Laser Speckle Contrast Imaging Based on a Mobile Phone Camera
Laser Speckle Contrast Imaging Based on a Mobile Phone Camera
复制标题
基于手机摄像头的激光散斑对比成像
DOI：
10.1109/access.2021.3076799
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发表时间：
2021-01-01
期刊：
影响因子：
3.9
通讯作者：
Liu, Wei
中科院分区：
文献类型：
--
作者：
Kong, Ping;Xu, Hao;Liu, Wei
激光散斑对比成像（Laser speckle contrast imaging， LSCI）技术是一种血流监测技术，具有广阔的应用前景，已成为一个有吸引力的研究课题。近年来，随着智能手机的普及，移动医疗逐渐走进了普通民众的生活。本文采用智能手机上的摄像系统取代传统激光散斑灌注成像仪上的工业摄像头，提高了血流成像质量。由于原始散斑图像的静态和动态区域的差异可以反映在小波分解的子带中，因此可以在保留速度信息的情况下进行图像处理。在此基础上，提出了一种基于手机摄像头的散斑对比度分析方法；该方法首先对原始散斑图像进行二维离散小波变换和图像插值处理，然后进行形态学处理。该方法提高了散斑图像的对比度分辨率，提高了图像的可视化效果。结果表明，该方法处理后的血液灌注图像的对比噪声比（CNR）可提高128%。
Laser speckle contrast imaging (LSCI) technology, a type of blood flow monitoring technology, has broad application prospects and has become an attractive subject of research. In recent years, with the popularization of smart phones, mobile healthcare has gradually entered the lives of the general public. In this paper, a camera system used on smart phones was employed to replace the industrial camera on the traditional laser speckle perfusion imager, and the quality of blood flow imaging was improved. Since the difference between the static and dynamic region of the raw speckle image can be reflected in the subbands of wavelet decomposition, the image processing can be performed while retaining the velocity information. Further, a speckle contrast analysis method based on mobile phone cameras is proposed; the method first processes the raw speckle images with a two-dimensional discrete wavelet transform and image interpolation and then performs a morphological operation. This method improved the speckle image contrast resolution and improved the visualization of images. The results showed that the contrast-to-noise ratio (CNR) of the blood perfusion image processed by the new method can be increased by up to 128%.