Fitting Spherical Gaussians to Dynamic HDRI Sequences
This work addresses efficient storage and rendering of dynamic HDRI for computer graphics applications, but it is incremental as it builds on existing ASG methods.
The paper tackles the problem of compressing high dynamic range illumination sequences by fitting anisotropic spherical Gaussians while maintaining temporal consistency, achieving representation with a small number of ASGs.
We present a technique for fitting high dynamic range illumination (HDRI) sequences using anisotropic spherical Gaussians (ASGs) while preserving temporal consistency in the compressed HDRI maps. Our approach begins with an optimization network that iteratively minimizes a composite loss function, which includes both reconstruction and diffuse losses. This allows us to represent all-frequency signals with a small number of ASGs, optimizing their directions, sharpness, and intensity simultaneously for an individual HDRI. To extend this optimization into the temporal domain, we introduce a temporal consistency loss, ensuring a consistent approximation across the entire HDRI sequence.