change in a image

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Shilpi Gupta
Shilpi Gupta 2019-7-8
回答： Bjorn Gustavsson 2019-7-8
hello
I want to find the change in a same image after some interval of time.How can i do this in matlab?
Please suggest me the ideas.
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KALYAN ACHARJYA
KALYAN ACHARJYA 2019-7-8
@Shilpi Which properties? Properties represents broad sense, please name the terms
Walter Roberson
Walter Roberson 2019-7-8
The only real properties that images have, for MATLAB purposes, are:
  1. size
  2. datatype
  3. RGB versus pseudocolor
  4. mapping of data ranges to color (caxis)
  5. callbacks

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Bjorn Gustavsson
Bjorn Gustavsson 2019-7-8
The only meaningful interpretation I can come up with is that you have two images of the same scene taken from a static camera ("the same image" if only stored on disc will be constant over time or corrupted...). For that I'll assume that you have constant illumination of your scene. Then do something like this:
Im1 = imread('img1.png'); % or whatever filename
Im2 = imread('img2.png'); % or whatever filename
Im1 = double(Im1);
Im2 = double(Im2);
dImg = Im2 -Im1;
dImg = (dImg-min(dImg(:)))/(max(dImg(:))-min(dImg(:)));% Should map difference to between 0-1
imagesc(dImg)
HTH

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