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A small saving

release/4.3a0
dellaert 2014-06-19 11:58:08 -04:00
parent 0e64c9495e
commit 12897a2c29
1 changed files with 21 additions and 20 deletions
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41
gtsam/geometry/Cal3DS2.cpp
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@ -66,32 +66,31 @@ static Matrix D2dcalibration(double x, double y, double xx, double yy,
}
/* ************************************************************************* */
static Matrix D2dintrinsic(double x, double y, double rr, double r4, double fx,
static Matrix D2dintrinsic(double x, double y, double rr, double g, double fx,
double fy, double s, double k1, double k2, double p1, double p2) {
const double drdx = 2 * x;
const double drdy = 2 * y;
const double g = 1 + k1 * rr + k2 * r4;
const double dgdx = k1 * drdx + k2 * 2 * rr * drdx;
const double dgdy = k1 * drdy + k2 * 2 * rr * drdy;
const double drdx = 2. * x;
const double drdy = 2. * y;
const double dgdx = k1 * drdx + k2 * 2. * rr * drdx;
const double dgdy = k1 * drdy + k2 * 2. * rr * drdy;
// Dx = 2*p1*xy + p2*(rr+2*xx);
// Dy = 2*p2*xy + p1*(rr+2*yy);
const double dDxdx = 2 * p1 * y + p2 * (drdx + 4 * x);
const double dDxdy = 2 * p1 * x + p2 * drdy;
const double dDydx = 2 * p2 * y + p1 * drdx;
const double dDydy = 2 * p2 * x + p1 * (drdy + 4 * y);
const double dDxdx = 2. * p1 * y + p2 * (drdx + 4. * x);
const double dDxdy = 2. * p1 * x + p2 * drdy;
const double dDydx = 2. * p2 * y + p1 * drdx;
const double dDydy = 2. * p2 * x + p1 * (drdy + 4. * y);
Matrix DK = (Matrix(2, 2) << fx, s, 0.0, fy);
Matrix DR = (Matrix(2, 2) << g + x * dgdx + dDxdx, x * dgdy + dDxdy, y * dgdx
+ dDydx, g + y * dgdy + dDydy);
Matrix DR = (Matrix(2, 2) << //
g + x * dgdx + dDxdx, x * dgdy + dDxdy, //
y * dgdx + dDydx, g + y * dgdy + dDydy);
return DK * DR;
}
/* ************************************************************************* */
Point2 Cal3DS2::uncalibrate(const Point2& p,
boost::optional<Matrix&> H1,
boost::optional<Matrix&> H2) const {
Point2 Cal3DS2::uncalibrate(const Point2& p, boost::optional<Matrix&> H1,
boost::optional<Matrix&> H2) const {
// rr = x^2 + y^2;
// g = (1 + k(1)*rr + k(2)*rr^2);
@ -107,16 +106,16 @@ Point2 Cal3DS2::uncalibrate(const Point2& p,
const double dy = 2. * p2_ * xy + p1_ * (rr + 2. * yy);
// Radial and tangential distortion applied
const double pnx = g*x + dx;
const double pny = g*y + dy;
const double pnx = g * x + dx;
const double pny = g * y + dy;
// Derivative for calibration
if (H1)
*H1 = D2dcalibration(x,y,xx,yy,xy,rr,r4,fx_,fy_,s_,pnx,pny);
*H1 = D2dcalibration(x, y, xx, yy, xy, rr, r4, fx_, fy_, s_, pnx, pny);
// Derivative for points
if (H2)
*H2 = D2dintrinsic(x, y, rr, r4, fx_, fy_, s_, k1_, k2_, p1_, p2_);
*H2 = D2dintrinsic(x, y, rr, g, fx_, fy_, s_, k1_, k2_, p1_, p2_);
// Regular uncalibrate after distortion
return Point2(fx_ * pnx + s_ * pny + u0_, fy_ * pny + v0_);
@ -156,7 +155,9 @@ Point2 Cal3DS2::calibrate(const Point2& pi, const double tol) const {
Matrix Cal3DS2::D2d_intrinsic(const Point2& p) const {
const double x = p.x(), y = p.y(), xx = x * x, yy = y * y;
const double rr = xx + yy;
return D2dintrinsic(x, y, rr, rr * rr, fx_, fy_, s_, k1_, k2_, p1_, p2_);
const double r4 = rr * rr;
const double g = (1 + k1_ * rr + k2_ * r4);
return D2dintrinsic(x, y, rr, g, fx_, fy_, s_, k1_, k2_, p1_, p2_);
}
/* ************************************************************************* */