双能X射线高动态范围安检图像压缩算法

为使拥有高动态范围的双能X射线安检图像在普通显示器上显示时不丢失细节,提出了一种基于多尺度局部保边(local edge-preserving,LEP)滤波的自适应色调映射算法.该算法对原始图像进行多尺度LEP滤波,得到1个基础层和3个细节层.随后对基础层进行对数自适应色调映射,并对3个细节层进行Sigmoid函数自适...

Compression Algorithm of Dual X-ray Security Inspection Images with High Dynamic Range

In order to display dual X-ray images with high dynamic range from a security inspection system without losing details， a self-adaptive tone mapping algorithm based on the multiscale local edge-preserving filter was proposed. The input image was decomposed into one base layer and three detail layers by using the LEP filter. An adaptive logarithmic transformation was carried out in the base layer to compress the dynamic range and the three detail layers were enhanced by an adaptive Sigmoid function. Every detail layer image was fused with the base layer image and histogram equalization was taken considering noise and increasing contrast. The proposed algorithm was used to dispose the high and low energy X-ray images at the same time and both of them were combined according to their own merits， which could get a low dynamic range dual X-ray image with rich details. Experimental results showed that the proposed algorithm highly improves images information entropy， contrast improvement index and peak signal to noise ratio， which indicates that the image quality is successfully optimized.