THIS FIRST ONE SHOULD BE NONSENSE, AS SINGLE FIELD IS NOT ISOTROPIC,
AND MODEL DOESN'T TAKE INTO ACCOUNT ANISOTROPY
single field captured on SGI (edgware):
dots -r 7 -c 11 dots_elmo_mn401 
Input image size: (243 (y), 646 (x)). Frames: 1. Bytes/pixel : 1.
Hold on, working...
Working on dots_elmo_mn401/data.
Read 156978 bytes of input image data.
dots.c: assuming dots are white on a black background
 C O M    321.26978  121.27417    6.00000    4.00000 
 moment   201.28967    3.74166   53.79692 
 X , Y     53.52196   30.29871 
 linearity error (no correction)  117.53315 
 StartErr    66.58405   323.00   121.50 
 linearity error   66.58405 
 unit =  4.000000 
 unit =  2.000000 
 unit =  1.000000 
 unit =  0.500000 
 unit =  0.250000 
 unit =  0.125000 
 unit =  0.062500 
Final Best quarter pixel resolution:   40.20451   315.94   116.81 
Final poly 4.129105e-12 0.000000e+00 -1.928883e-08 0.000000e+00 9.808859e-01 
 linearity error   40.20451 
now run: swarp -w -x  315.94 -y  116.81 -a 9.808875362e-01 -b -1.928886294e-08 -c 4.129111790e-12 -o outfile infile




single field captured on SGI (edgware) after upsampling:
dots -r 7 -c 11 dots_elmo_mn401
Input image size: (486 (y), 646 (x)). Frames: 1. Bytes/pixel : 1.
Hold on, working...
Working on dots_elmo_mn401/data.
Read 313956 bytes of input image data.
dots.c: assuming dots are white on a black background
 C O M    321.26971  243.04825    6.00000    4.00000 
 moment   236.47252    3.74166   63.19994 
 X , Y     53.52195   60.72289 
 linearity error (no correction)  232.57999 
 StartErr     3.15694   323.00   243.00 
 linearity error    3.15694 
 unit =  4.000000 
 unit =  2.000000 
 unit =  1.000000 
 unit =  0.500000 
 unit =  0.250000 
 unit =  0.125000 
 unit =  0.062500 
Final Best quarter pixel resolution:    1.15683   312.06   228.25 
Final poly 2.969898e-13 0.000000e+00 2.779292e-07 0.000000e+00 9.760254e-01 
 linearity error    1.15683 
now run: swarp -w -x  312.06 -y  228.25 -a 9.760263567e-01 -b 2.779294222e-07 -c 2.969901299e-13 -o outfile infile





elmo MN401 with 7.5mm lens, captured on Ajeco and transmitted to WWW page:
dots_elmo_mn401_7.5_ajeco.jpg
dots -r 7 -c 11 dots_elmo_mn401
Input image size: (520 (y), 640 (x)). Frames: 1. Bytes/pixel : 1.
Hold on, working...
Working on dots_elmo_mn401/data.
Read 332800 bytes of input image data.
dots.c: assuming dots are white on a black background
 C O M    320.82010  260.75003    6.00000    4.00000 
 moment   237.54640    3.74166   63.48695 
 X , Y     53.44561   65.16392 
 linearity error (no correction)  231.85234 
 StartErr     4.51777   320.00   260.00 
 linearity error    4.51777 
 unit =  4.000000 
 unit =  2.000000 
 unit =  1.000000 
 unit =  0.500000 
 unit =  0.250000 
 unit =  0.125000 
 unit =  0.062500 
Final Best quarter pixel resolution:    1.03636   300.81   246.31 
Final poly 3.396365e-13 0.000000e+00 2.648101e-07 0.000000e+00 9.762668e-01 
 linearity error    1.03636 
now run: swarp -w -x  300.81 -y  246.31 -a 9.762688152e-01 -b 2.648105984e-07 -c 3.396371983e-13 -o outfile infile