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Re: Array indices and lookup tables [message #39719 is a reply to message #39714]

Thu, 10 June 2004 01:39

Chris Lee
Messages: 101
Registered: August 2003

Senior Member

In article <ca72v6$qlb$1@aplcore.jhuapl.edu>, "Haje Korth"
<haje.korth@jhuapl.edu> wrote:

> Good morning all,
> I am working on a coordinate transformation for a map and I have a
> simple problem. My mind is alreay blocked early in the morning and I
> could use some input: I have an rgb image of dimensions [3,1440, 720]. I
> need to rearranged the pixel in the image according to a lookup table of
> dimension [2,1440,360], which contains the column and row of the new
> pixel assigned to a location. Is there a magic way to do this without
> looping through each pixel in IDL?
> Thanks for helping,
> Haje
>

The lookup table....Why is there only 360 points in the third dimension,
not 720?

I'm assuming the dimensions go as:
1st: [column, row]
2nd: new X location
3rd: new Y location

If the 2nd and 3rd dimensions are the location of the point in the new
image then you have a list of 1440*360
points linking the old coordinates to the new grid?

TRIANGULATE and TRIGRID should work then? using the XOUT and YOUT
keywords to set your output grid.

Chris.

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[Message index]

		Re: Array indices and lookup tables By: David Fanning on Thu, 10 June 2004 06:59
		Re: Array indices and lookup tables By: David Fanning on Thu, 10 June 2004 06:57
		Re: Array indices and lookup tables By: Haje Korth on Thu, 10 June 2004 06:11
		Re: Array indices and lookup tables By: Chris Lee on Thu, 10 June 2004 01:39
		Re: Array indices and lookup tables By: Haje Korth on Wed, 09 June 2004 07:49
		Re: Array indices and lookup tables By: David Fanning on Wed, 09 June 2004 07:26
		Re: Array indices and lookup tables By: Haje Korth on Wed, 09 June 2004 07:06
		Re: Array indices and lookup tables By: David Fanning on Wed, 09 June 2004 06:42
		Re: Array indices and lookup tables By: Chris Lee on Thu, 10 June 2004 10:15

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