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I've previously done this kind of thing with an ND filter and long exposures to save getting frustrated by occasional passers-by.

Here's a series of photographs of major cities around the world done using this technique by Lucie & Simon:

http://petapixel.com/2012/03/28/post-apocalyptic-photographs... http://www.lucieandsimon.com/works/silent_world

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Wouldn't it be "easy" to capture a video of a minute or so and then write an algorithm to keep the parts that were unchanged among all frames? I did something like that ten years or so ago, and it worked very well (it took the mode of each pixel among X frames).

I know. Why didn't he just write a movement recognition algorithm and run his videos through it. It only has to be one frame really.

In many cases that will do, but there will be problem with continuously changing objects, such as ads, escalators and clocks that will be blurred, at least unless a quite sophisticated algorithm is used.

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