Constructive Approaches to Perception-Aware Lossy Source Coding: Information-Theoretic Guidelines

TL;DR

This paper surveys information-theoretic principles for designing perception-aware lossy source coding systems, providing practical guidelines and illustrating key ideas through a simple example to bridge theory and implementation.

Contribution

It offers a comprehensive overview of rate-distortion-perception theory and guides the development of constructive, implementable perception-aware compression schemes.

Findings

Practical guidelines derived from rate-distortion-perception theory.

Illustration of key concepts using a simple unit-circle example.

Clarification of the roles of common randomness and universal representation.

Abstract

Perception-aware lossy source coding has attracted significant recent interest. It augments the classical distortion criterion with an explicit perception constraint, thereby enabling more refined control over fidelity and perceptual quality. Despite rapid progress, the diversity of rate-distortion-perception formulations and their underlying assumptions remains poorly understood by many practitioners. In particular, there is often a tendency to rely heavily on the expressive power of deep neural networks and generative models without clear theoretical guidance, using fundamental limits merely as performance benchmarks rather than as sources of design insight. This tutorial paper aims to bridge this gap by surveying information-theoretic principles that can be leveraged to develop constructive approaches to perception-aware lossy source coding. We distill practical guidelines implied by rate-distortion-perception theory and demonstrate how they inform the design of implementable coding schemes. A simple unit-circle example is used as a pedagogical tool to illustrate key ideas, architectural principles, and tradeoffs in an intuitive and unified manner. Both one-shot and asymptotic settings are examined to highlight conceptual similarities and operational differences. We also clarify the role of common randomness and the notion of universal representation, and elucidate the connections between perception-aware and conventional lossy source coding. Overall, this tutorial provides a principled foundation for developing perception-aware compression systems that go beyond black-box model design.