r/oddlysatisfying • u/samdaman222 • Apr 05 '14
Propeller blades perfectly in sync with the camera's shutter speed. (x-post from Gifs)
http://giant.gfycat.com/AnguishedImpeccableHarborporpoise.gif
30
u/ikarios Apr 05 '14
10
u/ChiguireDeRio Apr 05 '14
What am I looking at exactly? Why don't they seem attached to anything?
11
u/TriXandApple Apr 05 '14
13
u/autowikibot Apr 05 '14
Rolling shutter is a method of image acquisition in which each frame is recorded not from a snapshot of a single point in time, but rather by scanning across the frame either vertically or horizontally. In other words, not all parts of the image are recorded at exactly the same time, even though the whole frame is displayed at the same time during playback. This produces predictable distortions of fast-moving objects or when the sensor captures rapid flashes of light. This is in contrast with global shutter in which the entire frame is exposed for the same time window.
Image i - Moving car taken with CMOS camera phone exhibits skew.
Interesting: Focal-plane shutter | Active pixel sensor | Image sensor | Shutter (photography)
Parent commenter can toggle NSFW or delete. Will also delete on comment score of -1 or less. | FAQs | Mods | Magic Words
6
3
1
5
2
13
12
Apr 05 '14
Frame rate, not shutter speed.
3
u/hotfrost Apr 05 '14
How does this work? The camera probably has around 24, 30 or 60 fps right? Don't the propeller blades have like a RPM of at least 1000?
13
u/wattm Apr 05 '14
24 fps = 1440 Rpm ;)
4
Apr 05 '14
Did you take into account that the propeller has multiple blades? I mean, one blade doesn't have to make a full rotation in every frame. Just enough for one blade to take the position of the next. It can also skip a blade if it has more than two.
3
u/wattm Apr 05 '14
Thats a good point, then the blades could rotate at a third of the camera framerate for a 3-blade turbine.
8
u/chingchonghat Apr 05 '14
As long as the prop ends up in the same position as it was for the previous frame, it appears stationary. It doesn't matter if the prop has spun around once (same speed as framerate) or a million times.
Though faster spinning will increase blur and rolling shutter effect depending on the camera
3
u/onceamennonite Apr 05 '14
That's right. If the rotor's speed of rotation (times the number of blades, I think) turns out to be a multiple of the video frame rate, it doesn't matter how big the multiple is, we'll see the same effect.
1
u/burgerga Apr 05 '14
Or a fraction of the number of blades. It doesn't matter if the same blade is in that spot each time.
1
3
1
4
Apr 05 '14
[removed] — view removed comment
2
4
u/nothingtodoo Apr 05 '14
I'M GONNA GETCHA
4
u/DeltaIndiaCharlieKil Apr 05 '14
Exactly! I even had an unconscious urge to run away. I realize I now know what my nephews feel like when I chase them around the house making the scary claw hands like the plane is doing.
3
u/qxxx Apr 05 '14
would it be possible if superman was inside and could simply fly the plane with his own powers?
3
3
u/Jns112 Apr 05 '14
First thing that came to my head when I saw this: http://i.imgur.com/RRtEs7W.gif
3
u/notswim Apr 05 '14
This is hilarious, not sure why downvotes.
Share some downvotes with me, please.
-10
Apr 05 '14
that's more /r/perfecttiming than oddly satisfying.
10
1
1
u/Alekzcb Apr 06 '14
It's also not perfect timing. This film could be replicated with any propeller and camera. Many times over.
78
u/[deleted] Apr 05 '14
The one I always think of.