Study on light field imaging technology and its prospects in terahertz field

Compared with traditional imaging, optical field imaging records the four-dimensional position information and direction information of the object. It has two degrees of freedom more than the two-dimensional traditional image, so it has more abundant image information in the later processing. According to Levoy's theory of light field rendering, light field can be parameterized by two parallel planes. Compared with visible light, terahertz has the characteristics of long wavelength, strong penetration and low energy. Therefore, terahertz optical field imaging technology will have the advantages of wide dynamic range and deep field. This paper summarizes the acquisition methods of light field and describes the post-processing methods of light field, including digital refocusing, super-resolution, depth estimation, synthetic aperture imaging and microscopic imaging technology. Finally, the application of terahertz optical field imaging and the possible problems are summarized.