Help with ImageInterpolate

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Wed, 02/03/2016 - 09:46 am

Hello,

I have 1024 by 1024 grayscale image, represented in IGOR in the form of a 2D wave of I8 Interger data type. I would like to resample the image to a higher resolution to determine the location of certain features with sub-pixel resolution.

When I perform

 ImageInterpolate/FUNC=bilinear/RESL={2048,2048} Resample image

Igor return that there is a syntax error and highlights the name of the wave. Any clues on as to why I get this error?

I also tried ImageInterpolate/D=2 Spline image in a first attempt and I got a different error (insufficient input).

Any help would be much appreciated, as there is little in the documentation in the ways of examples on the ImageInterpolate function.
I am not the real expert, but the author of the operation is on vacation.

It looks to me like you don't want Resample- the documentation (which is sort of terse :) seems to imply that Resample does some sort of transformation of the image. I think you want the Bilinear method. More like this:
ImageInterpolate/RESL={2048,2048} Bilinear image
The "syntax error" generated by Resample is not very helpful. I suspect the operation is expecting /TRNS flag. It appears that the Resample keyword requests a specialized operation meant for correcting certain kinds of camera distortion.

John Weeks
WaveMetrics, Inc.
support@wavemetrics.com

February 4, 2016 at 10:26 am - Permalink

Thanks for the reply! Indeed your syntax works. I'll keep playing around with ImageInterpolate it actually comes in handy for a variety of operations in my current experiment.

February 5, 2016 at 02:07 am - Permalink

kpantzas wrote:

When I perform
 ImageInterpolate/FUNC=bilinear/RESL={2048,2048} Resample image

Igor return that there is a syntax error and highlights the name of the wave. Any clues on as to why I get this error?


You are mixing the syntax of various mutually exclusive features. There is no need to use /FUNC here nor should you use Resample for this application. It seems from your description that all you need is:
ImageInterpolate/U=2 bilinear image


You can use the explicit resolution with /RESL or /F={fx,fy} but the /U is the simplest.

A.G.
WaveMetrics, Inc.

February 5, 2016 at 10:00 am - Permalink