Multi-image super-resolution based low complexity deep network for image compressive sensing reconstruction☆

Deep learning (DL) has been widely utilized in image compressive sensing (CS) to enhance the quality and speed of reconstruction. The typical deep network for CS reconstruction comprises an initial reconstruction subnetwork, followed by a cascaded deep refinement reconstruction subnetworks. This paper introduces a new low-complexity image CS deep reconstruction framework, GSRCS, which leverages multi-image based deep super-resolution technology to better address the cost constraints of practical applications. The proposed initial reconstruction module generates multiple low-resolution images in parallel by grouping the input measurements, while a high-quality, high-resolution reconstructed image is produced through a multi-image deep super-resolution network. The theoretical derivation and experimental results demonstrate that this method significantly reduces system complexity in terms of parameters and floating-point arithmetic operations, while achieving competitive reconstruction performance compared to the state-of-the-arts. Specifically, the average number of parameters is reduced by over 63%, and the computational complexity is decreased by more than 88%.