Double-random-phase optical color image encryption device and method

Abstract

The invention relates to a double-random-phase optical color image encryption device and method, which belong to the field of optical image processing technique. The double-random-phase optical color image encryption device comprises an optical image encryption device and an optical image decryption device. The double-random-phase optical color image encryption device has high flexibility by adopting a joint fractional Fourier transform correlator, and the encryption technique based on the joint fractional Fourier transform correlator structure has high safety even if a correct phase mask cannot decrypt the original image information if the position has a slight change due to the translation variability of the fractional Fourier transform. The decryption device can be achieved only by arranging an electronic shutter of the encryption device and using the original illumination parallel light as the light source, and does not generate the optical field distribution conjugated to the encryption process. Based on the parallel processing characteristics of an optical information processing system, the double-random-phase optical color image encryption device can achieve color image encryption and decryption by use of single wavelength. Therefore, the double-random-phase optical color image encryption device has the advantages of simple structure, simplified system, lowered cost, high safe performance, and wide application range, and is convenient in operation.

Description

technical field [0001] The invention belongs to the technical field of optical image processing, in particular to a dual random phase optical color image encryption device and method based on a joint fractional transform correlator. Background technique [0002] Information encryption and anti-counterfeiting technology is an important content in today's information security field, among which optical and photoelectric information encryption and anti-counterfeiting technology are favored by people because of their parallelism, high speed and low cost. With the rapid development of computers and the rapid development of CCD technology, image processing software and hardware, laser printers and scanners, text and images, as well as credit cards, certificate trademarks, etc. loss. Although since the 1990s, the laser holographic industry has developed rapidly, and the application range of laser anti-counterfeiting holographic marks has become larger and larger. However, with the...

AI Technical Summary

Problems solved by technology

The use of double random phase encryption technology requires the production of conjugated random phase plates during the decryption process. In the production process, due to process limitations and other factors, the inevitable errors will make it difficult to achieve optical decryption.

The optical encryption technology based on the phase recovery algorithm is a kind of optical encryption technology that can be verified from the simulation. This technology ignores some problems that will occur in the actual operation process, and it is difficult to achieve the real optical realization at present.

Images