结合高频强调滤波与Lee滤波的全息图再现像降噪方法

A method of reconstructing image denoising method with high frequency emphasis filtering and Lee filtering

数字全息图像的获取过程中,由于激光光源的高度相干性而引起的散斑噪声不可避免。散斑噪声的存在成为影响全息图像质量的重要因素,而单一的数字图像处理方法无法直接有效地减少全息再现图像中的散斑噪声。针对以上问题,本文提出了一种大幅减少散斑噪声的新算法。该算法先使用多高频强调滤波的方法对全息图像进行初步降噪,再对降噪后的数字全息再现图像进行Lee滤波处理。仿真结果表明,本文提出的方法大幅度提高了全息再现像的峰值信噪比,散斑指数和对比度也有所改善。降噪处理后的图像视觉效果良好,与不含噪声的原始图像差异较小。以上结果均表明本文算法能够有效改善数字全息再现像的质量。

In the process of acquiring digital holographic image,due to the high coherence of the light source,the speckle noise is inevitable,which is the important factor affecting the image quality. This paper presents a new method to solve the problem that the single digital image processing method can not effectively remove the speckle noise in the reconstructed image directly. First,using the method of high frequency emphasis filtering to make a preliminary image denoising,and then processing the reconstructed image with the Lee filtering method. The simulation results show that the method proposed in this paper can greatly improve the peak signal to noise ratio of the reconstructed image. At the same time,the speckle index and image contrast are improved. After the image denoising,the visual effect is good,and the difference of the original image with noise is small. These results show that the algorithm can effectively improve the quality of digital holographic reconstruction image.