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how to subtract a dynamic mask from an image

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Hanif Ullah
Hanif Ullah 2019-7-4
评论： Image Analyst 2019-7-4
how to subtract a dynamic mask from an image. i m using the following code but its only working on static mask.
f=[12 30 120 220 120 130 140 150 120 220 120 120 90 80 70 80]
[r c]=size(f);
m=f(3:5)
f1 =[];
for i=1:r
for j=1:c
sub_result=abs(f(i,j)-m);
f1(i,j)=sum(sub_result(:));
end
end
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Hanif Ullah
Hanif Ullah 2019-7-4
dynamic mean that mask size is changing. like [3 4] is one mask and another mask size is [3 4 5] or may be bigger but less than original matric size.
Image Analyst
Image Analyst 2019-7-4
I think you're going to have to do that manually. There is no built-in function that will scan a mask over a vector when the size and values of the mask change from element to elment as it moves over the vector to be filtered.

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回答（1 个）

KSSV
KSSV 2019-7-4
Are you looking for something like this?
I = [5 8 3 4 6 7 9 3] ;
M = [3 4] ;
M = repmat(M,1,length(I)/length(M)) ;
iwant = I-M
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Hanif Ullah
Hanif Ullah 2019-7-4
actually repmat subtracting block by block. I want that mask subtract shift/move pixel by pixel using loop

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