Rolling Shutter Effect?

[steevg]

Hi all.

I just recently tried a VIO POV HD system - a wonderful system generally, however, whenever there was any amount of vibration present, wavy lines would appear across the screen. Trying to watch this afterwards is definitely not a pleasant experience.

Very similar to this: http://www.youtube.com/watch?v=UEaDrS-yzIE

Having done a bit of research via Google, I'm finding that this is commonplace amongst CMOS HD camera's - this effect is also referred to as "Wobble Vision".

I'd be interested to hear how the new ChaseCam HD Camera head performs with respect to vibration.

Regards.

[Terry Kennedy]

Very similar to this: http://www.youtube.com/watch?v=UEaDrS-yzIE

Having done a bit of research via Google, I'm finding that this is commonplace amongst CMOS HD camera's - this effect is also referred to as "Wobble Vision".
It looks to me like the right-hand (CMOS) camera was on a mount made out of Jello or something - you can see this clearly at around 1:10, when the bike is at a red light and he revs the engine.

The only camera artifact I've noticed on the PDR-100 / Chase bullet cam combo is a strobe or fade effect on LEDs (traffic lights, tail lights). That's the same thing as the "wheels turn backwards" you see on TV / movies.

I'd be interested to hear how the new ChaseCam HD Camera head performs with respect to vibration.
I'd like to see a good piece of raw video from a DIVA HD as well - the only ones I've seen have been the two posted here, with data overlay, and frankly, I'm utterly underwhelmed. Perhaps that's from the YouTube re-encoding (even at 720p). Maybe the windscreen was dirty. Maybe there was vaseline on the camera lens. :confused:

[steevg]

Terry,

Actually it's very similar to the footage I got!

I tried several mounting options from a simple cable tie lashed around a post, to a suction mount (RAM mount type), then a screwed on, CNC'd rock solid mount.

I'd agree that the softer the mount, the less the distortion.
There's a good explanation about what causes it here:

http://www.thefoundry.co.uk/products/rollingshutter/

But most of us (I suspect) don't want to go through all this post production hassle to fix the issue (as explained in the video). I'd expect time will rectify the problem, but many of my customers are asking for HD now, and find it difficult to believe that it's not as robust and good as SD at the moment.

Footage I get from the Chasecam is good, always has been . . . . this issue purely relates to new HD camera's - not recorders's.

Regards.

[Terry Kennedy]

I tried several mounting options from a simple cable tie lashed around a post, to a suction mount (RAM mount type), then a screwed on, CNC'd rock solid mount.
Take a look at these PDR videos. They are the raw files that came out of the PDR, at the "Highest" quality setting.

Rollbar (http://www.tmk.com/transient/R85N0387.MPG)
Nose (http://www.tmk.com/transient/N85N0386.MPG)

Both cameras are hard-mounted - the rollbar one is on the Chase tilt/swivel head, bolted directly to the rollbar, and the nose one is in a hose-clamp type mount on the front tow eye (which you can see in the other current thread). And an Atom is not a soft ride.

I'm less concerned about judder than I am about the weird interlacing artifacts and color ringing. :(

Footage I get from the Chasecam is good, always has been . . . . this issue purely relates to new HD camera's - not recorders's.
I've always been looking for a better picture than I get from the PDR-100 / Chase bullet cameras, since the very first video I got. Initially, I thought I had a setting wrong or a hardware problem on both units.

Once I get back from picking up my car later this summer, I'm going to look at HD solutions, including the DIVA. But this time I'm definitely going to "try before I buy".