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#!/bin/csh -f
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# RCSid: $Id: pacuity.csh,v 3.5 2005/02/16 05:40:11 greg Exp $
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#
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# Adjust picture acuity according to human visual abilities
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#
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if ($#argv != 1) then
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echo "Usage: $0 input.hdr > output.hdr"
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exit 1
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endif
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set td=/tmp
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set tfc1=$td/ac$$.cal
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set tf=($td/c{1,2,4,8,16,32}d$$.hdr $tfc1)
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set ifile=$1
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onintr quit
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tabfunc -i acuity > $tfc1 << EOF
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# Log10 luminance vs. visual acuity in cycles/degree
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-2.804 2.09
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-2.363 3.28
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-2.076 3.79
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-1.792 4.39
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-1.343 6.11
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-1.057 8.83
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-0.773 10.94
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-0.371 18.66
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-0.084 23.88
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0.2 31.05
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0.595 37.42
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0.882 37.68
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1.166 41.60
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1.558 43.16
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1.845 45.30
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2.129 47.00
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2.577 48.43
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2.864 48.32
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3.148 51.06
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3.550 51.09
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EOF
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set pres=(`getinfo -d < $ifile | sed 's/^-Y \([1-9][0-9]*\) +X \([1-9][0-9]*\)$/\2 \1/'`)
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set vp=`vwright V < $ifile`
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set aext=(`pextrem -o $ifile | rcalc -f $tfc1 -e 'max(a,b):if(a-b,a,b);$1=acuity(log10(max(179*(.265*$3+.67*$4+.065*$5),1e-4)))'`)
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( rcalc -e "$vp" -e "A:3438*sqrt(Vhn/$pres[1]*Vvn/$pres[2])" \
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-e 'f=60/A/2/$1;cond=if(1.5-$1,1,if(1-f,-1,if($1-'"$aext[2]"',-1,$1-'"$aext[1])))" \
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-o 'pfilt -1 -r 2 -x /${f} -y /${f} '"$ifile | pfilt -1 -r 1 -x $pres[1] -y $pres[2] > $td/"'c${$1}d'$$.hdr \
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| csh -f ) << EOF
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1
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2
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4
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8
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16
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32
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EOF
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cat >> $tfc1 << _EOF_
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max(a,b) : if(a-b, a, b);
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target_acuity = acuity(log10(max(WE/le(1)*li(1),1e-4)));
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findfuzzy(i) = if(target_acuity-picture_acuity(i),i,if(i-1.5,findfuzzy(i-1),1));
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fuzzy_picture = findfuzzy(nfiles-1);
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clear_picture = fuzzy_picture + 1;
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clarity_ex = (target_acuity-picture_acuity(fuzzy_picture)) /
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(picture_acuity(clear_picture)-picture_acuity(fuzzy_picture));
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clarity = if(clarity_ex-1, 1, if(-clarity_ex, 0, clarity_ex));
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ro = clarity*ri(clear_picture) + (1-clarity)*ri(fuzzy_picture);
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go = clarity*gi(clear_picture) + (1-clarity)*gi(fuzzy_picture);
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bo = clarity*bi(clear_picture) + (1-clarity)*bi(fuzzy_picture);
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picture_acuity(n) : select(n,1,
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_EOF_
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set pf=($td/c1d$$.hdr)
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foreach i (2 4 8 16 32)
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if ( -f $td/c${i}d$$.hdr ) then
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set pf=( $pf $td/c${i}d$$.hdr )
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echo -n "$i," >> $tfc1
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endif
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end
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set pf=( $pf $ifile )
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rcalc -n -e "$vp" -e "A:3879*sqrt(Vhn/$pres[1]*Vvn/$pres[2])" \
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-o '${60/A});' >> $tfc1
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getinfo < $ifile | egrep '^((VIEW|EXPOSURE|PIXASPECT|PRIMARIES|COLORCORR)=|[^ ]*(rpict|rview|pinterp) )'
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pcomb -f $tfc1 $pf
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quit:
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rm -f $tf
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