Randomise pixels in image

Thu, 05/11/2017 - 05:34 am

This quick snippet will move pixels to (semi) random locations in each image in a stack. The output is saved as a new 3D wave called outWave. I wrote this for an analysis routine where I needed to assess correlation in a masked region of two images. The randomised version allows me to see what correlation we would expect by chance.


Function RandomiseImage(inWave)
 Wave inWave
 Duplicate/O inWave, outWave
 
 Variable xx = dimsize(inWave,0)
 Variable yy = dimsize(inWave,1)
 Variable zz = dimsize(inWave,2)
 
 Variable i
 
 for(i = 0; i < zz; i += 1)
 MatrixOp/O/FREE tempLayer = layer(inWave,i)
 Redimension/N=(xx*yy) tempLayer
 StatsSample/N=(xx*yy) tempLayer
 WAVE/Z W_Sampled
 Redimension/N=(xx,yy) W_Sampled
 outWave[][][i] = W_Sampled[p][q]
 endfor
End

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