[Tutor] Help on image creation and display from ASCII files

Bill Mill bill.mill at gmail.com
Thu Nov 4 19:16:59 CET 2004


GIYF. http://spectralpython.sourceforge.net/ .

Bill Mill
bill.mill at gmail.com

On Thu, 4 Nov 2004 17:08:11 -0000, Gavin Hunt <hscl at gotadsl.co.uk> wrote:
> Hi,
> I'm a newbie to python and wxpython, recently converting from the excellent
> but very costly IDL environment.
> I wish to rewrite my IDL program in which separate but consecutive ASCII
> output files from my line-scanning camera - each in the form of a CSV file
> of 256 * 600 floating point values - are read into a 3D (hyperspectral)
> image.  The X and Z dimensions of the image remain the same, i.e. 256
> diodes and 600 channels, but the Y dimension obviously increases as the
> number of line scans increase.
> This image is displayed to screen and refreshed each time a new scan line
> is added to the output image.  Only three of the 600 channels available in
> the hyperspectral image will be displayed in RGB format.  In addition,
> there should be scope to interrogate the image interactively with a cursor
> and display a spectral plot (600 channels) of any image pixel.
> i) Does anybody have any scripts that can read ASCII files and create an
> hyperspectral image?
> ii) Ditto scripts to display and refresh the image in real time?
> iii) Interact with the image and plot an image spectrum using a cursor to
> get the image X, Y co-ordinate?
> If not how do I convert between ASCII and image format - easy to do in IDL?
> Display the image on a line by line basis?
> Thnx
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