Full-color image encryption via semi-differential two-step Fourier SPI and OAM-multiplexed holography

作者：Chengbin Wang, Lexin Yang, Menghao Jia, Hailong Zhang, xu bj, Xiaogang Wang · 发表于：Optics Express · 年份：2026 · DOI：10.1364/oe.607271 · 研究领域：Chaos-based Image/Signal Encryption、Advanced Steganography and Watermarking Techniques、Sparse and Compressive Sensing Techniques

The integration of indirect imaging with optical multiplexing has become a prominent trend in optical encryption. This work proposes a high-security full-color image encryption scheme based on semi-differential two-step phase-shifting Fourier single-pixel imaging (SD2FSI) with orbital-angular-momentum (OAM) multiplexed holography. In encryption, grayscale Fourier basis patterns are generated via the SD2FSI method and converted into color illumination patterns using a Bayer-like mask. The acquired bucket signals, together with sampling region parameters, sampling path sequence, and data length, are encoded into a ciphertext hologram by structured-light multiplexing with multi-ramp helical-conical (MHC) beams. For decryption, accurately matched MHC beams and a binary matrix key are required to extract complete and sequentially correct bucket signals for Fourier spectrum demodulation and image reconstruction. The proposed scheme exhibits an intrinsic and strict dependence on data integrity and sequence consistency, which fundamentally invalidates attacks based on partial-data interception and rearrangement. Experimental results demonstrate faithful full-color reconstruction together with extreme fragility under key perturbations, confirming that the fusion of SD2FSI's intrinsic data-integrity dependence with OAM-multiplexed holography establishes a computationally secure optical encryption framework with abundant physical and algorithmic key dimensions.