用于闪光图像消噪的改进BM3D方法  

Improved BM3D method for flash X-ray radiograph denoising

作　　者：危才华[1] 唐志鹏 景越峰[1] 管永红[1] 刘进[1] Wei Caihua;Tang Zhipeng;Jing Yuefeng;Guan Yonghong;Liu Jin(Institute of Fluid Physics,CAEP,Mianyang 621900,China)

机构地区：[1]中国工程物理研究院流体物理研究所,四川绵阳621900

出　　处：《强激光与粒子束》2024年第10期61-68,共8页High Power Laser and Particle Beams

基　　金：冲击波物理与爆轰波物理重点实验室基金项目(JCKY202212005)。

摘　　要：高斯噪声是闪光图像中的主要噪声,将在密度反演等后续处理中被放大,严重影响密度重建及客体边界提取结果,因此,消高斯噪声是闪光图像消噪研究的重点内容。针对闪光照相图像噪声及照相客体轴旋转对称的特点,研究了基于三维块匹配滤波(Block Matching and 3D Filtering,BM3D)的闪光照相图像消噪算法,针对闪光照相图像中难以获得更高质量相似块的缺陷,在不破坏噪声独立性的情况下,通过对含噪退化图像进行旋转与镜像操作,增加了提供相似块的图像来源。同时,通过引入图像块的灰度变换,降低了原有相似性要求中的灰度值要求,提高了形状相似的要求,增加了获得高质量相似块的能力。图像的消噪结果表明,由于相似块的质量得到保证,用于闪光图像消噪的改进BM3D方法取得了更好的消噪效果。Gaussian noise is the main noise in flash X-ray radiographs,which will be magnified in the subsequent density inversion and other processing,and seriously affect the results of density reconstruction and object boundary extraction.Therefore,eliminating Gaussian noise is the key content of flash X-ray radiograph denoising research.According to the characteristics of image noise in flash X-ray radiographs and the rotational symmetry of object axes,this paper studies the denoising algorithm of flash X-ray radiographs based on BM3D(Block Matching and 3D Filtering).To overcome the defect that it is difficult to obtain high-quality similar blocks in flash X-ray radiographs,the image sources for providing similar blocks are increased by rotating and mirroring the noisy degraded images without destroying the noise independence.At the same time,by introducing grayscale transformation of image blocks,the grayscale value requirements in the original similarity requirements are reduced,the shape similarity requirements are improved,and the ability to obtain high-quality similar blocks is increased.Image denoising results show that the improved BM3D method in this paper achieves better denoising effect because the quality of similar blocks is guaranteed.

关 键 词：闪光图像 高斯噪声 BM3D 消噪 

分 类 号：TN919[电子电信—通信与信息系统]