An Improved Enhancement Algorithm Based on Gray-level Grouping for X-ray Hand Luggage Images
Ping Han, Zexu Liu, HE Wei-kun · IC3T '12 Proceedings of the 2012 International Conference on Convergence Computer Technology · 2012
Aiming at the poor definition features of low-contrast x-ray hand luggage images, an improved enhancement scheme based on GLG (gray-level grouping) is proposed in this paper. First, low and high energy images are fused with discrete wavelet transform, then GLG and selective GLG methods are applied to the low-frequency and high-frequency images respectively, which are obtained by frequency-division processing. Experimental results show that the proposed algorithm can improve image quality more effectively compared with the GLG and histogram equalization.