Open shuochen365 opened 2 years ago
Hi, this is a very interesting work that solves a key problem in NeRF. I don’t quite understand your code for calculating variance. Can you explain why it is calculated like this?
d_outer = d[..., :, None] * d[..., None, :] eye = jnp.eye(d.shape[-1]) null_outer = eye - d[..., :, None] * (d / d_mag_sq)[..., None, :] t_cov = t_var[..., None, None] * d_outer[..., None, :, :] xy_cov = r_var[..., None, None] * null_outer[..., None, :, :] cov = t_cov + xy_cov
Section 1 of the supplemental material has a complete derivation.
Hi, this is a very interesting work that solves a key problem in NeRF. I don’t quite understand your code for calculating variance. Can you explain why it is calculated like this?