Main Article Content
Since image processing algorithms can work with a vast volume of data easily, optical cryptographic techniques are commonly used in image security. Since the proposed DRPE, image encryption in particular has gotten a lot of coverage. DRPE employs various approaches for example-4f and Fourier Transform (FT) to encrypt local as well as spectral data; image encryption is done on the basis of input along with the Fourier planes using random phase coding. The complete process of encryption transforms the input image to a white sound in this manner. Confidentiality is obtained by the method of translation. Only when the information of location and the secret key are perfectly matched would the secret picture be revealed. Random category masks may be thought of as hidden keys in general, and since the key space is too big, blind deconvolution alone is insufficient to reconstruct the original picture. The standard DRPE methodology was discussed in this paper, as well as its numerical emulation, sampling considerations in the spatial as well as frequency domains, and the benefits and drawbacks of different transforms. Additionally, certain optical coding and scrambling methods are investigated. The paper ends with a discussion of recent advances in the area of optical image encryption, as well as a look forward to the future challenges.