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Removing background from an AVI using ImageJ

I've recently been taking a lot videos of swimming cells, with the aim of calculating their velocity. In each video there is inevitably some background dirt or stuck cells, which can hinder the macro I use to automatically track cells. To deal with this problem I've written a very simple ImageJ macro (ImageJ is an excellent, free, open source image processing program) to remove static objects from an AVI or stack of images, which has proved surprisingly effective.