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

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Oluwatobi Adeyemi 2020-1-23

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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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Nikhil Sonavane 2020-1-29

Can you explain your query is a well defined way?

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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Answer 1

Nikhil Sonavane 2020-1-30

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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.