用相移噪声掩盖凹面渲染中的 judder（抖动）
Masking Judder in Foveated Rendering with Phase-Shifted Noise
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中文总结 AI 辅助
本文提出一种用相移噪声掩盖凹面渲染中抖动的方法，通过选择合适空间频率噪声带实现感知层面的抖动掩盖，实验证实该方法可扩大低时间分辨率下流畅运动的角速度范围且图像质量无明显下降。
中文摘要 AI 辅助
当帧时间超过渲染预算时，渲染过程会出现低帧率，或者为节省计算资源可故意引入低帧率，例如在凹面渲染（foveated rendering）中，周边区域可采用降低的空间和时间分辨率进行渲染。然而低帧率也会导致运动不流畅，即 judder（抖动），从而降低感知图像质量。抖动表现为时空频率域中的混叠；时间滤波（如模糊）可抑制抖动，但会带来额外的计算成本并导致更大的细节损失。已有研究表明，廉价的合成噪声可补偿凹面化造成的空间细节和速度感知损失，但其在恢复因时间分辨率降低而丢失的运动线索方面的潜力尚未被探索。本文证明此类噪声本身可恢复这些线索：平移 Gabor 核可简化为相移，而调制核相位可产生流畅运动的感知，无需完全重新渲染噪声。我们推导了一种方法，给定屏幕上的角速度和时间渲染率，选择空间频率噪声带，使相移在不引入自身运动混叠的情况下，从感知上掩盖抖动。用户实验表明，我们的技术大幅扩大了在降低时间分辨率下运动仍保持流畅的角速度范围，且不会引起图像质量的明显下降。
英文摘要
Low framerates during rendering arise when frame time exceeds the rendering budget, or can be introduced deliberately to save computation, for example in foveated rendering, where the periphery can be rendered at a reduced spatial and temporal resolution. However, low frame rates also cause non-smooth motion, or judder, degrading perceived image quality. Judder manifests as aliasing in the spatiotemporal frequency domain; temporal filtering, such as blurring, can suppress it, but at an additional computational cost and incur a larger loss of detail. Prior work has shown that inexpensive synthesized noise can compensate for the loss of spatial detail and velocity perception caused by foveation, but its potential for restoring motion cues lost to reduced temporal resolution has not yet been explored. We show that such noise can itself restore these cues: translating a Gabor kernel reduces to a phase shift, and modulating a kernel phase creates a perception of smooth motion without having to fully rerender the noise. We derive a method that, given the on-screen angular velocity and the temporal rendering rate, selects a spatial frequency noise band such that phase shifts perceptually mask judder without introducing motion aliasing of their own. User experiments show that our technique substantially expands the range of angular velocities over which motion at reduced temporal resolution remains smooth, without objectionable degradation of image quality.
发表机构
- University of Minnesota（明尼苏达大学）
- Università della Svizzera italiana（瑞士意大利语联邦大学）
机构由 AI 辅助整理，请以论文原文为准。
