Measurement of abdominal shape by sampling moire method and extension to video processing

Y. Mochizuki; N. Tagawa; K. Okubo

doi:10.1117/12.2566901

1 June 2020 Measurement of abdominal shape by sampling moire method and extension to video processing

Y. Mochizuki, N. Tagawa, K. Okubo

Proceedings Volume 11515, International Workshop on Advanced Imaging Technology (IWAIT) 2020; 115151Y (2020) https://doi.org/10.1117/12.2566901
Event: International Workshop on Advanced Imaging Technologies 2020 (IWAIT 2020), 2020, Yogyakarta, Indonesia

Abstract

To detect abnormal breathing in a patient, it is necessary to take an image of the patient's chest and abdomen and analyze their movement. The ultimate goal of this study is to develop a system that determines the triage level by measuring the 3D deformation of the patient's abdomen and chest in real time and analyzing the results. This time, considering that there is little texture information in the abdomen and chest, we focused on Moire analysis that is effective for 3D measurement in such cases. In this research, dynamic 3D measurement using image sequences is necessary. Therefore, the sampling Moire method, which is often used in recent years because of high calculation efficiency, was adopted. In the Moire analysis, it is necessary to determine the absolute fringe order of the Moire fringes by another method. In static measurement, the distance to the reference fringe can be measured in advance, but it is difficult in dynamic measurement. Therefore, we propose a method of projecting spot light together with slit light for Moire analysis and using the dynamic stereo method together. It can be adaptively adjusted for each frame so that the spot light irradiation position on the object is on the reference stripe. The depth distance to that position can be calculated using the dynamic stereo method, so 3D measurements can be performed independently for each frame. The effectiveness and accuracy of this method were confirmed through experiments on real image sequences.

Citation Download Citation

Y. Mochizuki, N. Tagawa, and K. Okubo "Measurement of abdominal shape by sampling moire method and extension to video processing", Proc. SPIE 11515, International Workshop on Advanced Imaging Technology (IWAIT) 2020, 115151Y (1 June 2020); https://doi.org/10.1117/12.2566901

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KEYWORDS

Moire patterns

3D metrology

Abdomen

Cameras

3D image processing

Video processing

Fringe analysis

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