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Re: subpixel image movement by bicubic interpolation?
| Re: subpixel image movement by bicubic interpolation? [message #11884] |
Thu, 04 June 1998 00:00 |
meinel
Messages: 14
Registered: February 1994
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Junior Member |
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In article <35757C9B.5E9AD577@as.arizona.edu>,
Dyer Lytle <dlytle@as.arizona.edu> wrote:
>
> Hello all
>
> I have an IDL program that requires images to be moved by
> very small amounts, often as little as one hundredth of a
> pixel.
> So I thought I'd ask if anyone has a sub-pixel image movement
> routine based on bicubic interpolation that they would be willing
> to share.
>
Here's a couple of items of interest for image processing:
1) You are not moving the image by 1/100 pixel -- you are increasing your
measurement uncertainty by 1/100 pixel.
2) *ALL* image interpolation methods introduce non-physical artifacts.
For your particular case, I recommend that you hike across the street and talk
to Bobby Hunt (hunt@ece.arizona.edu). He could give you some suggestions on
what to do with your data.
Ed Meinel
meinel@aero.org
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