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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
Oluwatobi Adeyemi 2020-1-23
关闭： MATLAB Answer Bot 2021-8-20
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
Oluwatobi Adeyemi 2020-1-29
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

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回答（1 个）

Nikhil Sonavane
Nikhil Sonavane 2020-1-30
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
D = padarray(C,[3 3 3],0,'both');
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.

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