利用兩個(gè)彼此獨(dú)立的編碼脈沖相位掩模在聯(lián)合變換相關(guān)器中對(duì)需要保護(hù)的圖像進(jìn)行編碼，實(shí)現(xiàn)對(duì)原始圖像的加密。該方法的特點(diǎn)是解密時(shí)加密圖像的旋轉(zhuǎn)不會(huì)影響解密效果，相位分布是密鑰的合法持有者唯一掌握的確定性函數(shù)，可以重構(gòu)，便于實(shí)際應(yīng)用。計(jì)算機(jī)模擬的結(jié)果證明了方法的可行性。
關(guān) 鍵 詞 光學(xué)圖像; 加密; 聯(lián)合變換; 旋轉(zhuǎn)不變; 編碼脈沖信號(hào); 相位掩模板

Two phase mask plate with independent chirp signals are used to encode image in the joint transform correlator,so as to make encrypt the original image.The characteristic of this method is when decoding,the rotation of encrypted image can not affected decoding effect,and moreover,owing to the fact that phase distribution is a decisive function only grasped by owner of secure key and the secure key can be regenerated.It makes the practical use convenient.The results of computer simulation shows the feasibility of this method.