TITLE:
Research on the Improvement Method for Default Image Display Effect of Dual-Energy X-Ray Security Inspection Equipment Based on Improved NL-Means Filter
AUTHORS:
Yanli Zha, Weiwu Kong
KEYWORDS:
NL-Means Filter, Acceleration, Dual-Energy X-Ray, Security Inspection
JOURNAL NAME:
Journal of Computer and Communications,
Vol.13 No.11,
November
5,
2025
ABSTRACT: Aiming at the shortcomings of uneven image color and prominent noise in the default image display effect of existing dual-energy X-ray security inspection equipment, the corresponding improvement method is studied. Firstly, the improved Non-Local Means filter (hereinafter referred to as improved NL-Means) is used to perform adaptive smoothing on the original high and low-energy images to obtain the corresponding material characteristic images. Furthermore, the improved NL-Means filter is used again to smooth the material characteristic images, so as to improve the phenomena of uneven image color and prominent noise points. However, this filtering method has a serious problem of low real-time efficiency, making it difficult to apply in engineering. This paper studies three acceleration methods. The first one is to selectively implement the improved NL-Means filter from the perspective of the image itself; the second one is to reasonably reduce the number of structural operations based on the principle and structure of the algorithm; the third one is to convert the floating-point exponential operation into a look-up table operation from the perspective of engineering practice. The experimental results show that the proposed method effectively improves the default image display effect of the security inspection equipment, which plays a very positive role not only in the security inspectors’ interpretation of images but also in improving the performance indicators of the equipment.