Spatial quantization guided by retinal eccentricity. Color precision is progressively reduced from the fovea toward the periphery, while dithering and blur recovery preserve the appearance of the ground truth.
Abstract
Head-mounted displays demand extreme data bandwidth, yet traditional pipelines allocate uniform color precision across the entire frame, ignoring the rapid decline of chromatic sensitivity as retinal eccentricity increases. This paper proposes a real-time perceptual spatial quantization method that modulates bit depth based on retinal eccentricity rather than maintaining per-pixel precision. Through a psychophysical study, we model the detection threshold of our method across quantization levels ranging from 24 to 3 bits per pixel, the minimal level. Our method is the first to achieve this level of color reduction without detection, as it takes advantage of lowered peripheral color perception in tandem with the visual pooling effect. By integrating our model into the theoretical bandwidth measure, we demonstrate that our method can achieve a data reduction of up to 83.5% compared to uniform quantization. Our findings suggest potential for reducing bandwidth in wireless streaming to minimize latency and optimizing DRAM traffic to save power in mobile VR/AR architectures. In summary, our work provides a strategy for high efficiency, perceptually lossless color reduction in foveated streaming systems.
Video
Interactive Demo
The desktop preview is provided for convenience; note that the perceptual effect is intended for head-mounted display viewing and may differ from the headset experience.
Motivation
Modern standalone VR and AR headsets are constrained by display bandwidth, wireless streaming latency, and on-device memory traffic. Foveated rendering already exploits the sharp drop in spatial acuity away from the gaze point, but color precision is often still treated as a uniform per-pixel budget.
This paper asks a complementary question: can color precision be reduced in the periphery without visible quality loss? Instead of only lowering spatial resolution or relying on codec parameters, the method directly controls chromatic precision in screen space.
The method aims to turn per-pixel color precision to spatial color perception. It takes advantage of two properties of human vision: First, chromatic sensitivity falls rapidly with retinal eccentricity, so color differences become much harder to detect in the periphery; second, the visual system pools local image structure over larger regions away from the fovea as visual acuity drops, which makes spatially distributed quantization error imperceptable.
BibTeX
@inproceedings{10.2312:sr.20261013, booktitle = {Rendering 2026 Industry Track}, editor = {Gkioulekas, Ioannis and Jarabo, Adrian}, title = {{Rethinking Color Precision: Real-Time Perceptual Spatial Quantization for Foveated Rendering}}, author = {Z. Zhu and G.D. Love and R.K. Dos Anjos}, year = {2026}, publisher = {The Eurographics Association}, ISSN = {1727-3463}, ISBN = {978-3-03868-320-9}, DOI = {10.2312/sr.20261013}}