光学技术, 2019, 45 (5): 612, 网络出版: 2020-01-07
基于相机扫描的太赫兹光场成像预处理方法
Terahertz optical field imaging preprocessing method based on camera scanning
太赫兹光场成像 图像处理 图像拼接 Harris算法 Terahertz light field imaging Image processing the image mosaic Harris algorithm
摘要
太赫兹光场成像是一种太赫兹波段内的计算成像手段。在太赫兹相机扫描成像的基础上进行了图像预处理和光场计算。针对太赫兹相机受器件性能限制导致输出图像存在噪声大、分辨率低和视场小等问题, 对基于相机扫描的太赫兹光场成像进行了预处理, 通过控制二维平移台, 采集到一系列存在特定视角差别的目标图像;采取高通滤波方式对图像进行处理, 得到噪声小、锐化程度好的图像;在不降低图像分辨率的基础上利用Harris特征图像拼接算法计算得到较大视场的图像。通过上述方法, 有效地提高了光场成像质量, 为实现太赫兹光场成像三维重构奠定了基础。
Abstract
Terahertz light field imaging is a computational imaging method in terahertz band. Image preprocessing and light field calculation are performed based on the scanning imaging of terahertz camera (Microxcam-384i THz). Aiming at the problems of high noise, low resolution and small field of view in the output image of THZ camera due to the limitation of device performance, preprocessing of terahertz light field imaging based on camera scanning. Firstly, a series of target images with specific visual Angle differences are acquired by controlling the two-dimensional translation platform, the image is processed by high-pass filtering method and the image with good noise sharpening degree is obtained. Finally, Harris feature image stitching algorithm is used to calculate images with larger field of view without reducing the image resolution. In short, through the above method, the optical field imaging quality is effectively improved, which lays a foundation for realizing the three-dimensional reconstruction of terahertz light field imaging.
耿丽华, 何敬锁, 张宏飞, 苏波, 张存林. 基于相机扫描的太赫兹光场成像预处理方法[J]. 光学技术, 2019, 45(5): 612. GENG Lihua, HE Jingsuo, ZHANG Hongfei, SU Bo, ZHANG Cunlin. Terahertz optical field imaging preprocessing method based on camera scanning[J]. Optical Technique, 2019, 45(5): 612.