Geometry Fidelity for Spherical Images

TL;DR

This paper introduces two new metrics, OmniFID and Discontinuity Score, to better evaluate geometric fidelity in spherical images, addressing limitations of traditional FID in capturing spherical geometry properties.

Contribution

The paper proposes two novel metrics specifically designed to quantify geometric fidelity in spherical images, improving upon existing evaluation methods like FID.

Findings

OmniFID captures field-of-view constraints in spherical images.

Discontinuity Score measures border seam continuity.

Metrics detect geometry issues missed by FID.

Abstract

Spherical or omni-directional images offer an immersive visual format appealing to a wide range of computer vision applications. However, geometric properties of spherical images pose a major challenge for models and metrics designed for ordinary 2D images. Here, we show that direct application of Fr\'echet Inception Distance (FID) is insufficient for quantifying geometric fidelity in spherical images. We introduce two quantitative metrics accounting for geometric constraints, namely Omnidirectional FID (OmniFID) and Discontinuity Score (DS). OmniFID is an extension of FID tailored to additionally capture field-of-view requirements of the spherical format by leveraging cubemap projections. DS is a kernel-based seam alignment score of continuity across borders of 2D representations of spherical images. In experiments, OmniFID and DS quantify geometry fidelity issues that are undetected by FID.