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Correctly apply LCP "distortion" correction for Fisheye lenses

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Note: as discussed e.g. at http://lensfun.sourceforge.net/manual/corrections.html, this is really a combination of distortion correction and change of projection (from fisheye to rectilinear), but "distortion correction" is how the Adobe camera model calls it, and this is how it appears in the RT gui
This commit is contained in:
Alberto Griggio
2017-04-08 10:13:53 +02:00
parent 73e14702dd
commit 871c75e494
3 changed files with 65 additions and 26 deletions
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38
rtengine/iptransform.cc
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@@ -85,16 +85,17 @@ float normn (float a, float b, int n)
}
}
void correct_distortion (const rtengine::LCPMapper *lcp, double &x, double &y,
int cx, int cy)
void correct_distortion(const rtengine::LCPMapper *lcp, double &x, double &y,
int cx, int cy, double scale)
{
assert (lcp);
x += cx;
y += cy;
lcp->correctDistortion (x, y);
x -= cx;
y -= cy;
lcp->correctDistortion(x, y, scale);
x -= (cx * scale);
y -= (cy * scale);
}
}
@@ -156,11 +157,14 @@ bool ImProcFunctions::transCoord (int W, int H, const std::vector<Coord2D> &src,
double x_d = src[i].x, y_d = src[i].y;
if (pLCPMap && params->lensProf.useDist) {
correct_distortion (pLCPMap, x_d, y_d, 0, 0);
correct_distortion (pLCPMap, x_d, y_d, 0, 0, ascale);
} else {
x_d *= ascale;
y_d *= ascale;
}
y_d = ascale * (y_d - h2);
x_d = ascale * (x_d - w2);
x_d += ascale * (0 - w2); // centering x coord & scale
y_d += ascale * (0 - h2); // centering y coord & scale
if (needsPerspective()) {
// horizontal perspective transformation
@@ -799,11 +803,14 @@ void ImProcFunctions::transformHighQuality (Imagefloat* original, Imagefloat* tr
double x_d = x, y_d = y;
if (enableLCPDist) {
correct_distortion (pLCPMap, x_d, y_d, cx, cy); // must be first transform
correct_distortion(pLCPMap, x_d, y_d, cx, cy, ascale); // must be first transform
} else {
x_d *= ascale;
y_d *= ascale;
}
x_d = ascale * (x_d + cx - w2); // centering x coord & scale
y_d = ascale * (y_d + cy - h2); // centering y coord & scale
x_d += ascale * (cx - w2); // centering x coord & scale
y_d += ascale * (cy - h2); // centering y coord & scale
double vig_x_d = 0., vig_y_d = 0.;
@@ -976,11 +983,14 @@ void ImProcFunctions::transformPreview (Imagefloat* original, Imagefloat* transf
double x_d = x, y_d = y;
if (pLCPMap && params->lensProf.useDist) {
correct_distortion (pLCPMap, x_d, y_d, cx, cy); // must be first transform
correct_distortion(pLCPMap, x_d, y_d, cx, cy, ascale); // must be first transform
} else {
x_d *= ascale;
y_d *= ascale;
}
y_d = ascale * (y_d + cy - h2); // centering y coord & scale
x_d = ascale * (x_d + cx - w2); // centering x coord & scale
x_d += ascale * (cx - w2); // centering x coord & scale
y_d += ascale * (cy - h2); // centering y coord & scale
double vig_x_d = 0., vig_y_d = 0.;