Optical image compression and encryption methods

Abstract

Over the years extensive studies have been carried out to apply coherent optics methods in real-time communications and image transmission. This is especially true when a large amount of information needs to be processed, e.g., in high-resolution imaging. The recent progress in data-processing networks and communication systems has considerably increased the capacity of information exchange. However, the transmitted data can be intercepted by nonauthorized people. This explains why considerable effort is being devoted at the current time to data encryption and secure transmission. In addition, only a small part of the overall information is really useful for many applications. Consequently, applications can tolerate information compression that requires important processing when the transmission bit rate is taken into account. To enable efficient and secure information exchange, it is often necessary to reduce the amount of transmitted information. In this context, much work has been undertaken using the principle of coherent optics filtering for selecting relevant information and encrypting it. Compression and encryption operations are often carried out separately, although they are strongly related and can influence each other. Optical processing methodologies, based on filtering, are described that are applicable to transmission and/or data storage. Finally, the advantages and limitations of a set of optical compression and encryption methods are discussed.

A Novel Chaotic based Optical Color Image Encryption Technique

“…A technique which replaced the traditional preprocessing complex system and utilized the basic operations like confusion, diffusion which provided same or better encryption using cascading of 3D standard and 3D cat map has been presented in [12]. Optical encryption and compression methods have been discussed in [13]. The approach of image encryption using the concept of sieving, dividing and shuffling has been described in [14].…”

“…Rotation by different degrees has been studied and we will choose rotation by 5 degrees as an example. All simulation results as well as performance metrics will be provided for image (2) as an example as follows.…”

“…The simulation results and histogram analysis for image (2) as an example will be illustrated in the following figures. The original image has been imposed to centralized cropping with block of size 100×100.…”

“…Digital multimedia can be manipulated or reproduced easily without the loss of information using effective multimedia processing tools that are widely available [1]. Over the years many researches have been directed toward coherent optics because of the potential for new technological applications in telecommunications [2,3]. In recent years, optical encryption has reached a level of maturity with the publication of realistic attacks that exploit its inherent weakness of linearity [4][5][6].…”

Three-dimensional complex image coding using a circular Dammann grating

“…In addition, optical image coding, as opposed to electronic or digital image coding, can provide many degrees of freedom for coding. Recently, there has been a review article on the subject [1]. In this paper, we investigate a 3D optical image coding technique that is complex-amplitude based.…”