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Mapping image into a polar-square coordinate [message #61212]

Tue, 08 July 2008 22:36

Camilo Mejia
Messages: 4
Registered: July 2008

Junior Member

Hi programmers,

I have an image and I want to map an annulus of it (matrix 981X 981)
onto a rectangular axes whose columns are the angle, and the rows are
the radius to the central pixel. I tried:

;data has the image
xx1 = findgen(4096,10)*0.
for i=0,1023 do begin
roll=i*360./4096.
SB=rot(data,-roll,1,490.5,490.5,cubic=-0.5,missing=-1,/pivot )
xx1[i,*]=SB[50:59,490]
for j=0,9 do xx1[i+2048,j]=SB[930-j,490]
xx1[i+3072,*]=SB[490,50:59]
for j=0,9 do xx1[i+1024,j]=SB[490,930-j]
endfor

But it takes too long to run, i need something faster. Any advise?
Thanks

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