Whats causes weird lines and artifacts with EX1 at DVinfo.net

Whats causes weird lines and artifacts with EX1 · November 11th, 2009, 09:53 PM

I was bored today, so I decided to go outside and shoot some video of my 1995 3000GT SL.
The day had a thin overcast and the sun was in the west casting a golden light accross the sky.

My 1995 3000GT SL shot with SONY PMW EX1 on Vimeo

If one looks close at the video they will see weird artifact type throughout the video.
Like when I am slowly zooming into the chrome wheel, there is a weird movement in the top center of the wheel.

Whats cause these lines and issues??

Adam Stanislav · November 11th, 2009, 10:17 PM

It looks like aliasing, which happens when the analog world is digitized. With high def you normally do not notice it. But when you are zooming in on that shiny surface, the eye may start noticing the gradual changes in the aliasing from one frame to another. What was your shutter speed?

Eddie Coates · November 11th, 2009, 10:59 PM

I am learning how to use my SONY EX1 lol :)

Shutter speed was /60

Adam Stanislav · November 11th, 2009, 11:53 PM

Aliasing has been with motion pictures pretty much from the start. Even if film was analog in capturing the image, it has always been digital in the temporal dimension (i.e., breaking the motion into individual frames). The most notable example of early aliasing was the wheels stopping or moving backwards during a chase.

There is not much you can do about it. You might shoot at a higher resolution, such as 4K and then downsample it to 1080p, at least that is how anti-aliasing is done in computer generated images. Of course, you cannot do that with the EX1 or the EX3.

You may try shooting from a different angle and see if that helps. You may try a slower shutter speed so it all gets fuzzier. Or you may just not worry about it as your typical audience is going to be so wrapped up in the story they will not notice such details. And you will give some nerd the satisfaction of writing about it in the mistakes section of your imdb listing. :)

Alexander Kubalsky · November 12th, 2009, 06:56 AM

I wonder if adjusting the crispening setting or detail setting would help reduce this aliasing.
What were your detail and crispening settings?

Brooks Graham · November 12th, 2009, 09:52 AM

Hmmm. Does this problem appear in the source material straight from the camera? Or is it only present after re-sizing?

November 11th, 2009, 10:59 PM	#3
Eddie Coates Regular Crew Join Date: Jun 2008 Location: Scottsdale, AZ Posts: 53	I am learning how to use my SONY EX1 lol :) Shutter speed was /60 __________________ SONY EX1, (Vista Ultimate 64bit, i-7 core processor, 12gigs of DDR3, ATI 5870 GPU Adobe CS4) Canon 5DMkII and Canon 7D 70-200mm 2.8L IS, Tamron 28-75mm 2.8 XR Di

November 12th, 2009, 06:56 AM	#5
Alexander Kubalsky Regular Crew Join Date: Jan 2008 Location: Japan Posts: 171	Could it be.. I wonder if adjusting the crispening setting or detail setting would help reduce this aliasing. What were your detail and crispening settings?

November 12th, 2009, 09:52 AM	#6
Brooks Graham Regular Crew Join Date: Nov 2008 Location: San Francisco, CA Posts: 112	Hmmm. Does this problem appear in the source material straight from the camera? Or is it only present after re-sizing? __________________ EX3, Z1U, FX1, D1X / NeXTstation Turbo Color / FCS3

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November 11th, 2009, 10:17 PM	#2
Adam Stanislav Major Player Join Date: Oct 2009 Location: Rhinelander, WI Posts: 297	It looks like aliasing, which happens when the analog world is digitized. With high def you normally do not notice it. But when you are zooming in on that shiny surface, the eye may start noticing the gradual changes in the aliasing from one frame to another. What was your shutter speed?

November 11th, 2009, 11:53 PM	#4
Adam Stanislav Major Player Join Date: Oct 2009 Location: Rhinelander, WI Posts: 297	Aliasing has been with motion pictures pretty much from the start. Even if film was analog in capturing the image, it has always been digital in the temporal dimension (i.e., breaking the motion into individual frames). The most notable example of early aliasing was the wheels stopping or moving backwards during a chase. There is not much you can do about it. You might shoot at a higher resolution, such as 4K and then downsample it to 1080p, at least that is how anti-aliasing is done in computer generated images. Of course, you cannot do that with the EX1 or the EX3. You may try shooting from a different angle and see if that helps. You may try a slower shutter speed so it all gets fuzzier. Or you may just not worry about it as your typical audience is going to be so wrapped up in the story they will not notice such details. And you will give some nerd the satisfaction of writing about it in the mistakes section of your imdb listing. :)