Compression and storage of multiple images with modulating blazed gratings
Shen Yin, Shaohua Tao · Journal of Optics · 2013
A method for compressing, storing and reconstructing high-volume data is presented in this paper. Blazed gratings with different orientations and blaze angles are used to superpose many grayscaled images, and customized spatial filters are used to selectively recover the corresponding images from the diffraction spots of the superposed images. The simulation shows that as many as 198 images with a size of 512 pixels × 512 pixels can be stored in a diffractive optical element (DOE) with complex amplitudes of the same size, and the recovered images from the DOE are discernible with high visual quality. Optical encryption/decryption can also be added to the digitized DOE to enhance the security of the stored data.