A comparison of filtering techniques on denoising terahertz coaxial digital holography image

Shan-shan Cui; Qi Li

doi:10.1117/12.2246666

25 October 2016 A comparison of filtering techniques on denoising terahertz coaxial digital holography image

Shan-shan Cui, Qi Li

Proceedings Volume 10157, Infrared Technology and Applications, and Robot Sensing and Advanced Control; 101571R (2016) https://doi.org/10.1117/12.2246666
Event: International Symposium on Optoelectronic Technology and Application 2016, 2016, Beijing, China

Abstract

In the process of recording terahertz digital hologram, the hologram is easy to be contaminated by speckle noise, which leads to lower resolution in imaging system and affects the reconstruction results seriously. Thus, the study of filtering algorithms applicable for de-speckling terahertz digital holography image has important practical values. In this paper, non-local means filtering and guided bilateral filtering were brought to process the real image reconstructed from continuous-wave terahertz coaxial digital hologram. For comparison, median filtering, bilateral filtering, and robust bilateral filtering, were introduced as conventional methods to denoise the real image. Then, all the denoising results were evaluated. The comparison indicates that the guided bilateral filter manifests the optimal denoising effect for the terahertz digital holography image, both significantly suppressing speckle noise, and effectively preserving the useful information on the reconstructed image.

Citation Download Citation

Shan-shan Cui and Qi Li "A comparison of filtering techniques on denoising terahertz coaxial digital holography image", Proc. SPIE 10157, Infrared Technology and Applications, and Robot Sensing and Advanced Control, 101571R (25 October 2016); https://doi.org/10.1117/12.2246666

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