CAJ | 학술논문

提出一种基于混沌和计算全息的光学加密技术。利用确定性非线性系统的混沌序列构成随机相位列阵，对物光波进行调制编码，并采用修正离轴参考光的博奇编码法，制作计算全息图，作为加密图像。解密时，只要获得正确的混沌序列初始值，就可以得到随机相位列阵，结合正确的系统结构参数，就可以重建清晰的原始图像。与传统的随机相位加密相比，混沌序列初始值作为密钥，减少了密钥的数据量；数字化的加密图有利于信息的保存和传输。模拟实验验证了它的可行性和有效性，并分析了抗裁剪和噪声的鲁棒性。
제출일충기우혼돈화계산전식적광학가밀기술。이용학정성비선성계통적혼돈서렬구성수궤상위렬진，대물광파진행조제편마，병채용수정리축삼고광적박기편마법，제작계산전식도，작위가밀도상。해밀시，지요획득정학적혼돈서렬초시치，취가이득도수궤상위렬진，결합정학적계통결구삼수，취가이중건청석적원시도상。여전통적수궤상위가밀상비，혼돈서렬초시치작위밀약，감소료밀약적수거량；수자화적가밀도유리우신식적보존화전수。모의실험험증료타적가행성화유효성，병분석료항재전화조성적로봉성。
a novel technique of optical image encryption and decryption based on computer generated hologram (CGH ) combined with chaotic theory is proposed .The object wavefront is modulated and encoded with the random phase array constructed by a chaotic sequence of the non -linear deterministic system , and then adopting Burch’s coding method of the modified off -axis reference beam to fabricate the CGH as the encryption image .As long as the initial value of Chaotic sequence given is correct ,the random phase array can be obtained easily ,combined with correct system parameters in the decryption ,a clear original image can be reconstructed by a simple calculation .The initial value of Chaotic sequence and system parameters served as keys reduce the amount of the key data , and also the digital encryption image is more favorable to be preserved and transmitted .The feasibility and its robustness against occlusion and noise attacks are verified by a series of numerical simulations .