The analytic solution:
Monte Carlo, 16 random samples:
Monte Carlo, 16 stratified samples:
Monte Carlo, 100 random samples:
Monte Carlo, 100 stratified samples:
Monte Carlo, 100 random samples with bspline filter:
Density estimation, 100 random samples per pixel on average:
Density estimation, 100 stratified samples per pixel on average:
Metropolis with 1 iteration
Metropolis with 2 iterations
Metropolis with 4 iterations
Metropolis with 8 iterations
Metropolis with 16 iterations
Metropolis with 32 iterations