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I have some images which have some objects of my interest. The objects have very low contrast w.r.t. background and I would like to detect the edges of these objects in these low-contrast images. Any suggestions?

An example image is shown below (objects are the rectangles in the right side of the image and the edges are their boundaries).

Thanks.

enter image description here

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Why don't you initially apply basic gray scale modificiations such as gamma , contrast etc.

Here is the result of performing such a simple processing:

enter image description here enter image description here

It's now a more recognizable image at least for a human viewer and I believe the software algorithm will also perform better, provided it was not already doing it...

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