Secured single-pixel broadcast imaging

Abstract

Active single-pixel imaging (also known as illumination-modulated single-pixel imaging) employs a spatial light modulator to illuminate a scene with structured patterns. The scheme of active single-pixel imaging is similar to a wireless broadcast system, allowing that multiple receivers use a single-pixel detector to capture an image simultaneously from a different place. The use of basis patterns allows for high-quality reconstructions and an efficient sampling process, but the public knowledge of the basis patterns is not a favorable feature for security applications. In order to develop a secured broadcast single-pixel imaging system, we propose to employ block-permutated Hadamard basis patterns for illumination. The randomness in permutation operations introduces strong security characteristics for the system. Both simulation and experimental results demonstrate our proposed scheme has satisfactory imaging quality and efficiency. This work generates a new insight for the application of single-pixel imaging and provides a solution for developing a secured imaging system for non-visible wavebands.

Visual cryptography in single-pixel imaging

“…In the current optical setup for these two visual cryptography schemes, the two object images are placed nearby and the two sets of illumination patterns are projected close to each other. In fact, the pattern illumination for the two objects are not necessarily performed nearby [27,30]. They can be separately performed out of the line-of-sight and even at two far-away locations.…”

“…These two schemes have common features from this perspective. In previous works [26][27][28][29][30][31], optical encryption with SPI has been extensively investigated but the VC framework has never been attempted.…”

Known-Plaintext Attack and Ciphertext-Only Attack for Encrypted Single-Pixel Imaging

“…For other types of optical encryption systems such as DRPE [4], various implementations of encryption systems [24][25][26][27][28] and various types of cryptanalysis [29][30][31][32][33][34][35] including CPA, KPA and COA have been extensively investigated. However, for encrypted SPI, many works have been conducted on the design of encryption systems [12][13][14][15][16][17][18][19][20][21] since the earliest attempt [12] but little cryptanalysis has been investigated previously. As far as the author knows, only one such work [36] can be found, in which some CPA methods are proposed.…”

A Novel Compressive Optical Encryption via Single-Pixel Imaging

“…The random patterns were suitable for information protection as they are naturally unrecognizable, unfortunately, this way is inefficient since it normally requires a huge number of patterns, nevertheless, the signal-to-ratio (SNR) of reconstructed images is also bad. For overcoming this issue, Zhang et al proposed a secured single-pixel broadcast method using permutated Hadamard basis patterns, which improved the image quality of the reconstructed results [22]. The orthogonal basis patterns such as Hadamard and Fourier basis are efficient for encoding, however, it consists of fixed number of patterns, which was a complete measurement.…”