A single‐camera telecentric imaging stereo‐digital image correlation system and its application to carotid pulse signal detection

IF 2.1 3区材料科学 Q2 Engineering

Strain Pub Date : 2023-09-27 DOI:10.1111/str.12466

Chao Chen, Xiaojun Tang, Bing Pan

引用次数: 0

Abstract

Abstract Carotid pulse signal (CPS) is one of the most important biomarkers for evaluating cardiovascular risk. To realize easy‐to‐operate and accurate CPS detection, a single‐camera telecentric imaging stereo‐digital image correlation (stereo‐DIC) system is established. The system uses a specially designed colour separation device and a single colour camera attached with a telecentric lens to record images of blue and red colours from different optical paths. By processing the recorded two sub‐channel colour images using regular stereo‐DIC algorithm, full‐field 3D displacements of the skin on the neck directly over the carotid artery are obtained. The maximum fluctuations in the out‐of‐plane displacement direction are extracted as CPS, based on which velocity, acceleration and frequency can be further extracted. The performance of the established system was demonstrated by detecting the pulse signal of a volunteer before and after exercise.

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单相机远心成像立体数字图像相关系统及其在颈动脉脉冲信号检测中的应用

颈动脉脉冲信号(CPS)是评价心血管危险最重要的生物标志物之一。为了实现易于操作和精确的CPS检测，建立了一个单相机远心成像立体数字图像相关(stereo - DIC)系统。该系统使用一个特别设计的分色装置和一个带有远心镜头的单色相机，记录来自不同光路的蓝色和红色图像。通过使用常规立体声DIC算法处理记录的两个子通道彩色图像，可以获得颈动脉上方颈部皮肤的全视野3D位移。将面外位移方向的最大波动提取为CPS，以此进一步提取速度、加速度和频率。通过检测志愿者运动前后的脉搏信号，验证了所建立系统的性能。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Strain MATERIALS SCIENCE, CHARACTERIZATION & TESTING-

CiteScore

4.50

自引率

4.80%

发文量

审稿时长

2.3 months

期刊介绍： Strain is an international journal that contains contributions from leading-edge research on the measurement of the mechanical behaviour of structures and systems. Strain only accepts contributions with sufficient novelty in the design, implementation, and/or validation of experimental methodologies to characterize materials, structures, and systems; i.e. contributions that are limited to the application of established methodologies are outside of the scope of the journal. The journal includes papers from all engineering disciplines that deal with material behaviour and degradation under load, structural design and measurement techniques. Although the thrust of the journal is experimental, numerical simulations and validation are included in the coverage. Strain welcomes papers that deal with novel work in the following areas: experimental techniques non-destructive evaluation techniques numerical analysis, simulation and validation residual stress measurement techniques design of composite structures and components impact behaviour of materials and structures signal and image processing transducer and sensor design structural health monitoring biomechanics extreme environment micro- and nano-scale testing method.