不同频率域滤波器的去噪效果比较分析

Comparative Analysis of Denoising Effects of Different Frequency Domain Filters

无人机图像去噪是数字图像处理过程中的重要的预处理部分,是对地观测时能否采集到清晰图像的基础,间接影响图像后期处理的准确性和结果。因此,为后续的影像处理工作提供更有利的技术保障,研究不同频率域滤波器的去噪效果具有非常重要的研究意义。实验目的是在于选取出不同噪声情况下去噪效果最佳的频率域滤波器。实验采用3种频率域滤波器对无人机影像进行高斯噪声、椒盐噪声及2种噪声混合的情况下进行去噪。实验结果表明:当图像只有高斯噪声时,高斯低通滤波器具有最佳的去噪效果;当图像只有椒盐噪声时,高斯低通滤波器具有最佳的去噪效果;在高斯噪声以及椒盐噪声混合的情况下,Butterworth低通滤波器的去噪效果最好。

Unmanned aerial image denoising is an important pre - processing part in the process of digital image processing.It is the basis for the acquisition of clear images during ground observation, which indirectly affects the accuracy and results of image post - processing.Therefore,it provides more favorable technical support for the subsequent image processing work.It is very important to study the denoising effect of different frequency domain filters.The purpose of the experiment is to select the frequency domain filter with the best noise effect in different noise situations.In this paper, three kinds of frequency domain filters are used to denoise the UAV image with Gaussian noise, salt and pepper noise and two kinds of noise mixing.The experimental results show that the Gaussian low - pass filter has the best denoising effect when the image only has Gaussian noise;the Gaussian low - pass filter has the best denoising effect when the image has only salt and pepper noise;Gaussian noise and salt and pepper noise in the case of mixing,the Butterworth low - pass filter has the best denoising effect.