Translation of a matrix

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Angela Ebirim
Angela Ebirim 2019-10-22
回答： Sai Bhargav Avula 2019-10-31
Hi,
I'm trying to understand translation of an image (from one spatial point to another) and wrote some code in order to do so however the image isn't translating/moving.
I read that a translation matrix would typically be [1 0 tx; 0 1 ty; 0 0 1] where (tx, ty) would be the new spatial co-ordinates that the image would move to,and you would multiply the translation matrix by the C = imread(image), however how would that work if the size of the image was for example 684 X 1024 ?
I tried to do it this way instead.
Can someone please tell me where I'm going wrong ?
PS: I don't want to use imtranslate MATLAB function.
Many thanks
grid on
axis([-1 1 -1 1])
S = [1 -1 -1 1; 1 1 -1 -1; 1 1 1 1]
x=S(1,:); y=S(2,:);
patch(x,y,'r')
%translation matrix
T = [5;4];
%new spatial co-ordinates
new_x = size(S,1) + T(1,1);
new_y = size(S,2) + T(2,1);
% creation of zero padding matrix in order to perform matrix operations
Z = zeros(new_x,new_y);
M = Z(T(1,1):end-1, T(2,1):end-1) + S(:,:);
figure; patch(M(1,:),M(2,:),'r')

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回答（1 个）

Sai Bhargav Avula
Sai Bhargav Avula 2019-10-31
Hi,
Here is a simple translation code
T = [5,5];
% here S is a image hence 3rd dimension
tran_S = uint8( zeros(size(S,1)+T(2)-1, size(S,2)+T(1)-1, size(S,3));
% Translate
tran_S(T(2):end, T(1):end, :) = S;
imshow(tran_S)
Hope this helps!

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