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subtraction of two images

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vidya
vidya 2013-10-18
评论： snehal dahiphale 2017-2-8
I have two images with different dimension. I need to perform subtraction on it. I am not able to do it and don't know how to fix the error. Can somebody tell me the right code in matlab? i am unable to post images here. each time i do it i get error saying matrix dimension must agree. how shall i solve it
R=imread('If.jpg');
S=imread('j.jpg');
f8=R-S;
below is the description of my image u= imread('If.jpg');
whos Name Size Bytes Class Attributes
u 363x484x3 527076 uint8
v= imread ('j.jpg');
whos Name Size Bytes Class Attributes
v 900x1200x3 3240000 uint8
i am unable to subtract it because of the error minus Integers can only be combined with integers of the same class, or scalar doubles.
Error in ==> file1>filter_Callback at 695 f8=If-J;

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David Sanchez
David Sanchez 2013-10-18
You can not subtract images with different sizes the same way you can not subtract arrays with different lengths:
a=[1 2 3 4];
b=[1 2];
c=a-b; % -> !!!!! this will yield an error, dimensions must agree. Same for your images
Perform a crop of the biggest image with the dimensions of the smallest, use imcrop:
doc imcrop
and then subtract the smallest image and the crop from the biggest.
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vidya
vidya 2013-10-19
thank you for replyin sir...but when i perform crop of the big image i am getting error msg ssayin > minus Number of array dimensions must match for binary array op.
Error in ==> file1>filter_Callback at 703 f8=J-If; how shall i correct it

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