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Satellite Image Resolution Enhancement Using Complex Wavelet Transform

机译:使用复小波变换增强卫星图像分辨率

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摘要

In this letter, a satellite image resolution enhancement technique based on interpolation of the high-frequency subband images obtained by dual-tree complex wavelet transform (DT-CWT) is proposed. DT-CWT is used to decompose an input low-resolution satellite image into different subbands. Then, the high-frequency subband images and the input image are interpolated, followed by combining all these images to generate a new high-resolution image by using inverse DT-CWT. The resolution enhancement is achieved by using directional selectivity provided by the CWT, where the high-frequency subbands in six different directions contribute to the sharpness of the high-frequency details such as edges. The quantitative peak signal-to-noise ratio (PSNR) and visual results show the superiority of the proposed technique over the conventional bicubic interpolation, wavelet zero padding, and Irani and Peleg based image resolution enhancement techniques.
机译:在本文中,提出了一种基于对通过双树复小波变换(DT-CWT)获得的高频子带图像进行插值的卫星图像分辨率增强技术。 DT-CWT用于将输入的低分辨率卫星图像分解为不同的子带。然后,对高频子带图像和输入图像进行插值,然后通过使用逆DT-CWT组合所有这些图像以生成新的高分辨率图像。通过使用CWT提供的方向选择性来实现分辨率增强,其中六个不同方向上的高频子带有助于提高高频细节(如边缘)的清晰度。定量峰信噪比(PSNR)和视觉结果表明,所提出的技术优于常规的双三次插值,小波零填充以及基于Irani和Peleg的图像分辨率增强技术。

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