Novel Photometric Stereo Based Pulmonary Function Testing
Novel Photometric Stereo Based Pulmonary Function Testing
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DOI：
10.15221/12.091
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发表时间：
2012-10
期刊：
影响因子：
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通讯作者：
Jahanzeb Ahmad;Jiuai Sun;Lyndon N. Smith;Melvyn L. Smith;John Henderson;Anirban Majumdar
中科院分区：
文献类型：
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作者：
Jahanzeb Ahmad;Jiuai Sun;Lyndon N. Smith;Melvyn L. Smith;John Henderson;Anirban Majumdar
一种基于光度立体的独特而新颖的非接触式方法已经被开发用于执行肺功能测试。该系统基于两个数码相机和八个光源。一个摄像机从前面观察主体，第二个从后面观察主体，而主体穿着紧身白色T恤站在钻机中间。不需要在装备的两侧之间进行配准，并且仅需要一次光源方向校准。该系统可以使用普通桌面系统以每秒110帧（fps）的速度捕获140万像素的图像，并离线处理。通过估计从光度立体计算的表面梯度的变化，观察胸和腹壁运动随时间的变化。观察到光度立体和肺活量计数据产生的体积之间具有非常高的相关性（0.98）。
A Photometric stereo based unique and novel non-contact method has been developed to perform pulmonary functional testing. This system is based on two digital cameras and eight light sources. One camera observes the subject from the front and second from the back while subject is standing in the middle of rig wearing a tight white t-shirt. Registration between both sides of the rig is not required and light source direction calibration is only required once. The system can capture images of 1.4 Mega pixels at 110 frames per second (fps) using an ordinary desktop system and process it offline. Chest and abdomen wall motion is observed over time by estimating change in surface gradient calculated from Photometric Stereo. Very high (0.98) correlation between resulting volume from Photometric Stereo and Spirometer data is observed.