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clear an area in binary image

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charlie
charlie 2011-8-14
Hi guys,
I need to clear area in a binary image.
I only need the center part of a binary image, for example, only the center 100x100 image out of 1000x1000 image.
I know there is an easy way, prob just 1-2 line of code.
please show me your talent.
good day
C

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采纳的回答

Walter Roberson
Walter Roberson 2011-8-14
W = 100; %window size
img((end-W)/2+1:(end+W)/2, (end-W)/2+1:(end+W)/2) = 0;
Note: this will not work if your window size is even and your image size is odd, or if your window size is odd and your image size is even: in such cases, "center" is not well-defined.
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Walter Roberson
Walter Roberson 2011-8-15
W = 400;
if islogical(img)
t = false(size(img));
else
t = zeros(size(img),class(img));
end
t((x-W)/2+1:(x+W)/2,(y-W)/2+1:(y+W)/2) = img((x-W)/2+1:(x+W)/2,(y-W)/2+1:(y+W)/2));
Note: there are variations of the above that may be a bit clearer or shorter if you can guarantee that the img will not be of type "logical" and will not be of type "int64" or "uint64", or if you can guarantee that the code will only be used in R2011A or later.
charlie
charlie 2011-8-15
thank you for your help. in the mean time, I will get more familiar with Matlab.
Have a good day.
Charlie

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更多回答（1 个）

bym
bym 2011-8-14
img=rand(1000)<.5; % some data
img(451:550,451:550); % center 100x100
  2 个评论
charlie
charlie 2011-8-14
thanks, i want to know how to set everything apart the cetner 100x100 to zero. not the center 100x100.
how about with a random shift.
charlie
charlie 2011-8-14
a random shift of (x,y)

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