Study Of Optical Information Security Techniques Based On Single-pixel Imaging And Compressed Coded Aperture Imaging

Since the human society has stepped into the era of informatization and digitalization,the dissemination and sharing of information seems to be on the fast track When people's traditional life style is challenged,information security has also become a topic that people pay close attention to all the timeWith the generation change and development of communication technology,the transmission of image and video information becomes extremely easy,and the research on information security of image is widely concernedOptical information security is an emerging interdisciplinary subject used in the fields of optical image encryption,concealment and authentication.In recent years,computational optical imaging techniques such as single pixel imaging and compressive coded apertures imaging have been developed gradually.Traditional optical imaging is a "what you see is what you get" imaging method,which uses optical instruments such as lenses to concentrate the reflected light of objects,and obtains the optical image by spectral splitting,interference and other operations.However,in computational optical imaging,the direct result obtained by the detector is often not the scene to be imitated,which requires image reconstruction by computer algorithmThis paper systematically introduces the basic principles of single pixel imaging and compressive coded apertures imaging,and explores their applications in the field of optical information security.The specific contents are as follows(1)An optical image information hiding scheme based on singular value decomposition single pixel imaging(SVDSPI)is proposed.The original secret image is firstly sampled and encrypted by SVDSPI,and then embedded into the host image by watermarking algorithm based on block discrete cosine transform and integer lifting wavelet transform.The measurement matrix in the SVDSPI algorithm is the key to recover the secret image.In addition,the proposed watermarking algorithm has the characteristics of large capacity and good robustness,and the original host image is not needed to extract the watermark.(2)A single-channel color optical image information hiding scheme based on discrete cosine transform(DCT)single pixel imaging and lifting wavelet transform is proposed.The DCT spectrum of the original secret image can be obtained by using DCT single pixel imaging and color filter array to double sample the space and color of the original secret image.Only with the correct key can the valid information be extracted and the original color image be reconstructed.The single-channel color imaging scheme can greatly save time and space costs.In addition,the proposed watermarking algorithm has the characteristics of good imperceptibility and good robustness.(3)A multi-image encryption method based on compressive coded apertures imaging and pixel position scrambling is proposed.In the process of encryption,each plaintext image is compressed by its corresponding coding mask,which is generated by code division multiple access(CDMA)modulation with a given auxiliary random matrix.Then,the charge-coupled device(CCD)is used to record all the encoded images and generate a superimposed image.Finally,the superimposed image is scrambled to obtain the ciphertext image.During the decryption process,the participants with the correct key group can successfully recover the corresponding plaintext image through the location index key,the secondary key,and the compressed sensing reconstruction algorithm.