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# how can i zero pad of an image(vein) to make it look like a cylinder

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Oluwatobi Adeyemi on 23 Jan 2020
Closed: MATLAB Answer Bot on 20 Aug 2021
I have an image that i want to pad the volume until it looks like a cylinder! Then when i rotate it by 90 deg it wont look like a lot of long lines but only a lot of short lines.
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Oluwatobi Adeyemi on 29 Jan 2020
i have an MIP image i want to rotate but i want it to look more like a cylinder instead of a line when i rotate it

Nikhil Sonavane on 30 Jan 2020
If you have the Image Processing ToolBox you can use the function PADARRAY. For example if I wanted to pad 2 zeroes around the matrix:
A = [1 2; 3 4];
B = [5 6; 7 8];
C = cat(3,A,B); % 3D matrix
If you do not have the toolbox you could work around by by writing a few extra lines of code:
A = [1 2; 3 4];
B = [5 6; 7 8];
C = cat(3,A,B); % 3D matrix
vec= size(C); %Storing the dimensions of the a3d matrix
vec= vec+4; %Increasing the dimensions depending upon the number of zeroes to be padded.
paddedMatrix = zeros(vec); %Creating an empty matrix with new dimensions
paddedMatrix(3:end-2,3:end-2,3:end-2)=C; %Putting C into the empty matrix.
You can also refer to the documentation of Volume Viewer App if it helps resolve your query.
Oluwatobi Adeyemi on 30 Jan 2020
the volume viewers app really help thanks

R2018a

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