实测人眼可视分辨率上限，为显示技术提供关键参考。
Resolution limit of the eye: how many pixels can we see?
- 用可连续调节分辨率的滑动屏实验，突破以往研究限制。
- 中央视野下黑白视觉最高达94 ppd，色觉分辨率更低，红绿89 ppd，黄紫53 ppd。
- 色觉分辨率下降比明暗对比明显，适合显示与图像编码研发者参考。
随着移动端、AR 和 VR 显示器分辨率持续提升，明确进一步优化是否具有感知意义至关重要。本文通过自研滑动显示实验装置，实现分辨率的连续调控，克服了以往研究中控制不足的缺陷。测量了中央视野（foveal vision）及10°和20°偏离中心时的明度（achromatic）与色度（chromatic，红-绿、黄-紫）分辨极限。结果表明：中央视野明度分辨极限可达94像素/度（ppd），红-绿模式为89 ppd，黄-紫模式为53 ppd；且色觉分辨率在偏离中心时下降更显著。该结果为显示、成像、渲染与视频编码技术提供了关键基准。
原文摘要 · Abstract (English)
As large engineering efforts go towards improving the resolution of mobile, AR and VR displays, it is important to know the maximum resolution at which further improvements bring no noticeable benefit. This limit is often referred to as the "retinal resolution", although the limiting factor may not necessarily be attributed to the retina. To determine the ultimate resolution at which an image appears sharp to our eyes with no perceivable blur, we created an experimental setup with a sliding display, which allows for continuous control of the resolution. The lack of such control was the main limitation of the previous studies. We measure achromatic (black-white) and chromatic (red-green and yellow-violet) resolution limits for foveal vision, and at two eccentricities (10 and 20 deg). Our results demonstrate that the resolution limit is higher than what was previously believed, reaching 94 pixels-per-degree (ppd) for foveal achromatic vision, 89 ppd for red-green patterns, and 53 ppd for yellow-violet patterns. We also observe a much larger drop in the resolution limit for chromatic patterns (red-green and yellow-violet) than for achromatic. Our results set the north star for display development, with implications for future imaging, rendering and video coding technologies.
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