void HornSchunck::compute(const CImg< unsigned char > &I1,
const CImg< unsigned char > &I2,
CImg< double > &V)
{
int x, y, i;
double uAvg, vAvg;
double numer, denom;
width_ = I1.dimx();
height_ = I1.dimy();
CImg< double > V_;
V_.assign(V, true);
computeGradients_(I1, I2);
for(i = 0; i < NUM_ITERATIONS_; i++)
{
for(y = 1; y < height_ - 1; y++)
{
//#pragma omp parallel for ordered schedule(static) shared(V_) private(numer,denom,uAvg,vAvg)
for(x = 1; x < width_ - 1; x++)
{
uAvg = (V_(x, y-1, 0) + V_(x+1, y, 0) +
V_(x, y+1, 0) + V_(x-1, y, 0)) / 6.0 +
(V_(x-1, y-1, 0) + V_(x+1, y-1, 0) +
V_(x-1, y+1, 0) + V_(x+1, y+1, 0)) / 12.0;
vAvg = (V_(x, y-1, 1) + V_(x+1, y, 1) +
V_(x, y+1, 1) + V_(x-1, y, 1)) / 6.0 +
(V_(x-1, y-1, 1) + V_(x+1, y-1, 1) +
V_(x-1, y+1, 1) + V_(x+1, y+1, 1)) / 12.0;
numer = Gx_(x, y)*uAvg + Gy_(x, y)*vAvg + Gt_(x, y);
denom = ALPHA_*ALPHA_ + Gx_(x, y)*Gx_(x, y) + Gy_(x, y)*Gy_(x, y);
//#pragma omp ordered
V_(x, y, 0) = (1.0 - RELAX_COEFF_) * V_(x, y, 0) +
RELAX_COEFF_ * (uAvg - Gx_(x, y)*numer/denom);
V_(x, y, 1) = (1.0 - RELAX_COEFF_) * V_(x, y, 1) +
RELAX_COEFF_ * (vAvg - Gy_(x, y)*numer/denom);
V_(x, y, 2) = 1.0;
}
}
repairEdges_(V_);
printProgressBar_(1.0*i / (NUM_ITERATIONS_ - 1));
}
std::cout<<std::endl;
}
void Proesmans::compute(const CImg< unsigned char > &I1,
const CImg< unsigned char > &I2,
CImg< double > &VF,
CImg< double > &VB)
{
int i, j;
int x, y;
double vAvg[2];
double xd, yd;
double It;
double vNext[2];
width_ = I1.dimx();
height_ = I1.dimy();
I_[0].assign(I1, true);
I_[1].assign(I2, true);
V_[0].assign(VF, true);
V_[1].assign(VB, true);
computeGradients_(I_[0], G_[0]);
computeGradients_(I_[1], G_[1]);
gamma_[0] = CImg< double >(width_, height_);
gamma_[1] = CImg< double >(width_, height_);
for(i = 0; i < NUM_ITERATIONS_; i++)
{
if(i < NUM_ITERATIONS_)
computeConsistencyMaps_();
for(y = 1; y < height_ - 1; y++)
{
for(x = 1; x < width_ - 1; x++)
{
for(j = 0; j < 2 ; j++)
{
computeAvg_(x, y, gamma_[j], V_[j], &vAvg[0]);
xd = x + vAvg[0];
yd = y + vAvg[1];
//iteration step
if(xd >= 0 && xd <= width_ - 1 && yd >= 0 && yd <= height_ - 1)
{
It = (I_[1 - j].linear_at2(xd, yd) - I_[j].at2(x, y)) * INTENSITY_SCALE_;
IterationStep_(G_[j](x, y, 0), G_[j](x, y, 1), It, vAvg, &vNext[0]);
}
else
{
// use consistency-weighted average as the next value
// if (xd,yd) is outside the image
vNext[0] = vAvg[0];
vNext[1] = vAvg[1];
}
if(i < NUM_ITERATIONS_)
{
V_[j](x, y, 0) = vNext[0];
V_[j](x, y, 1) = vNext[1];
}
}
// store quality information (gamma)
if(i < NUM_ITERATIONS_)
{
VF(x, y, 2) = gamma_[0](x, y);
VB(x, y, 2) = gamma_[1](x, y);
}
}
}
if(i < NUM_ITERATIONS_ && BOUNDARY_CONDITIONS_ == NEUMANN)
{
repairEdges_(V_[0]);
repairEdges_(V_[1]);
}
}
}
