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8/52: Video space-time transposition

I’m interested in odd camera designs, such as slit photo finish cameras (historically used for race finishes lines when it’s a close call). It occurred to me that I could easily make slit photo finish images by taking a video (using my Leica D-LUX digital camera) and then writing a script to process the video (by taking a vertical line of pixels from each frame of the video, and stacking them end-to-end to make a single still image).

Then it occurred to me I could go one further - because I have a choice of which vertical line of pixels to use on the video, I could use every possible vertical line of pixels to make lots of photos finish images, and put them back into a video.

Then I realised another way of thinking about what I was doing: in effect, I was rotating (or transposing) the original video’s array of pixels (for a video is actually nought but a 3D array of pixels), swapping one space dimension and the time dimension.

So I made some videos as described. The following two pictures show a frame from an input video, and one from the corresponding output video:

Input video

Input video

Output video

Output video

To see the actual input and output videos, please visit the flickr video set.

For some actual analysis and thoughts on what is happening, and what sort of effects happen in the output videos, please visit this page on the Cookbook wiki.

(Coming soon: link to the python script for generating these videos.)

4 Responses to “8/52: Video space-time transposition


  • Bruce
    August 9th, 2008 20:10
    1

    I always wanted to do something like that since I saw the image of Douglas Adams on the back of the Hitch Hikers Radio Scripts. I didn’t have the technology at the time, and by the time I did I had lots of other distractions!

  • Bruce
    August 9th, 2008 20:11
    2

    I forgot to say: nice work!

  • Nunpuncher
    November 3rd, 2008 20:15
    3

    These are well cool! Have you fully mastered this yet? Can you plan in advance how you want it to look and then shoot the video to give the desired effect?

    J

  • Nunpuncher
    November 3rd, 2008 20:15
    4

    Cool site by the way.

    J

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