This is how finish line cameras at races normally work. At least many of the bike races I've been in.
Yes, all professional track meets (e.g. the Olympics) use these cameras to officially determine order of finish.
A Very Unusual Camera That Emphasizes Time Over Space
41–50 of 61 posts
Re: A Very Unusual Camera That Emphasizes Time Over Space
#42Looking at those photos, I wonder if a "time algorithm" could reconstruct them into a "normal" photo?
You would need multiple slits to be recorded at the same time, but that would just be separating a still frame from a video stream.
Re: A Very Unusual Camera That Emphasizes Time Over Space
#43I did something similar once with a flatbed scanner. Put my hand/face/whatever on the bed and moved it parallel to the scan head. Made for really long creepy fingers or a smushed up face.
Re: A Very Unusual Camera That Emphasizes Time Over Space
#44It seems like it would be simple enough to convert a video into an image like these by isolating a single column of pixels from each frame and putting them together chronologically.
Yeah, that was fun: #starting at 467s and outputting the images of the next 3 seconds ffmpeg -ss 467 -t 3 -i video.mkv output.%04d.png # crop image to 1px slices 280 pixels from the left. gm mogrify -crop 1x+280+0 *.png # stitch them gm montage -border 0 -geometry +0+0 -tile x1 *.png image.jpg Perfect example how easy and straightforward it is to use command line utilities. Now someone just has to find movies with st…
Cool demo. The 'gm montage' step isn't working for me and I'm finding its options completely non-intuitive. I produced a series of 1979 PNGs from a 66-second video, and when I stitch them with:
gm montage -borderwidth 0 -geometry +0+0 -tile x1 *.png image.jpg
# of 1-px wide PNGs Resulting width (px)
5 3
10 4
20 5
50 8
100 10
200 15
500 23
1000 32
1979 45
What's up with the crazy widths on the result? What is GraphicsMagick doing?
Re: A Very Unusual Camera That Emphasizes Time Over Space
#45Slit scan photography has been used artistically before: http://www.cabinetmagazine.org/issues/25/belden-adams.php (the picture of the runner and the cyclist is nicely mindbending) And pretty much everyone here would be familiar with a couple of artistic uses of slit-scan photography - the opening credits of Doctor Who ( http://h2g2.com/approved_entry/A907544 ) and the ending of 2001: A Space Odyssey.
Look at the photo from the article you linked... http://www.cabinetmagazine.org/issues/25/direction%20of%20ti...
The caption says... "the biker and runner crossed the finish line moving in opposite directions"
Wow!
Re: A Very Unusual Camera That Emphasizes Time Over Space
#46Slit scan photography has been used artistically before: http://www.cabinetmagazine.org/issues/25/belden-adams.php (the picture of the runner and the cyclist is nicely mindbending) And pretty much everyone here would be familiar with a couple of artistic uses of slit-scan photography - the opening credits of Doctor Who ( http://h2g2.com/approved_entry/A907544 ) and the ending of 2001: A Space Odyssey.
Look at the photo from the article you linked... http://www.cabinetmagazine.org/issues/25/direction%20of%20ti... The caption says... "the biker and runner crossed the finish line moving in opposite directions" Wow!
They crossed the finish line in the same direction: past to future.
Re: A Very Unusual Camera That Emphasizes Time Over Space
#47Looking at those photos, I wonder if a "time algorithm" could reconstruct them into a "normal" photo?
Probably not, as the slit is kept looking at one plane. You could turn it into a video one pixel wide, though.
It might be interesting to see a video where each frame is one photo of this, and over time it goes through the different X-positions. Effectively swapping the horizontal and time axis in a video.
Re: A Very Unusual Camera That Emphasizes Time Over Space
#48Earlier quoted context omitted.
Look at the photo from the article you linked... http://www.cabinetmagazine.org/issues/25/direction%20of%20ti... The caption says... "the biker and runner crossed the finish line moving in opposite directions" Wow!
They crossed the finish line in the same direction: past to future.
Face first is what matters here.
Re: A Very Unusual Camera That Emphasizes Time Over Space
#49Re: A Very Unusual Camera That Emphasizes Time Over Space
#50Looking at those photos, I wonder if a "time algorithm" could reconstruct them into a "normal" photo?
You would need multiple slits to be recorded at the same time, but that would just be separating a still frame from a video stream.
If you start with a video you can do this. You'd transform an X x Y x T dataset (X x Y dimensional frames shown over a period 0-T) into a T x Y x X dataset (T x Y dimensional frames shown over a period 0-X).
For a long video you'd get a very wide image that varies over a pretty short duration. A 1920x1080 video clip that's 80 seconds long @24 fps would come out right. It'll still be 1920x1080 and 80 seconds long after transformation.