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Adaptive wavelet-based deconvolution method for remote sensing imaging

机译:基于自适应小波的反卷积遥感影像方法

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摘要

Fourier-based deconvolution (FoD) techniques, such as modulation transfer function compensation, are commonly employed in remote sensing. However, the noise is strongly amplified by FoD and is colored, thus producing poor visual quality. We propose an adaptive wavelet-based deconvolution algorithm for remote sensing called wavelet denoise after Laplacian-regularized deconvolution (WDALRD) to overcome the colored noise and to preserve the textures of the restored image. This algorithm adaptively denoises the FoD result on a wavelet basis. The term "adaptive" means that the wavelet-based denoising procedure requires no parameter to be estimated or empirically set, and thus the inhomogeneous Laplacian prior and the Jeffreys hyperprior are proposed. Maximum a posteriori estimation based on such a prior and hyperprior leads us to an adaptive and efficient nonlinear thresholding estimator, and therefore WDALRD is computationally inexpensive and fast. Experimentally, textures and edges of the restored image are well preserved and sharp, while the homogeneous regions remain noise free, so WDALRD gives satisfactory visual quality.
机译:基于傅立叶的反卷积(FoD)技术(例如调制传递函数补偿)通常用于遥感中。但是,噪声会被FoD强烈放大并被着色,从而产生较差的视觉质量。我们提出了一种自适应的基于小波的反卷积算法,该算法用于拉普拉斯正则化反卷积(WDALRD)之后的遥感信号的小波降噪,以克服彩色噪声并保留还原图像的纹理。该算法以小波为基础对FoD结果进行自适应降噪。术语“自适应”意味着基于小波的去噪过程不需要估计或凭经验设置参数,因此提出了非均匀拉普拉斯先验和杰弗里斯超先验。基于这种先验和超先验的最大后验估计使我们得到了一种自适应,高效的非线性阈值估计器,因此WDALRD在计算上便宜且快速。实验上,恢复图像的纹理和边缘得到了很好的保留和清晰,而均匀区域保持无噪点,因此WDALRD可以提供令人满意的视觉质量。

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