How can I counter the distortion of a fisheye? at DVinfo.net

Matt Blair · January 21st, 2004, 02:21 PM

That's a long subject. . . . .

I make video tours of houses, and I have the .3x century optics 37mm lens. . .with a Sony TRV11. I wanted the lens so that I can get a much wider view of the house (since I'm working on confined spaces), but it seems the distortion is way too much!!

Are there any filters for Adobe Premiere that could pull the corners outward to counter the distortion?

Kind of like this. . . . .

A still, with the corners represented with numbers. . . .

1-2-3
4-5-6
7-8-9

And, change that frame to (and cropping back to original size)

1---2---3
--4-5-6--
7---8---9

(the hyphens are just so that I can position the numbers right, pretend they aren't even there)

In effect. . .pulling the top right/left corners and bottom right/left corners outward to counter the distortion caused by a fisheye.

Robert Knecht Schmidt · January 21st, 2004, 02:28 PM

You're talking about barrel distortion. Google brings up this link. Also, The Imaging Factory makes a Debarrelizer plugin. Note that it's best not to zoom when acquiring footage that will be treated in post.

Mark Jefferson · January 21st, 2004, 02:44 PM

Also, AfterEffects has a filter that corrects fish-eye distortion

Cheers,
Mark Jefferson

Adrian Douglas · January 21st, 2004, 10:33 PM

Filters that correct distortion do so quite well but you lose quite a bit of the field of view. You'd probably be better off selling the fisheye and getting a decent .6 wide angle adapter

Bill Pryor · January 22nd, 2004, 09:43 AM

One reason for using a fisheye is to get the distortion. As the above post suggested, dump the fisheye and go with a wide angle, although when you tilt it up or down you probably will get some distortion near the edges.

Mark Jefferson · January 22nd, 2004, 02:05 PM

Actually, the AE filter warps the image so it is (relatively) straight. You don't lose any field of view.

January 21st, 2004, 02:21 PM	#1
Matt Blair New Boot Join Date: Nov 2003 Location: I N D I A N A Posts: 10	How can I counter the distortion of a fisheye? That's a long subject. . . . . I make video tours of houses, and I have the .3x century optics 37mm lens. . .with a Sony TRV11. I wanted the lens so that I can get a much wider view of the house (since I'm working on confined spaces), but it seems the distortion is way too much!! Are there any filters for Adobe Premiere that could pull the corners outward to counter the distortion? Kind of like this. . . . . A still, with the corners represented with numbers. . . . 1-2-3 4-5-6 7-8-9 And, change that frame to (and cropping back to original size) 1---2---3 --4-5-6-- 7---8---9 (the hyphens are just so that I can position the numbers right, pretend they aren't even there) In effect. . .pulling the top right/left corners and bottom right/left corners outward to counter the distortion caused by a fisheye. __________________ matt blair matt blair matt blair matt blair matt blair matt balir

January 21st, 2004, 02:28 PM	#2
Robert Knecht Schmidt Wrangler Join Date: Feb 2002 Location: Cleveland, Ohio Posts: 1,933	You're talking about barrel distortion. Google brings up this link. Also, The Imaging Factory makes a Debarrelizer plugin. Note that it's best not to zoom when acquiring footage that will be treated in post. __________________ All the best, Robert K S Search DVinfo.net for quick answers \| The best in the business: DVinfo.net sponsors

January 21st, 2004, 10:33 PM	#4
Adrian Douglas Trustee Join Date: Oct 2001 Location: Chigasaki, Japan. Posts: 1,660	Filters that correct distortion do so quite well but you lose quite a bit of the field of view. You'd probably be better off selling the fisheye and getting a decent .6 wide angle adapter __________________ Adrian DVInfo.net Search for quick answers Where to buy? From the best in the business...DVInfo.net sponsors

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January 21st, 2004, 02:44 PM	#3
Mark Jefferson Regular Crew Join Date: Jul 2003 Location: Collinsville, Illinois Posts: 86	Also, AfterEffects has a filter that corrects fish-eye distortion Cheers, Mark Jefferson

January 22nd, 2004, 09:43 AM	#5
Bill Pryor Contributor Join Date: Jan 2003 Location: Kansas City, MO Posts: 4,449	One reason for using a fisheye is to get the distortion. As the above post suggested, dump the fisheye and go with a wide angle, although when you tilt it up or down you probably will get some distortion near the edges.

January 22nd, 2004, 02:05 PM	#6
Mark Jefferson Regular Crew Join Date: Jul 2003 Location: Collinsville, Illinois Posts: 86	Actually, the AE filter warps the image so it is (relatively) straight. You don't lose any field of view.