Abstract
Fast neutron radiography technology has unique application advantages in the field of non-destructive testing. However, due to the interaction between the gamma rays and the charge-coupled device camera, a large amount of gamma white spots noise is attached to the fast neutron images, which affects the subsequent analysis. In this paper, we propose a simple and effective method to remove gamma white spots noise in fast neutron images. First, the image is down-sampled by the dilated down-sampling method to reduce the influence of noise. Then, the existence of gamma white spots noise is accurately identified by noise detection. Finally, the image is denoised using an improved median filtering method. In order to verify the performance of the proposed method, several commonly used noise reduction methods and the proposed method are used to conduct test experiments on both simulated and fast neutron images, and several image quality evaluation indices are used for quantitative assessment. The results show that the proposed method not only performs well in visual effects but also achieves satisfactory results in evaluation indices.
Subject
General Physics and Astronomy
Reference27 articles.
1. Multi-frame energy-selective imaging system for fast-neutron radiography;Dangendorf;IEEE Trans. Nucl. Sci.,2009
2. Photographic detection of fast neutrons: Application to neutron radiography;Tochilin;Phys. Med. Biol.,1965
3. A. L.
Swift
, “The design of a fast neutron radiography system for non-destructive analysis of thick, dense objects,” Ph.D. thesis, University of Tennessee, 2016.
4. First results of novel magnifying fast neutron radiography based on point-like neutron sources at Shenguang laser facility;Li;Nucl. Instrum. Methods Phys. Res., Sect. A,2022
5. Development of a dual-modality gamma-ray/fast neutron imaging system for air cargo inspection;Park;Appl. Sci.,2022