACHARJYA
am 29 Dez. 2020
"How to plot multiple images side by side in 1x768 format in a figure for example?"
I assumed that you want to divide the data into several subsections. Plots display data in the same axes, while imageshows or images can display with a concatenation (horizontal or vertical). Although you can arrange 2D individual planes in a 3D vector.
If plots multiple subdivisions from image or matrix data, in this case you can follow-
1st way: If you are looking for plot sections of the data matrix differently, you have follow the following ways, please set the subplot subwindows number accordingly
data=randi([0,255],[2304,1024]);
data_blocks=mat2cell(data,3*ones(1,768),1024);
for i=1:length(data_blocks)
subplot(6,128,i), imagesc(data_blocks{i})
end
2nd way: Directly access the indices using loop
data=randi([0,255],[2304,1024]);
for i=1:3:2304
subplot(....),imagesc(data(i:i+2,:))
end
Note: Please note on the large numbers of figures/plots
3 Kommentare
KALYAN ACHARJYA
am 29 Dez. 2020
"I have 2304x1024 matrix. I assume that each 3 rows of this matrix describe an image.(so I have 768 images and each image size = 3x1024 )."
You can set the tile layout (subplot) as per total window display, please do the changes as per requirements
6x128=768, see the subplot function
If you are using MATLAB version 2019b or latest, you can use title function
https://www.mathworks.com/help/matlab/ref/tiledlayout.html
Weitere Antworten (1)
Adam Danz
am 29 Dez. 2020
768 independent axes on a figure will likely be problematicm, specifically the memory needed and the tiny size of each axis.
To demonstrate, the code below creates all 768 axes but I had to stop it after 551 axes because it was taking too long to add another axes (scroll down for more advice).
wholedata = rand(2304,1024);
nImages = size(wholedata,1)/3;
assert(mod(nImages,1)==0, 'The number of rows of data does not agree with number of images.')
data3D = reshape(wholedata',size(wholedata,2),3,[]);
fig = figure();
tlo = tiledlayout(fig,'flow','TileSpacing','compact','Padding','compact');
for i = 1:size(data3D,3)
ax = nexttile(tlo);
imagesc(ax,data3D(:,:,i)')
end
![](https://www.mathworks.com/matlabcentral/answers/uploaded_files/473908/image.png)
Why not keep your image data together in its original 2304x1024 array?
figure()
imagesc(wholedata)
If you want to show the border between every 3rd row,
h=arrayfun(@(y)yline(y,'w-'),.5:3:size(data,1));
but that will add a lot of lines to the image.
2 Kommentare
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