compare dots in two binary images

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Yuvashree Mani Urmila 2014-6-30

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评论： Image Analyst 2014-7-1

I have two binary images(Image1 & Image2). Both images have dots. The images belong to the same scene but taken at different times

I would like to identify the same dots in image 1 and image 2 Missing dots in image 2 New dots in image 2

I am also attaching the images here.

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can someone help. Thanks

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Answer 1

Image Analyst 2014-6-30

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Only 1 image is attached. Why do you want to do this? Whatever you want to do, I think there might be a better way than matching up hundreds of dots. I see a lot of ambiguity. Since they look like single pixels there is a high probability they may either be there or not be there depending on their location over a pixel and their brightness. For example, what if the dot in your scene lands in the corner of 4 pixels on your sensor and now each detects only 1/4 the light from it as when it was perfectly situated over a pixel sensor? It might not be detected at all. If you really do want to match up dots, you can check out the Groth algorithm which is used in Astronomy to match up stars, and has even been used to identify individual whale sharks by their spots. But again, I don't think this is the right approach for whatever you want to do.