How do I differentiate between various shapes when doing image recognition?

I am working on a project called "Comets Recognition From Satellite Images".

I tried to eliminate noise using subtraction and blur by Gaussian. I have found objects in the image. The image may consist of noise such as cosmic rays, blobs etc. How could I differentiate between noise like cosmic rays from actual comets?

Any ideas would be helpful.

[Sean de Wolski]

Post your images here so we can see them.

Answer 1

[Walter Roberson]

Capturing a cosmic ray should be an uncommon event -- and it should be completely gone in the next image. Remember, comet tracking requires looking for objects that exist in sequential images but have moved.