arXiv AI By Dhananjaya Jayasundara, Sudarshan Rajagopalan, Vishal M. Patel

SymKL: A Unified Representation-Space Measure of Signal Degradation

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SymKL is a unified full‑reference measure of signal degradation that uses implicit neural representations (INRs) fitted to a pristine reference. By evaluating the diagonal Fisher information of the INR for both the reference and a degraded observation, SymKL computes two parameter‑sensitivity profiles whose symmetric KL divergence yields a degradation score. The method requires only the reference and degraded signal, works across images, audio, and 3D data, and includes a closed‑form Fisher expression for SIREN, enabling efficient computation and accurate tracking of degradation severity.

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