期刊
SIGNAL PROCESSING
卷 178, 期 -, 页码 -出版社
ELSEVIER
DOI: 10.1016/j.sigpro.2020.107746
关键词
Compressive sensing; Difference of Gaussian; Encoding scheme; Human visual system; Single pixel compressive imaging
Compressive sensing aims to achieve high fidelity image recovery with a low number of measurements using an encoding scheme based on filtering the scene. The structured measurement matrix formed by the encoding patterns, which are linearly independent vectors, allows relatively well-conditioned dictionaries to be created using different sparsifying bases.
As its name implies, compressive sensing aims to bring compression during sampling. However, the deployment of this technique depends on recovering a high fidelity image through a low number of measurements with a simple hardware and fast software. To this end, we introduce an encoding scheme that by filtering the scene acquires information about the image structure. To prepare a set of proposed encoding patterns, at the first step, a filter bank containing a number of Difference of Gaussian (DoG) kernels with different scales is prepared. Then, by randomly selecting the filters from the bank and under-sampling the scene with them at random points, each encoding pattern is constructed. The idea is inspired by the Human Visual System (HVS) that uses a set of size-tuned DoG kernels at each point in the field-of-view. These encoding patterns, which make a set of linearly independent vectors, form the rows of a structured measurement matrix. This matrix allows making relatively well-conditioned dictionaries by different sparsifying bases. The effectiveness of this method is confirmed by simulations and analyses. (C) 2020 Elsevier B.V. All rights reserved.
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