发表机构
Morgan State University（摩根州立大学）
机构由 AI 辅助整理，请以论文原文为准。AI 中文总结
该研究针对异构观测条件，在655条记录上评估PPG到rPPG的属性特异性可恢复性，发现生理属性的可恢复性具有差异，总体合理性不代表单个记录的保存情况。
AI 中文摘要
相机衍生的远程光体积描记术（rPPG）通常通过端点精度进行验证，但端点性能无法确定源接触式光体积描记术（PPG）的其他生理属性是否在每次记录中都保持不变。我们使用CHROM作为固定的相机-rPPG观测通路，在多域移动视频生理数据集的655条记录上评估了属性特异性PPG到rPPG的可恢复性。该通路重现了已发表的CHROM相关机制，心率平均绝对误差（MAE）为15.26次/分钟，皮尔逊相关系数为0.0801。匹配-打乱验证显示出适度的特定记录自相关对应关系，而频谱和复发率指标几乎没有匹配区分度。最大李雅普诺夫指数显示基本不存在特定记录的PPG到rPPG对应关系，相关系数为0.0231，置换p值为0.5584，尽管存在总体水平的重叠。在调整光照和运动后，端点差异表现出与Fitzpatrick相关的异质性，包括Fitzpatrick VI型与III型的对比为9.32次/分钟，而动态差异未显示出相应的梯度。聚合RGB信噪比并未实质性解释端点对比。在受试者留一分析中，与仅rPPG-HR校准相比，添加运动和光照 consistently降低了线性、岭回归和随机森林学习器的MAE，降低幅度高达13.32%。这些发现表明，可恢复性具有属性特异性：生理属性在特定记录的保存程度和对观测条件的依赖性方面存在差异，总体水平的合理性无法确定单个记录的保存情况。
英文摘要
Camera-derived remote photoplethysmography (rPPG) is commonly validated through endpoint accuracy, but endpoint performance does not establish whether other physiological properties of source contact photoplethysmography (PPG) remain preserved recording by recording. We evaluated property-specific PPG-to-rPPG recoverability on 655 recordings from the Multi-Domain Mobile Video Physiology Dataset using CHROM as a fixed camera-rPPG observation pathway. The pathway reproduced the published CHROM correlation regime, with heart-rate MAE of 15.26 bpm and Pearson correlation of 0.0801. Matched-versus-shuffled validation revealed modest recording-specific autocorrelation correspondence, while spectral and recurrence-rate measures showed little matched discrimination. Maximal Lyapunov exponents showed essentially no recording-specific PPG-to-rPPG correspondence, with correlation of 0.0231 and permutation p-value of 0.5584, despite population-level overlap. Endpoint discrepancy exhibited Fitzpatrick-associated heterogeneity after adjustment for lighting and motion, including a Fitzpatrick VI versus III contrast of 9.32 bpm, while dynamical discrepancy showed no corresponding gradient. Aggregate RGB signal-to-noise ratio did not materially account for the endpoint contrast. In subject-held-out analysis, adding motion and lighting consistently reduced MAE across linear, ridge, and random-forest learners relative to rPPG-HR-only calibration, with reductions up to 13.32 percent. These findings show that recoverability is property-specific: physiological properties differ in recording-specific preservation and dependence on observation conditions, and population-level plausibility does not establish preservation of individual recordings.
