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greg |
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{ RCSid $Id$ } |
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{ |
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Correct fisheye image using a distortion function: |
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rad(r) = function of r in [0,.5] range, returing same |
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This function takes the pixel distance from the image center, where |
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1.0 is the full width of the image constituting 180-degrees of view. |
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The output is the corrected distance from the center for the output. |
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pcomb -e 'rad(r)=my_function(r)' -f fisheye_corr.cal \ |
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-o fisheye.hdr > corrected.hdr |
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We also clear the region outside the r=[0,.5] circle to black. |
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Note that you will need to add back the VIEW= line to the header, e.g.: |
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echo "VIEW= -vta -vh 180 -vv 180" > corrected.hdr |
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(above_command) >> corrected.hdr |
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} |
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xc : xres/2; |
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yc : yres/2; |
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sq(x) : x*x; |
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r = sqrt(sq((x-xc)/xres) + sq((y-yc)/yres)); |
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mapped_r = rad(r); |
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{ If your mapping goes the other way, invert the multiplier with: |
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rmult = r/(mapped_r+1e-7); |
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} |
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rmult = mapped_r/(r+1e-7); |
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xoff = (x-xc)*(1-rmult); |
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yoff = (y-yc)*(1-rmult); |
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ro=if(.5-mapped_r, ri(1,xoff,yoff), 0); |
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go=if(.5-mapped_r, gi(1,xoff,yoff), 0); |
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bo=if(.5-mapped_r, bi(1,xoff,yoff), 0); |
