6 December 2022 Utilizing the structure of a redundant dictionary comprised of wavelets and curvelets with compressed sensing
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Abstract

The discrete curvelet transform decomposes an image into a set of fundamental components that are distinguished by direction and size and a low-frequency representation. The curvelet representation of a natural image is approximately sparse; thus, it is useful for compressed sensing. However, with natural images, the low-frequency portion is seldom sparse. This manuscript presents a method to modify the redundant sparsifying transformation comprised of the wavelet and curvelet transforms to take advantage of this fact for compressed sensing image reconstruction. Instead of relying on sparsity for this low-frequency estimate, the Nyquist–Shannon sampling theorem specifies a rectangular region centered on the 0 frequency to be collected, which is used to generate a blurry estimate. A basis pursuit denoising problem is solved to determine the details with a modified sparsifying transformation. Improvements in quality are shown on magnetic resonance and optical images.

© 2022 SPIE and IS&T
Nicholas Dwork and Peder E. Z. Larson "Utilizing the structure of a redundant dictionary comprised of wavelets and curvelets with compressed sensing," Journal of Electronic Imaging 31(6), 063043 (6 December 2022). https://doi.org/10.1117/1.JEI.31.6.063043
Received: 1 February 2022; Accepted: 16 November 2022; Published: 6 December 2022
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KEYWORDS
Wavelets

Associative arrays

Compressed sensing

Image quality

Magnetic resonance imaging

Wavelet transforms

Image restoration

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