Lensless imaging through the Fourier-ADMM network with a cost-effective and easily fabricated phase mask

In this Letter, we introduce the Fourier-ADMM (alternating direction method of multipliers) network, improving the Fourier-ADMM algorithm by integrating it with an additional backpropagation process. Simultaneously, we develop a cost-effective and easily fabricated phase mask for lensless imaging systems. While the simplified phase mask may challenge the image quality for its faults such as low contrast and a suboptimal signal-to-noise ratio, the capabilities of the Fourier-ADMM network effectively mitigate these issues. The fabrication of the phase mask requires inexpensive and readily available raw materials and tools, and the process itself does not necessitate any highly specialized or precision operations. Our experimental results demonstrate that, with the backing of this advanced decoding network, the camera equipped with the simplified phase mask is capable of delivering high-quality imaging and rapid response times.