Hong Huanhuan, Liang Jiajia, Deng Liza, Guo Wei, Wang Xiaozhong
Opt Lett. 2023 Aug 1;48(15):3837-3840. doi: 10.1364/OL.495048.
The row scanning mechanism of a rolling shutter camera can be used to infer high-frequency information from a low-frame-rate video. Combining the high intensity of laser speckle and high row-sampling rate of a rolling shutter, extreme detectable vibration frequency limited by rolling shutter camera imaging is experimentally demonstrated. Using a commercially available industrial camera at a frame rate of 70 fps, a vibration signal with a frequency of 14.285 kHz is extracted that corresponds to an inter-row sampling period of 35 µs and a sampling frequency of 28.57 kHz. Connected component and centroid alignment algorithms are used to extract the inter-row vibration displacement. The parameters that limit the highest and lowest detectable frequencies are discussed.
卷帘快门相机的行扫描机制可用于从低帧率视频中推断高频信息。结合激光散斑的高强度和卷帘快门的高行采样率，通过实验证明了卷帘快门相机成像所限制的极端可检测振动频率。使用市售工业相机，以70帧/秒的帧率提取了频率为14.285千赫兹的振动信号，该信号对应于35微秒的行间采样周期和28.57千赫兹的采样频率。使用连通分量和质心对齐算法来提取行间振动位移。讨论了限制最高和最低可检测频率的参数。
