Quick response coding and CMYK color space multi-color image optical encryption method

Abstract

The invention belongs to the field of optical encryption technology and information security. The method aims at solving the encryption problem of a color image with a four-channel CMYK color space inthe full-color printing process. Various password attack encryption methods for effectively resisting known noise attacks, shearing attacks, plaintext attacks, selective plaintext attacks and the like are provided. The invention discloses a quick response coding and CMYK color space multi-color image optical encryption method, wherein the input is an original cyan-fuchsin-yellow-black CMYK colorimage; the method comprises the following steps of: obtaining a color QR code image which is the same as a CMYK color space by performing a coding process on a quick response coded QR code, outputtinga grayscale encrypted image through an encryption process of Fresnel-linear regularization-fractional Fourier transform (FLF), and meanwhile, generating three main keys in the encryption process; andthe decryption process is an inverse process of the encryption process. The method is mainly applied to information security encryption occasions.

Description

technical field [0001] The invention belongs to the field of optical encryption technology and information security, and relates to an optical encryption method for multiple color images based on quick response coding and CMYK color space. Background technique [0002] With the continuous development of image acquisition technology and the continuous improvement of acquisition accuracy, it is not uncommon for criminals to collect printed images through high-precision scanners and print them again to produce counterfeit goods and disrupt market order. In the printing process, the CMYK (cyan-magenta-yellow-black) color space is generally used, but the digital images obtained by the scanner are mostly displayed in the RGB (red-green-blue) color space. The use of two different color spaces in the printing and scanning process will inevitably lead to the conversion of the color space of the image during the printing and scanning process, resulting in the transfer or even loss of ...

AI Technical Summary

Problems solved by technology

But the problem is that it takes up a lot of space and reduces the transmission efficiency

However, there are also cases where crosstalk noise leads to a serious degradation in the quality of the decrypted image

Images