{"slug": "lq-rppg-a-label-quantized-coarse-to-fine-learning-framework-for-remote", "title": "LQ-rPPG: A Label-Quantized Coarse-to-Fine Learning Framework for Remote Physiological Measurement", "summary": "Researchers have developed LQ-rPPG, a label-quantized coarse-to-fine learning framework that improves remote photoplethysmography (rPPG) estimation from facial videos by reducing noise in training labels. The framework uses a label quantization module to convert noisy contact-based PPG signals into multi-bit pseudo labels, enabling a coarse-to-fine model to learn more robust and generalizable physiological measurements. In benchmark tests, LQ-rPPG achieved strong performance across datasets while reducing parameters by 88% and increasing throughput by 191%, addressing a key limitation in existing deep learning-based rPPG methods.", "body_md": "arXiv:2605.23174v1 Announce Type: new\nAbstract: Remote photoplethysmography (rPPG) enables non-contact measurement of physiological signals from facial videos, offering strong potential for remote healthcare and daily health monitoring. Driven by this potential, various deep learning-based rPPG methods have been proposed to improve rPPG estimation. However, previous deep learning-based rPPG methods have paid little attention to the quality of training labels and their impact on model learning. Contact-based PPG signals used as training labels often contain noise and variability caused by motion artifacts, inconsistent sensor contact, and morphological distortions. Such label inconsistency can lead models to overfit to the label noise and variability and consequently degrade generalization performance. To address this issue, we propose LQ-rPPG, a label-quantized coarse-to-fine learning framework for robust rPPG estimation. LQ-rPPG consists of a label quantization module and a coarse-to-fine rPPG estimation model. The label quantization module transforms continuous PPG signals into multi-bit quantized pseudo labels with reduced noise and variability. The coarse-to-fine estimation model progressively refines rPPG signals under hierarchical supervision guided by the multi-bit pseudo labels. This design alleviates overfitting to label-specific variations and enables the model to learn structured and consistent representations. As a result, LQ-rPPG achieves robust and generalizable rPPG estimation even under challenging conditions. Experiments on multiple benchmark datasets demonstrate that LQ-rPPG achieves strong performance in both intra- and cross-dataset evaluations, while reducing parameters and multiply-accumulate operations by 88% and 29%, respectively, and increasing throughput by 191%. The code is available at https://github.com/Anonymous-repo-code/LQ-rPPG.", "url": "https://wpnews.pro/news/lq-rppg-a-label-quantized-coarse-to-fine-learning-framework-for-remote", "canonical_source": "https://arxiv.org/abs/2605.23174", "published_at": "2026-05-25 04:00:00+00:00", "updated_at": "2026-05-25 15:21:08.366403+00:00", "lang": "en", "topics": ["machine-learning", "computer-vision", "neural-networks", "artificial-intelligence", "ai-research"], "entities": [], "alternates": {"html": "https://wpnews.pro/news/lq-rppg-a-label-quantized-coarse-to-fine-learning-framework-for-remote", "markdown": "https://wpnews.pro/news/lq-rppg-a-label-quantized-coarse-to-fine-learning-framework-for-remote.md", "text": "https://wpnews.pro/news/lq-rppg-a-label-quantized-coarse-to-fine-learning-framework-for-remote.txt", "jsonld": "https://wpnews.pro/news/lq-rppg-a-label-quantized-coarse-to-fine-learning-framework-for-remote.jsonld"}}