一种新颖的中子辐照图像压缩算法

分析了中子辐照图像的持点，提出一种适合于数字中子照相系统的图像压缩算法。将小波和方向滤波器组（DFB）结合，得到非冗余的图像变换WDFB；通过WDFB系数的重新组合，提出一种新颖的图像压缩方案，该方案类似于无表零树编码（LZC）算法；为了充分利用WDFB变换对二维分段光滑函数的良好表达能力，该算法引入线性索引技术并采用不同于LZC算法的零树表达策略。实验结果表明，该算法用于中子辐照图像压缩是有效的，在相同压缩比下，其主观视觉质量和峰值信噪比（PSNR）都明显优于LZC算法，和多级树集合分裂编码（SPIHT）算法相比，具有相当的压缩性能但更易于硬件实现。

A Novel Algorithm for Neutron Radiography Image Compression

An image compression algorithm,which is suit for digital neutron radiography system,is proposed.By integrating wavelet with directional filter banks(DFB),a non-redundant image tranform that is named WDFB is realized.By recombining the coefficients of WDFB,a novel image compression scheme is proposed;the scheme is similar to the listless zerotree coding(LZC).In order to utilize the good performance of WDFB in estimating 2-D piecewise smooth functions,this algorithm introduces the linear indexing technique and adopts zerotree representation strategy which is different from LZC.The experiments demonstrate that the proposed algorithm is efficient in coding neutron radiography images.At same compression rate,the new algorithm outperforms LZC both visually and in terms of the PSNR values.The simulation results also show that the proposed algorithm is competitive to SPIHT algorithm and outperforms SPIHT in terms of hardware implementation.