Lossy compression of hyperspectral images using shearlet transform and 3D SPECK

A. Karami

doi:10.1117/12.2191850

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15 October 2015 Lossy compression of hyperspectral images using shearlet transform and 3D SPECK

A. Karami

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Proceedings Volume 9643, Image and Signal Processing for Remote Sensing XXI; 96431J (2015) https://doi.org/10.1117/12.2191850
Event: SPIE Remote Sensing, 2015, Toulouse, France

Abstract

In this paper, a new lossy compression method for hyperspectral images (HSI) is introduced. HSI are considered as a 3D dataset with two dimensions in the spatial and one dimension in the spectral domain. In the proposed method, first 3D multidirectional anisotropic shearlet transform is applied to the HSI. Because, unlike traditional wavelets, shearlets are theoretically optimal in representing images with edges and other geometrical features. Second, soft thresholding method is applied to the shearlet transform coefficients and finally the modified coefficients are encoded using Three Dimensional- Set Partitioned Embedded bloCK (3D SPECK). Our simulation results show that the proposed method, in comparison with well-known approaches such as 3D SPECK (using 3D wavelet) and combined PCA and JPEG2000 algorithms, provides a higher SNR (signal to noise ratio) for any given compression ratio (CR). It is noteworthy to mention that the superiority of proposed method is distinguishable as the value of CR grows. In addition, the effect of proposed method on the spectral unmixing analysis is also evaluated.

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A. Karami "Lossy compression of hyperspectral images using shearlet transform and 3D SPECK", Proc. SPIE 9643, Image and Signal Processing for Remote Sensing XXI, 96431J (15 October 2015); https://doi.org/10.1117/12.2191850

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