shifting an image vertically down.

Question

Odom Seng 2016-6-28

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https://ww2.mathworks.cn/matlabcentral/answers/292803-shifting-an-image-vertically-down

回答： Image Analyst 2016-6-29

Hi, I want to shift a picture vertically down by 50 pixels here is my code:

X=imread('photo1.jpg');
X_double=double(X);
[m,n]=size(X_double);
E=eye(n);
T=zeros(n,n);
r=50;
T(1:r,:)=E(n-(r-1):n,:);
T(r+1:n,:)=E(1:n-r,:);
X_shift=T*X_double

I'm trying to make a transformation matrix and then multiply the resulting matrix by the image matrix "X". I keep getting an error though:

"Error using , inputs must be 2-D, or at least one input must be scalar. To compute elementwise TIMES, use TIMES (.) instead."

Any help is much appreciated, thanks.

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Adam 2016-6-28

What are you wanting to happen to the bottom 50 pixels and what is supposed to fill the 50 left at the top? I don't see why you are trying to do a multiplicative transform just to shift an image.

Can't you just concatenate the image vertically with 50 rows of zeros?

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