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I have multiple images of (let's say) a busy street. All taken with the exact same angle, and the people are moving around.

It stands to reason that if I could compare all images and get only "the part that is common to all images", I would have an image of an empty street.

Any thoughts on how this could be achieved?

  • In Photoshop, use "Stack Mode" - see here: photo.stackexchange.com/questions/20953/… – MikeW Jan 10 '15 at 1:49
  • There are a myriad of demonstrations of this on youtube. Photoshop supports this effort through loading a stack, of images and automatically aligning them. – JDługosz Jan 10 '15 at 8:05
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you have two choices

the first method use software (photoshop)

  1. shoot from the same angle using your tripod (preferable) - time laps shoots. or
  2. shoot when you can see the street is clearer as much as possible some shoots.
  3. now combine all your shoots in photoshop using Auto-align and median tool.

for more information please see that video https://www.youtube.com/watch?v=-Ck62S7lrPA

The second method is to use your camera with a long exposure using your tripod and a suitable ND filter depending on how long you expose and the light intensity of your scene. some do it using a square glass holder with a dark glass.

for more please see that video https://www.youtube.com/watch?v=T24_uq0AY6o

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You can use StarStaX to average the pictures if you want. It has a lot simpler interface than Photoshop (and is free!) for that kind of task.

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