How to replace a value in a matrix of pixels using matlab ?

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dhaarani chandrasekaran
评论： dhaarani chandrasekaran 2017-2-14
I have a 225*225 image.I don't know how to replace a pixel value using indices value.please reply as soon as possible.
Thanks in advance.
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dhaarani chandrasekaran
dhaarani chandrasekaran 2017-2-14
I have tried this code.But I am trying to replace values in a matrix based on some conditions without loop. please reply as soon as possible.

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回答（1 个）

mizuki
mizuki 2017-2-14
If you want to replace the pixel (i,j)=(100,125) of the variable img with 0.2, use the following code:
i = 100;
j = 125;
img(i,j) = 0.2;

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