Terahertz digital holography image processing based on MAP algorithm

Guang-Hao Chen; Qi Li

doi:10.1117/12.2180056

13 April 2015 Terahertz digital holography image processing based on MAP algorithm

Guang-Hao Chen, Qi Li

Proceedings Volume 9522, Selected Papers from Conferences of the Photoelectronic Technology Committee of the Chinese Society of Astronautics 2014, Part II; 95221I (2015) https://doi.org/10.1117/12.2180056
Event: Selected Proceedings of the Photoelectronic Technology Committee Conferences held August-October 2014, 2014, China, China

Abstract

Terahertz digital holography combines the terahertz technology and digital holography technology at present, fully exploits the advantages in both of them. Unfortunately, the quality of terahertz digital holography reconstruction images is gravely harmed by speckle noise which hinders the popularization of this technology. In this paper, the maximum a posterior estimation (MAP) filter is harnessed for the restoration of the digital reconstruction images. The filtering results are compared with images filtered by Wiener Filter and conventional frequency-domain filters from both subjective and objective perspectives. As for objective assessment, we adopted speckle index (SPKI) and edge preserving index (EPI) to quantitate the quality of images. In this paper, Canny edge detector is also used to outline the target in original and reconstruction images, which then act as an important role in the evaluation of filter performance. All the analysis indicate that maximum a posterior estimation filtering algorithm performs superiorly compared with the other two competitors in this paper and has enhanced the terahertz digital holography reconstruction images to a certain degree, allowing for a more accurate boundary identification.

Citation Download Citation

Guang-Hao Chen and Qi Li "Terahertz digital holography image processing based on MAP algorithm", Proc. SPIE 9522, Selected Papers from Conferences of the Photoelectronic Technology Committee of the Chinese Society of Astronautics 2014, Part II, 95221I (13 April 2015); https://doi.org/10.1117/12.2180056

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KEYWORDS

Image filtering

Electronic filtering

Linear filtering

3D image reconstruction

Digital holography

Digital filtering

Optical filters

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