一个具有广泛信号强度范围的六拍iToF成像仪,使用线性-对数响应的线性化
Tomohiro Okuyama1, Haruya Sugimura2, Gabriel Alcade2
1Graduate School of Medical Photonics, Shizuoka University, Hamamatsu 432-8011, Japan.
Sensors (Basel, Switzerland)
|December 31, 2025
概括
本研究引入了飞行时间 (ToF) 传感器的三区域线性化技术,在广泛的光强度范围内显著提高了精度. 这种方法提高了在具有不同反射率的挑战性环境中的深度成像性能.
科学领域:
- 光电学是指光电子产品.
- 计算机视觉 计算机视觉
- 传感器技术 传感器技术
背景情况:
- 飞行时间 (ToF) 图像传感器需要广泛的动态范围来捕捉不同的光强度,从扩散到反射信号.
- 间接ToF (iToF) 传感器中现有的线性-对数 (Lin-Log) 像素响应在这个广泛的范围内保持线性面临挑战.
研究的目的:
- 开发和验证用于短脉冲多点击间接ToF传感器的信号强度范围扩展技术.
- 为了使Lin-Log像素响应线性化,在各种照明条件下提高精度和稳定性.
主要方法:
- 导出每个像素的两个区域 (2R) 和三个区域 (3R) 模型,涵盖线性,过渡和对数响应模式.
- 应用这些模型从iToF传感器数据中恢复近线性信号.
- 使用具有不同目标距离和反射率的六拍iToF成像器进行实验验证.
主要成果:
- 三区域 (3R) 线性化方法与两区域方法相比,在过渡点附近显著改善了线性.
- 像素智能的3R线性化产生了准确和稳定的深度成像结果,减少了平均误差和像素智能的偏差.
- 范围测量在1.8至13.0米的距离上实现了厘米级分辨率,将线性误差限制从±6.7%FS降至±1.5%FS.
结论:
- 林-Log像素与像素智能的三区域线性化相结合,可以在扩展的动态范围内进行强大的ToF传感.
- 这种技术适用于具有较大反射率变化的实际环境,提高了深度成像应用的可靠性.
- 进一步的改进可以解决归因于微小脉冲宽度不匹配的剩余周期性偏差.
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