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Re: RMS error [message #39392 is a reply to message #39379]

Tue, 11 May 2004 16:23

David Fanning
Messages: 11724
Registered: August 2001

Senior Member

Rick Towler writes:

> A couple of questions:
>
> 1) Shouldn't you first cast img_1 and img_2 to something other than byte?
> Subtracting byte arrays will result in points that wrap:
>
> IDL> print, 213B-215B
> 254
>
> When you really want:
>
> IDL> print, 213s-215s
> -2

Yes, of course. I assumed these were 16-bit images,
because, well..., I just did. :-)

> 2) Is this correct for true color images?

Don't know. I've never done this myself. I was just up
getting a cup of tea when the message came in and I
happened to have my Gonzalez and Woods sitting at hand.
This is what I found when I looked RMS error up in the
index. It's what happens when you give a guy with a
compulsion to communicate a little bit of knowledge. :-(

Cheers,

David

--
David Fanning, Ph.D.
Fanning Software Consulting
Coyote's Guide to IDL Programming: http://www.dfanning.com/

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[Message index]

		Re: RMS error By: David Fanning on Thu, 13 May 2004 06:36
		Re: RMS error By: julio on Thu, 13 May 2004 06:22
		Re: RMS error By: Craig Markwardt on Wed, 12 May 2004 08:11
		Re: RMS error By: James Kuyper on Wed, 12 May 2004 08:02
		Re: RMS error By: Paul Van Delst[1] on Wed, 12 May 2004 07:56
		Re: RMS error By: David Fanning on Wed, 12 May 2004 07:42
		Re: RMS error By: Craig Markwardt on Wed, 12 May 2004 07:13
		Re: RMS error By: David Fanning on Tue, 11 May 2004 16:23
		Re: RMS error By: Rick Towler on Tue, 11 May 2004 15:34
		Re: RMS error By: David Fanning on Tue, 11 May 2004 14:14

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