Occluded Imaging with Time-of-Flight Sensors
Occluded Imaging with Time-of-Flight Sensors
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DOI：
10.1145/2836164
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发表时间：
2016-05-01
影响因子：
6.2
通讯作者：
Raskar, Ramesh
中科院分区：
文献类型：
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作者：
Kadambi, Achuta;Zhao, Hang;Raskar, Ramesh
我们探讨了基于相位的飞行时间（TOF）距离相机是否可以用于观察角落和散射扩散器。通过将TOF测量与阵列信号处理理论联系起来，我们得出结论，性能取决于两个主要因素：相机调制频率和墙的镜面瓣宽度（“亮度”）。对于纯朗伯壁，商品TOF传感器在目标之间实现了米数量级的分辨率。对于看似扩散的墙壁，如海报，分辨率急剧降低，到10厘米的数量级。特别是，我们发现反射率和分辨率之间的关系是非线性的——轻微的亮度可以导致分辨率的显著提高。由于许多现实场景表现出轻微的光泽，我们相信现成的TOF相机可以看到角落。
We explore the question of whether phase-based time-of-flight (TOF) range cameras can be used for looking around corners and through scattering diffusers. By connecting TOF measurements with theory from array signal processing, we conclude that performance depends on two primary factors: camera modulation frequency and the width of the specular lobe ("shininess") of the wall. For purely Lambertian walls, commodity TOF sensors achieve resolution on the order of meters between targets. For seemingly diffuse walls, such as posterboard, the resolution is drastically reduced, to the order of 10cm. In particular, we find that the relationship between reflectance and resolution is nonlinear-a slight amount of shininess can lead to a dramatic improvement in resolution. Since many realistic scenes exhibit a slight amount of shininess, we believe that off-the-shelf TOF cameras can look around corners.