change in a image

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.

[KALYAN ACHARJYA]

Please define what does change mean here? Any parameters.

It would be helpful to answer, if yo elaborate more.

To change on image you can do the number of ways-

1. Add Noise
2. Airthmetic Operations
3. Transform
4. Pixel value modification......

.........

[Shilpi Gupta]

Thank you for your reply sir.

change means the change in the properties of an image.

I want to see the difference in the same image after some number of days.

[KALYAN ACHARJYA]

@Shilpi Which properties? Properties represents broad sense, please name the terms

[Walter Roberson]

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

Answer 1

[Bjorn Gustavsson]

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