Application of input amplitude masks in scheme of optical image encryption with spatially-incoherent illumination

5th International Conference of Photonics and Information Optics

Shifrina, A.V.^1 ; Evtikhiev, N.N.^1 ; Krasnov, V.V.^1

National Research Nuclear University MEPhI, Moscow Engineering Physics Institute, Kashirskoe shosse 31, Moscow

115409, Russia^1

关键词: Encrypted images;    Encryption technique;    Incoherent illumination;    Low-spatial frequency;    Optical encryption;    Optical image encryption;    Original images;    Spatial frequency;   

Others  :  https://iopscience.iop.org/article/10.1088/1742-6596/737/1/012063/pdf
DOI  :  10.1088/1742-6596/737/1/012063

来源: IOP

【 摘 要 】

Optical encryption with spatially incoherent illumination does not have drawbacks of coherent encryption techniques. In this case however, one of the factors affecting decrypted image quality is original image spectrum. In most cases, majority of image energy is concentrated in area of low spatial frequencies. Therefore, only this area in spectrum of encrypted image contains information about original image, while other areas contain only noise. Additional amplitude encoding of input scene can be used for increase of the size of the area of spatial frequencies containing useful information. Numerical simulation demonstrates reduction of decryption error up to 2.7 times.