Visual cryptography in single-pixel imaging
This work addresses the need for more diversified scenarios in visual cryptography applications, though it appears incremental as it adapts existing techniques to a new imaging method.
The paper tackles the problem of extending visual cryptography applications by proposing two novel schemes that combine visual cryptography with single-pixel imaging for the first time, resulting in methods that use opaque sheets or multiple illumination patterns to recover secret images.
Two novel visual cryptography (VC) schemes are proposed by combining VC with single-pixel imaging (SPI) for the first time. It is pointed out that the overlapping of visual key images in VC is similar to the superposition of pixel intensities by a single-pixel detector in SPI. In the first scheme, QR-code VC is designed by using opaque sheets instead of transparent sheets. The secret image can be recovered when identical illumination patterns are projected onto multiple visual key images and a single detector is used to record the total light intensities. In the second scheme, the secret image is shared by multiple illumination pattern sequences and it can be recovered when the visual key patterns are projected onto identical items. The application of VC can be extended to more diversified scenarios by our proposed schemes.