Single-pixel imaging combined with compressed sensing can reconstruct high-quality images of an imaged object from a small part of the measurement results of a bucket detector without a spatial resolution. However, at low sampling rates, randomly selected projected speckle sequences limit the quality of reconstructed images. To achieve improved imaging at very low sampling rates, this paper proposes a data-driven Hadamard matrix sorting scheme, which uses the training effect of an entire dataset to adaptively select transmitted speckle signal sequences. In the process of reconstructing an image, two different compressed-sensing-related algorithms are employed to realize the image reconstruction of an imaged object at an ultra-low sampling rate of 5% in a numerical simulation and physical experiment, and it is sorted with the current optimal correlation Hadamard matrix. The schemes are compared, and it is found that the reconstruction effect of the method proposed in this paper is better at sampling rates of 1% to 5%. The research results presented in this paper can be used to increase the imaging speed of single-pixel imaging, and can be applied to fields such as imaging guidance and medical imaging.
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