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Thread started 08 Apr 2010 (Thursday) 08:35
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?????rolling shutter effect on golf swing????

 
mayerk
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Apr 08, 2010 08:35 |  #1

I decided to make a video of my golf swing for training purposes with my flip camera. As I was going frame by frame I noticed the shaft flex is very strange. This was a concern to me as these are brand new clubs that I was fitted for and pretty expensive. Before I go to Golf Galaxy and raise hell, I just want to make sure that what I'm looking at is not simply a classic case of the rolling shutter effect.
It almost seems like it is but I the only distortion is in the center of the shaft. I would think rolling shutter would cause more distortion in other areas as well....i.e. arms/hands & the club head where the speed is highest.

Anyway, here's an example......

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snyderman
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Apr 08, 2010 09:48 |  #2

I'm no expert on shooting golf swing video or analyzing the results, but something doesn't look quite right with the club in your examples.

Yes, a club should 'flex' and 'kick' through the hitting zone, but certainly not like that! It appears to be some sort of visual distortion going on.

What clubs and shaft with your new irons?

dave


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bobt0248
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Apr 08, 2010 09:56 |  #3

Interesting effect!. I would think that the club should flex in the other direction if this is on the downswing. Something does not look right. Now I am going to have to go hit some balls and video taped myself and roll it back in slow mo.

Bob




  
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mayerk
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Apr 08, 2010 09:56 |  #4

They're Mizuno MX300's with stiff flex steel shafs. I know some flexing is normal but it almost seems physically impossible for the flex to be in that direction at that point in the swing. If anything, I would expect it to be flexed the other way.
I posted the video on a golf forum and someone suggested it might be rolling shutter effect. I did a little research and it seems this is most likely the cause but from the examples I've seen I cant say for sure. From what I've seen of the rolling shutter it produces diagonal lines instead of vertical where motion is present. My pictures have a curved effect, but I suppose it's not out of the question for the shaft to flex like that.........


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aroundlsu
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Apr 08, 2010 11:34 |  #5

You should try shooting at the "proper" 180 degree shutter speed. At 24p that would be 1/50th.


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Apr 08, 2010 12:16 as a reply to  @ aroundlsu's post |  #6

Typical rolling shutter would exhibit the exact opposite distortion - CMOS scanning from top down, making the top of the frame update before the bottom, so the club would look bent in the other direction.

What kind of camera is this? This might make sense if its sensor scans bottom-up or right-left. ? very weird


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mayerk
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Apr 08, 2010 13:27 |  #7

bpaulette wrote in post #9957151 (external link)
Typical rolling shutter would exhibit the exact opposite distortion - CMOS scanning from top down, making the top of the frame update before the bottom, so the club would look bent in the other direction.

What kind of camera is this? This might make sense if its sensor scans bottom-up or right-left. ? very weird

I used a flip video camera. I know its not a DSLR video, or Canon for that matter, but I figured someone here would be able to tell if it's some kind of distortion caused by the camera. Again, I also cannot rule out the shaft flex itself but it seems highly unlikely. Thanks to all that have replied so far.


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TheBurningCrown
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Apr 08, 2010 13:38 |  #8

mayerk wrote in post #9957596 (external link)
I used a flip video camera. I know its not a DSLR video, or Canon for that matter, but I figured someone here would be able to tell if it's some kind of distortion caused by the camera. Again, I also cannot rule out the shaft flex itself but it seems highly unlikely. Thanks to all that have replied so far.

Easy answer: Go back to the course, set up your camera on a tripod with a high shutter speed. Wireless remote or self timer. Nothing will put your mind at ease like irrefutable proof that such flex isn't actually there and is actually a product of the camera.


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mayerk
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Apr 08, 2010 13:47 |  #9

TheBurningCrown wrote in post #9957664 (external link)
Easy answer: Go back to the course, set up your camera on a tripod with a high shutter speed. Wireless remote or self timer. Nothing will put your mind at ease like irrefutable proof that such flex isn't actually there and is actually a product of the camera.

easier said then done. I may have to hit a thousand balls before I get a similar swing position using a timer. wireless remote would be even harder with both hands on a golf club.


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mayerk
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Apr 08, 2010 13:52 |  #10

here's a link to the video if it helps at all.....
http://s35.photobucket​.com …urrent=golf2.fl​v&newest=1 (external link)


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TheBurningCrown
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Apr 08, 2010 17:58 |  #11

mayerk wrote in post #9957726 (external link)
easier said then done. I may have to hit a thousand balls before I get a similar swing position using a timer. wireless remote would be even harder with both hands on a golf club.

1.) Use a footswitch.
2.) Borrow a friend!
3.) High FPS mode!

There are more but I shall not continue ;)


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hqqns
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Apr 08, 2010 18:09 as a reply to  @ TheBurningCrown's post |  #12

This effect is entirely due to the camera. It must be reading the bottom of the image first and scaning up.

The only way you can fix the way you want the shaft to look is by filming the action with the camera upside down and then post processing flipping the video the right way up again.

Offcourse the shaft will look a LOT more bent that what it actually is in reality.


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LSV
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Apr 08, 2010 18:37 |  #13

hqqns wrote in post #9959290 (external link)
This effect is entirely due to the camera. It must be reading the bottom of the image first and scaning up.

The only way you can fix the way you want the shaft to look is by filming the action with the camera upside down and then post processing flipping the video the right way up again.

Offcourse the shaft will look a LOT more bent that what it actually is in reality.

Unless you swing backwards, you are backwards there. Signal wise, it is indeed going from top to bottom, with the swing being fast enough that we have a 30 degree offset. If we knew the framerate and "shutter" speed, you could probably calculate the angular velocity as a function of rolling shutter rate :D




  
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hqqns
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Apr 08, 2010 18:55 |  #14

LSV wrote in post #9959433 (external link)
Unless you swing backwards, you are backwards there. Signal wise, it is indeed going from top to bottom, with the swing being fast enough that we have a 30 degree offset. If we knew the framerate and "shutter" speed, you could probably calculate the angular velocity as a function of rolling shutter rate :D

Had another look at the images and offcourse you are right. I stand corrected :)

You could do that but it's probably done more easily and accurately if you use two frames and just look at how far the head of the club has moved in a certain amount of frames apart :)


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?????rolling shutter effect on golf swing????
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