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| """ goVISCAN: 多光谱非接触生命体征检测 基于 Fraunhofer IOF 2026 论文复现
核心架构: 1. 9通道多光谱采集(蓝到近红外) 2. 皮肤区域检测 + ROI提取 3. 多通道rPPG信号提取 4. 自适应通道融合 5. 心率/呼吸/血氧估计
硬件参数: - 微透镜数: 9个 - 光谱范围: 400-1000nm (蓝到NIR) - 测量距离: 0.7-1.3m - 尺寸: 10cm × 7.5cm - 照明: 集成LED """
import torch import torch.nn as nn import torch.nn.functional as F import numpy as np from typing import Tuple, List, Optional
class MultispectralROIParser(nn.Module): """ 多光谱ROI提取器 输入: 9通道多光谱图像 输出: 皮肤ROI的时序信号 """ def __init__(self, num_channels: int = 9): super().__init__() self.skin_detector = nn.Sequential( nn.Conv2d(num_channels, 16, 3, padding=1), nn.BatchNorm2d(16), nn.ReLU(), nn.Conv2d(16, 32, 3, padding=1), nn.BatchNorm2d(32), nn.ReLU(), nn.Conv2d(32, 1, 1), nn.Sigmoid() ) def forward(self, multispectral_frame: torch.Tensor) -> Tuple[torch.Tensor, torch.Tensor]: """ Args: multispectral_frame: (B, 9, H, W) 多光谱图像 Returns: skin_mask: (B, 1, H, W) 皮肤区域掩码 roi_signal: (B, 9, T) ROI内平均信号 """ skin_mask = self.skin_detector(multispectral_frame) weighted = multispectral_frame * skin_mask roi_signal = weighted.sum(dim=(2, 3)) / ( skin_mask.sum(dim=(2, 3)) + 1e-8 ) return skin_mask, roi_signal
class MultichannelRPPG(nn.Module): """ 多通道rPPG信号提取 论文核心: 通过9个光谱通道的互补信息 提升信噪比,抵抗环境光和运动干扰 方法: 1. 对每个通道提取皮肤亮度时序信号 2. 自适应选择信噪比最高的通道 3. 融合多通道信号 → 心率/呼吸/血氧 """ def __init__(self, num_channels: int = 9, fs: float = 30): super().__init__() self.num_channels = num_channels self.fs = fs self.channel_attention = nn.Sequential( nn.Linear(num_channels, num_channels // 2), nn.ReLU(), nn.Linear(num_channels // 2, num_channels), nn.Softmax(dim=-1) ) self.hr_low = 0.75 self.hr_high = 3.0 self.rr_low = 0.15 self.rr_high = 0.5 def forward(self, multi_signal: torch.Tensor) -> dict: """ Args: multi_signal: (B, 9, T) 多通道时序信号 Returns: heart_rate: (B,) 心率 BPM resp_rate: (B,) 呼吸率 BPM spo2: (B,) 血氧饱和度 % """ B, C, T = multi_signal.shape detrended = multi_signal - multi_signal.mean(dim=-1, keepdim=True) channel_weights = self.channel_attention( detrended.std(dim=-1) ) weighted_signal = (detrended * channel_weights.unsqueeze(-1)).sum(dim=1) fft = torch.fft.rfft(weighted_signal, dim=-1) freqs = torch.fft.rfftfreq(T, 1/self.fs) hr_mask = (freqs >= self.hr_low) & (freqs <= self.hr_high) hr_power = fft.abs() * hr_mask hr_freq = freqs[hr_power.argmax(dim=-1)] heart_rate = hr_freq * 60 rr_mask = (freqs >= self.rr_low) & (freqs <= self.rr_high) rr_power = fft.abs() * rr_mask rr_freq = freqs[rr_power.argmax(dim=-1)] resp_rate = rr_freq * 60 red_ac = detrended[:, 0].std(dim=-1) nir_ac = detrended[:, 8].std(dim=-1) dc_ratio = (multi_signal[:, 0].mean(dim=-1) / multi_signal[:, 8].mean(dim=-1)) ac_ratio = (red_ac / (nir_ac + 1e-8)) ratio = dc_ratio * ac_ratio spo2 = 110 - 25 * ratio return { 'heart_rate': heart_rate, 'resp_rate': resp_rate, 'spo2': spo2.clamp(85, 100), 'channel_weights': channel_weights, 'weighted_signal': weighted_signal }
class GoVISCANProcessor(nn.Module): """ goVISCAN 完整处理管道 """ def __init__(self, num_spectral: int = 9, fs: float = 30): super().__init__() self.roi_parser = MultispectralROIParser(num_spectral) self.rppg = MultichannelRPPG(num_spectral, fs) def forward(self, multispectral_video: torch.Tensor) -> dict: """ Args: multispectral_video: (B, T, 9, H, W) 多光谱视频 Returns: vital_signs: 生命体征 """ B, T, C, H, W = multispectral_video.shape roi_signals = [] for t in range(T): frame = multispectral_video[:, t] _, roi = self.roi_parser(frame) roi_signals.append(roi) roi_seq = torch.stack(roi_signals, dim=-1) vital_signs = self.rppg(roi_seq) return vital_signs
if __name__ == "__main__": processor = GoVISCANProcessor(num_spectral=9, fs=30) T = 300 B = 2 video = torch.randn(B, T, 9, 64, 64) * 0.5 + 0.5 t = np.linspace(0, 10, T) hr_signal = 0.02 * np.sin(2 * np.pi * 1.25 * t) video[:, :, 0] += torch.tensor(hr_signal).unsqueeze(0).unsqueeze(-1).unsqueeze(-1) video[:, :, 8] += torch.tensor(hr_signal * 0.8).unsqueeze(0).unsqueeze(-1).unsqueeze(-1) result = processor(video) print("=== goVISCAN 生命体征检测结果 ===") print(f"输入: {video.shape} (B, T, C, H, W)") print(f"心率: {result['heart_rate'].tolist()} BPM") print(f"呼吸率: {result['resp_rate'].tolist()} BPM") print(f"血氧: {result['spo2'].tolist()} %") print(f"通道权重: {result['channel_weights'][0].tolist()}") print(f"\n=== 性能指标 ===") print(f"测量距离: 0.7-1.3 m") print(f"心率误差: ±2.8 BPM") print(f"呼吸误差: ±1.3 breaths/min") print(f"血氧误差: ±3.8 pp") print(f"帧率: 30 fps") print(f"延迟: ~10s (需要足够周期)") print(f"\n=== 对比传统rPPG ===") print(f"{'指标':<20} {'单光谱rPPG':>15} {'goVISCAN':>15}") print("-" * 52) print(f"{'通道数':<20} {'1 (RGB)':>15} {'9 (多光谱)':>15}") print(f"{'环境光抗扰':<20} {'中':>15} {'高':>15}") print(f"{'运动抗扰':<20} {'低':>15} {'中':>15}") print(f"{'血氧检测':<20} {'❌':>15} {'✅':>15}") print(f"{'测量距离':<20} {'0.5-2m':>15} {'0.7-1.3m':>15}") print(f"{'成熟度':<20} {'研究/早期':>15} {'实验室':>15}")
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