Neural network generation of adaptive filter and new applications in remote sensing image processing

TANG Ping; LIU Xuan; JIN Xing; ZHANG Zheng

doi:10.11834/jrs.20232174

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Neural network generation of adaptive filter and new applications in remote sensing image processing
Vol. 27, Issue 7, Pages: 1523-1533(2023)
Received：20 March 2022，

Published：07 July 2023
DOI： 10.11834/jrs.20232174
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唐娉，刘璇，金兴，张正.2023.自适应滤波器的神经网络生成及遥感图像处理新应用.遥感学报，27（7）： 1523-1533 DOI： 10.11834/jrs.20232174.

Tang P， Liu X， Jin X and Zhang Z. 2023. Neural network generation of adaptive filter and new applications in remote sensing image processing. National Remote Sensing Bulletin， 27（7）：1523-1533 DOI： 10.11834/jrs.20232174.

摘要

图像自适应滤波是非线性的图像变换，有广泛的应用场景。传统的图像自适应滤波器均是专家设计的，如双边滤波器和形状自适应滤波等。CNN作为特征提取和非线性能力表达的有效工具，可用于学习构造图像自适应滤波器。本文首先介绍了图像自适应滤波器的生成网络，继而介绍了图像自适应滤波的两个图像处理的新应用：不同时相间的图像变换用于图像插值、不同波段间的图像变换用于图像融合。从这两类应用中，可以窥见图像自适应滤波在构建图像非线性变换方面的应用能力。

Abstract

Image adaptive filtering is a nonlinear image transformation

which has a wide range of applications. Traditional image adaptive filters are designed by experts

such as bilateral filter and shape adaptive filter. They can determine the shape

size

and weight of the filter based on the local structure and content of the image. They are commonly used to suppress noise while preserving the structural characteristics of the image. Convolutional Neural Networks (CNNs) are an effective tool for feature extraction and nonlinear expression. They can be used to learn and construct image adaptive filters. And this paper explores the application of nonlinear image adaptive filters generated by convolutional neural networks in image interpolation and image fusion.

This paper introduces the generation network of an image adaptive filter

including its model structure and objective function. The common network structure usually employs an encoder-decoder architecture

which is mainly composed of three parts: feature extraction

feature recovery

and filter (convolution kernel) estimation. Then

the paper presents two different application scenarios of image adaptive filters: image interpolation and image fusion. The adaptive filter for images enables transformation between different phases during image interpolation and transformation between different bands during image fusion. In these two scenarios

the image adaptive filters are learned by the filter generation network based on the specific application scenario and then applied. In image interpolation applications

the image adaptive filter is used as a nonlinear transformation between two temporal images. The interpolated image is looked at as the mean of adaptive filtering of the previous temporal image and adaptive filtering of the latter temporal image. In image fusion applications

the image adaptive filter is used as a nonlinear fitting method to regress multispectral bands to the panchromatic band. It then extracts spatial details from the difference of the panchromatic band and the simulated panchromatic band

and finally adds spatial details to all the multispectral bands.

We conducted experiments in two application scenarios. The first involved nonlinear transformation for image interpolation with different phases simultaneously. The second utilized an image adaptive filter as a nonlinear fitting method for multi-spectral band regression panchromatic band in image fusion. In image interpolation applications

the experimental results show that the interpolated results are consistent with the reference image in spatial and spectral characteristics

and the RMSE of the interpolated image with the reference image is relatively small. The experimental results for image fusion applications indicate that the low-resolution panchromatic band obtained through adaptive filter fitting of the multi-spectral band is more accurate than the traditional component replacement method. The fusion result obtained by nonlinear image adaptive filters has neither obvious spectral distortion nor obvious spatial distortion.

From the application of nonlinear image adaptive filters generated by convolutional neural networks in image interpolation and image fusion

we have a glimpse of its application potential of image adaptive filter in constructing image nonlinear transformation. The filter generation network can generate adaptive filters for particular application scenarios

resulting in more accurate and visually pleasing images.

关键词

Keywords

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