Study on fusion method of X-ray images of ancient bronze mirrors based on lifting wavelet

In order to synthesize X-ray image information of bronze mirrors into the same image, source image was decomposed by lifting wavelet. Different fusion rules were used for image fusion at low and high frequencies respectively. The method of combining regional energy with regional variance was used in low frequency. Spatial frequency combined with the method of neighborhood pixels to standardize intermediate pixels was used in high frequency. Finally, the target image was obtained by lifting inverse wavelet transform. Theoretical analysis and experimental verification were carried out. Information entropy, average gradient and standard deviation of the fused image were obtained. The results show that, in three groups of experiments, compared with the other three algorithms, information entropy of the proposed algorithm in this paper is increased by 5.76% on average. Average gradient is increased by 28.70%. Standard deviation is increased by 7.70% on average. The algorithm effectively preserves the information of the source image. Edge transmission effect is better. This result is helpful for the fusion of X-ray images of bronze mirrors.