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Re: inverting a binary image(array)? [message #78285 is a reply to message #78284]

Sun, 06 November 2011 07:24

Jim Pendleton
Messages: 165
Registered: November 2011

Senior Member

On Nov 4, 3:54 pm, desertdryad <dry...@gmail.com> wrote:
> What's the most streamlined way to do this?

In the ENVI environment, you might consider writing a simple band math
user function.

Look for the "Band and Spectral" math section of the ENVI Programmer's
Guide in the online help.

You'll then have a function you can reuse in other contexts within
ENVI.

ENVI will tile the data as necessary so if the image is very large you
won't exhaust memory.

For extra points, use the TEMPORARY function and use the same data
type as the input band to prevent upcasting and unnecessary data
copying, (e.g., for byte data: RETURN, 1B - TEMPORARY(b1), for
unsigned short data: RETURN, 1US - TEMPORARY(b1)).

Social media alert: I work for Exelis VIS, but any implied or
expressed opinions are my own.

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[Message index]

		Re: inverting a binary image(array)? By: desertdryad on Mon, 07 November 2011 11:58
		Re: inverting a binary image(array)? By: M. Katz on Mon, 07 November 2011 00:00
		Re: inverting a binary image(array)? By: Jim Pendleton on Sun, 06 November 2011 07:24
		Re: inverting a binary image(array)? By: Jeremy Bailin on Sat, 05 November 2011 21:29
		Re: inverting a binary image(array)? By: David Fanning on Fri, 04 November 2011 16:09

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