论文部分内容阅读
为了抑制反射式离轴数字全息再现像中的零级像和散斑噪声对再现像的影响,利用高斯核函数在空域对数字全息图进行低通滤波,再用原数字全息图减去滤波后的低频信息来抑制零级像,采用非局部均值滤波来抑制散斑噪声。实验结果表明空域高斯核函数处理法能有效地抑制零级像,非局部均值滤波可以抑制散斑噪声但对部分细节的保持能力不强,改进后的非局部均值滤波在抑制散斑噪声的同时能很好地保护细节信息,提高了离轴数字全息再现像的质量。
In order to suppress the influence of zero-order image and speckle noise on the reproduced image in the reflection off-axis digital holographic reproduced image, the Gaussian kernel function is used to low-pass filter the digital hologram in the airspace, and then the original digital hologram subtracts the filtered Of the low-frequency information to suppress zero-order image, using non-local mean filter to suppress speckle noise. The experimental results show that the airspace Gaussian kernel function method can effectively suppress the zero-order image, the non-local mean filter can suppress the speckle noise but not retain the partial detail, and the improved non-local mean filter suppresses speckle noise Can well protect the details and improve the quality of the digital holographic reconstructed image.