| 1 |
greg |
3.1 |
#!/bin/csh -f
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| 2 |
greg |
3.3 |
# RCSid: $Id: psquish.csh,v 3.2 2003/02/22 02:07:27 greg Exp $
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| 3 |
greg |
3.1 |
set Lmin=.0001 # minimum visible world luminance
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set Ldmin=1 # minimum display luminance
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| 5 |
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set Ldmax=100 # maximum display luminance
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set nsteps=100 # number of steps in perceptual histogram
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| 7 |
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set cvratio=0.05 # fraction of pixels to ignore in envelope clipping
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set td=/usr/tmp
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set tf0=$td/tf$$
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set tf1=$td/hist$$
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set tf1b=$td/hist$$.diff
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set tf2=$td/cumt$$
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set tf3=$td/histeq$$.cal
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set tf4=$td/cf$$.cal
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set tf=($tf0 $tf1 $tf1b $tf2 $tf3 $tf4)
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if ( "$argv[1]" == "-a" ) then
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set adaptive
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shift argv
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endif
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if ( $#argv != 1 ) then
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echo "Usage: $0 [-a] input.pic > output.pic"
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exit 1
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endif
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set ifile=$1
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set ibase=$ifile:t
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if ( "$ibase" =~ *.pic ) set ibase=$ibase:r
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set ibase=$ibase:t
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onintr quit
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pextrem -o $ifile > $tf0
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set Lmin=`rcalc -e 'L=179*(.265*$3+.67*$4+.065*$5)' -e 'cond=1.5-recno;$1=if('L-$Lmin,L,$Lmin')' $tf0`
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set Lmax=`rcalc -e 'L=179*(.265*$3+.67*$4+.065*$5)' -e 'cond=recno-1.5;$1=if('$Ldmax-L,$Ldmax,L')' $tf0`
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cat > $tf3 << _EOF_
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min(a,b) : if(a-b, b, a);
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WE : 179; { Radiance white luminous efficacy }
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Lmin : $Lmin ; { minimum visible luminance }
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Lmax : $Lmax ; { maximum picture luminance }
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Ldmin : $Ldmin ; { minimum output luminance }
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Ldmax : $Ldmax ; { maximum output luminance }
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Stepsiz : (Bl(Lmax)-Bl(Lmin))/ $nsteps ; { brightness step size }
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{ Logarithmic brightness function }
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Bl(L) : log(L);
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Lb(B) : exp(B);
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BLw(Lw) : Bl(Ldmin) + (Bl(Ldmax)-Bl(Ldmin))*cf(Bl(Lw));
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{ first derivative functions }
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Bl1(L) : 1/L;
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Lb1(B) : exp(B);
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{ histogram equalization function }
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lin = li(1);
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Lw = WE/le(1) * lin;
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Lout = Lb(BLw(Lw));
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mult = if(Lw-Lmin, (Lout-Ldmin)/(Ldmax-Ldmin)/lin, 0) ;
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_EOF_
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if ( $?adaptive ) then
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cat >> $tf3 << _EOF_
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{ Ferwerda contrast sensitivity function }
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{ log10 of cone threshold luminance }
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ltp(lLa) : if(-2.6 - lLa, -.72, if(lLa - 1.9, lLa - 1.255,
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(.249*lLa + .65)^2.7 - .72));
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{ log10 of rod threshold luminance }
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lts(lLa) : if(-3.94 - lLa, -2.86, if(lLa - -1.44, lLa - .395,
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(.405*lLa + 1.6)^2.18 - 2.86));
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{ threshold is minimum of rods and cones }
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ldL2(lLa) : min(ltp(lLa),lts(lLa));
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dL(La) : 10^ldL2(log10(La));
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{ derivative clamping function }
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clamp2(L, bLw) : dL(Lb(bLw))/dL(L)/Lb1(bLw)/(Bl(Ldmax)-Bl(Ldmin))/Bl1(L);
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clamp(L) : clamp2(L, BLw(L));
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{ shift direction for histogram }
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shiftdir(B) : if(cf(B) - (B - Bl(Lmin))/(Bl(Ldmax) - Bl(Lmin)), 1, -1);
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{ Scotopic/Photopic color adjustment }
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sL(r,g,b) : .062*r + .608*g + .330*b; { approx. scotopic brightness }
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BotMesopic : 10^-2.25; { top of scotopic range }
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TopMesopic : 10^0.75; { bottom of photopic range }
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incolor = if(Lw-TopMesopic, 1, if(BotMesopic-Lw, 0,
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(Lw-BotMesopic)/(TopMesopic-BotMesopic)));
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slf = (1 - incolor)*sL(ri(1),gi(1),bi(1));
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ro = mult*(incolor*ri(1) + slf);
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go = mult*(incolor*gi(1) + slf);
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bo = mult*(incolor*bi(1) + slf);
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_EOF_
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else
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cat >> $tf3 << _EOF_
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{ derivative clamping function }
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clamp2(L, bLw) : Lb(bLw)/L/Lb1(bLw)/(Bl(Ldmax)-Bl(Ldmin))/Bl1(L);
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clamp(L) : clamp2(L, BLw(L));
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{ shift direction for histogram }
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shiftdir(B) : -1;
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ro = mult*ri(1);
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go = mult*gi(1);
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bo = mult*bi(1);
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_EOF_
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endif
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# Compute brightness histogram
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pfilt -1 -p 1 -x 128 -y 128 $ifile | pvalue -o -b -d -h -H \
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| rcalc -f $tf3 -e 'Lw=WE*$1;$1=if(Lw-Lmin,Bl(Lw),-1)' \
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| histo `ev "log($Lmin)" "log($Lmax)"` $nsteps > $tf1
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# Clamp frequency distribution
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set totcount=`sed 's/^.*[ ]//' $tf1 | total`
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set margin=`ev "floor($totcount*$cvratio+.5)"`
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while ( 1 )
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# Compute mapping function
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sed 's/^.*[ ]//' $tf1 | total -1 -r \
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greg |
3.3 |
| rcalc -e '$1=$1/'$totcount | rlam $tf1 - \
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greg |
3.1 |
| tabfunc -i 0 cf > $tf4
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# Compute difference with visible envelope
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rcalc -f $tf4 -f $tf3 -e "T:$totcount*Stepsiz" \
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-e 'clfq=floor(T*clamp(Lb($1))+.5)' \
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-e '$1=$2-clfq;$2=shiftdir($1)' $tf1 > $tf1b
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if (`sed 's/[ ].*$//' $tf1b | total` >= 0) then
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# Nothing visible? -- just normalize
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pfilt -1 -e `pextrem $ifile | rcalc -e 'cond=recno-1.5;$1=1/(.265*$3+.67*$4+.065*$5)'` $ifile
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goto quit
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endif
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# Check to see if we're close enough
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if (`rcalc -e '$1=if($1,$1,0)' $tf1b | total` <= $margin) break
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# Squash frequency distribution
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set diffs=(`sed 's/[ ].*$//' $tf1b`)
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set shftd=(`sed 's/^.*[ ]//' $tf1b`)
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while ( 1 )
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set maxi=0
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set maxd=0
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set i=$nsteps
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while ( $i > 0 )
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if ( $diffs[$i] > $maxd ) then
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set maxd=$diffs[$i]
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set maxi=$i
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endif
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@ i--
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end
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if ( $maxd == 0 ) break
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set i=0
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tryagain:
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set r=$shftd[$maxi]
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while ( $i == 0 )
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@ t= $maxi + $r
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if ( $t < 1 || $t > $nsteps ) then
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@ shftd[$maxi]= -($shftd[$maxi])
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goto tryagain
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endif
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if ( $diffs[$t] < 0 ) set i=$t
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@ r+= $shftd[$maxi]
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end
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if ( $diffs[$i] <= -$diffs[$maxi] ) then
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@ diffs[$i]+= $diffs[$maxi]
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set diffs[$maxi]=0
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else
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@ diffs[$maxi]+= $diffs[$i]
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set diffs[$i]=0
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endif
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end
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# Mung histogram
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greg |
3.3 |
echo $diffs | tr ' ' '\012' | rlam $tf1 - \
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| 153 |
greg |
3.1 |
| rcalc -f $tf4 -f $tf3 -e "T:$totcount*Stepsiz" \
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| 154 |
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-e 'clfq=floor(T*clamp(Lb($1))+.5)' \
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-e '$1=$1;$2=$3+clfq' > $tf1b
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| 156 |
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mv -f $tf1b $tf1
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end
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# Plot the mapping function if we are in debug mode
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if ( $?DEBUG ) then
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cat > ${ibase}_histo.plt << _EOF_
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include=curve.plt
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title="Brightness Frequency Distribution"
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subtitle= $ibase
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ymin=0
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xlabel="Perceptual Brightness B(Lw)"
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ylabel="Frequency Count"
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Alabel="Histogram"
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Alintype=0
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Blabel="Envelope"
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Bsymsize=0
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Adata=
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_EOF_
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(cat $tf1; echo \;; echo Bdata=) >> ${ibase}_histo.plt
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rcalc -f $tf4 -f $tf3 -e "T:$totcount*Stepsiz" \
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-e '$1=$1;$2=T*clamp(Lb($1))' $tf1 \
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>> ${ibase}_histo.plt
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cat > ${ibase}_brmap.plt << _EOF_
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include=line.plt
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| 179 |
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title="Brightness Mapping Function"
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| 180 |
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subtitle= $ibase
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| 181 |
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xlabel="World Luminance (log cd/m^2)"
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| 182 |
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ylabel="Display Luminance (cd/m^2)"
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| 183 |
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ymax= $Ldmax
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| 184 |
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Adata=
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| 185 |
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_EOF_
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| 186 |
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cnt 100 | rcalc -f $tf4 -f $tf3 -e '$1=lx;$2=Lb(BLw(10^lx))' \
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| 187 |
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-e 'lx=$1/99*(log10(Lmax)-log10(Lmin))+log10(Lmin)' \
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| 188 |
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>> ${ibase}_brmap.plt
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| 189 |
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if ( $?DISPLAY ) then
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| 190 |
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bgraph ${ibase}_histo.plt ${ibase}_brmap.plt | x11meta &
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| 191 |
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endif
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| 192 |
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endif
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| 193 |
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# Map our picture
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| 194 |
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getinfo < $ifile | egrep '^((VIEW|PIXASPECT|PRIMARIES)=|[^ ]*(rpict|rview|pinterp) )'
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| 195 |
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pcomb -f $tf4 -f $tf3 $ifile
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| 196 |
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quit:
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| 197 |
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rm -f $tf
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