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x-trans: Improved interpolation for red/blue pixels at blue/red locations, Issue 2415 #233

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2015-02-25 21:24:26 +01:00
parent a885e845ec
commit de736caf91
1 changed files with 10 additions and 5 deletions
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15
rtengine/demosaic_algos.cc
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@@ -3730,20 +3730,25 @@ void RawImageSource::xtrans_interpolate (int passes, bool useCieLab)
}
/* Interpolate red for blue pixels and vice versa: */
for (int row=top+1; row < mrow-1; row++) {
i = (row-sgrow) % 3 ? TS:1;
int leftstart = left+1;
for (int row=top+3; row < mrow-3; row++) {
int leftstart = left+3;
for(;leftstart<mcol-1;leftstart++)
if(fcol(row,leftstart)!=1)
break;
const int coloffset = (RightShift[(row)%6] == 1 ? 3:1);
for (int col=leftstart; col < mcol-1; col+=coloffset) {
c = (row-sgrow) % 3 ? TS:1;
h = 3 * (c ^ TS ^ 1);
for (int col=leftstart; col < mcol-3; col+=coloffset) {
if ((f = 2-fcol(row,col)) == 1)
continue;
rix = &rgb[0][row-top][col-left];
for (d=0; d < 4; d++, rix += TS*TS)
for (d=0; d < 4; d++, rix += TS*TS) {
i = d > 1 || ((d ^ c) & 1) ||
((fabsf(rix[0][1]-rix[c][1])+fabsf(rix[0][1]-rix[-c][1])) < 2.f*(fabsf(rix[0][1]-rix[h][1])+fabsf(rix[0][1]-rix[-h][1]))) ? c:h;
rix[0][f] = CLIP(0.5f*(rix[i][f] + rix[-i][f] +
rix[0][1] + rix[0][1] - rix[i][1] - rix[-i][1]));
}
}
}