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Last Post 22 May 2006 11:35 AM by  anon
Bad Line Correction
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anon



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22 May 2006 11:35 AM
    Dear Friends, I have a pushbroom hyperspectral imaging system, which scans from 1000 to 1800 nm. The camera is equipped with an InGaS detector array of size 320 x 243 (spatial x spectral); and it has about 2% bad pixels. So, in the hyperspectral image, for each bad pixel, I am getting a bad line. The location of bad line varies from one band to the other and some of them are visible only at particular band. I tried to run PCA. But it couldn't get through because the image had -NaN values along the bad line. Please suggest some ways to correct the bad lines. Are there any built-in functions availabe in ENVI to handle such problems? or Do I need to write my own IDL code? Thanks KN

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    22 May 2006 11:35 AM
    Easy enough to fix: Transform--->PCA--->Forward--->Compute New Statistics and Rotate Select your image When you do this, you should get an option for Mask Band. Beside this is a Mask Options button. So, you can go: Mask Options--->Build Mask This will bring up a window entitled Mask Defintion. There is a Options button on this. Options--->Mask NaN Values Select your image. The rest is pretty straightforward. Don't forget to turn the mask pixels off, not on. Brad -------------------------------------------------------------------------------------------------- Brad Wallet President and Chief Scientist Automated Decisions, LLC consulting@automateddecisions.com
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