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Dual Photography

mm648230 · demo · Watch on YouTube

Computer graphics & renderingComputer vision, speech & NLP

What it is

The SIGGRAPH 2005 demo of dual photography from Stanford, which swaps the roles of projector and camera to render a scene from the light's point of view. It includes the reveal of a hidden playing card.

Why Hacker News recommends it

Cited whenever threads discuss recovering hidden images or non-line-of-sight imaging, as a clear demonstration of light transport.

  • 4 people recommended it
  • 4 different months
  • 1 strong recommendations
  • first 2013, last 2026

What HN commenters said

  1. “Skip ahead to 4:19 for a succinct demo.”

    Succinct SIGGRAPH 2005 dual photography demo.

    uptown, 2014-05 · Strong recommendation · in “How taking pictures through windows can inadvertently reveal your location”

  2. “The video [2] gives a good explanation”

    Good explanation including the hidden playing card reveal.

    evanb, 2013-12 · Recommendation · in “Reflected hidden faces in photographs revealed in pupil”

  3. “I recommend watchign the video from the paper for good explains and demonstrates the technique.”

    Clear demonstration of swapping lights and cameras in a scene.

    pdkl95, 2020-02 · Recommendation · in “TV Backlight Compensation”

  4. “A very cool demonstration of how light conveys information is in dual photography”

    Demonstrates how light carries information, rendering from the light's view.

    saeranv, 2020-06 · Recommendation · in “In a photo of a black hole, a possible key to mysteries”

Excerpts from Hacker News comments, linked to the originals. Summaries and labels were written by a language model from those comments.

Topics: dual photography, light transport, siggraph, projector camera, imaging

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