非均匀量化数字全息图及在信息隐藏中的应用  

Nonuniform Quantization Digital Holography and Its Application in Information Hiding

作　　者：陈家祯[1] 郑子华[1] 连桂仁[1] 叶锋[1] 

机构地区：[1]福建师范大学数学与计算机学院,福建福州350007

出　　处：《激光与光电子学进展》2010年第12期43-49,共7页Laser & Optoelectronics Progress

基　　金：福建省教育厅B类(JB07051;JB09064)资助课题

摘　　要：提出一种采用非均匀量化思想编码傅里叶变换数字全息图的方法,并以均匀量化数字全息图为对比,分析了所生成的数字全息图在量化噪声功率方面的改善情况。仿真结果表明,在编码位数相同的情况下,采用非均匀量化编码方案生成的数字全息图具有更低的量化噪声功率及更好的再现质量,作为水印信号使用时,在遭受同等强度高斯噪声或椒盐噪声干扰的情况下,从嵌有非均匀量化数字全息水印的载体图像中可以复原出更清晰的数字再现像。而在抗剪切、抗JPEG压缩等方面表现出与均匀量化全息水印相类似的稳健性。该方法可用于信息隐藏应用中对全息水印信号的预处理及全息图的数字化存贮、转换及处理等。A nonuniform quantization encoding method for Fourier transform digital holography is proposed.The generated digital holography in quantization noise power aspect has been analyzed and compared with the uniform quantization holography.The simulation results show that the nonuniform quantization method can bring lower quantization noise power and better quality of the reconstructed image under the condition of the same encoding bits.A clearer digital reconstructed image can be retrieved from the carrier image embedded with nonumiform quantization digital holographic watermark when suffered from the same intensity of the Gaussian noise or salt and pepper noise.The similar robustness is also shown in anti-cropping and anti-JPEG compression performance.The proposed method can be used in the pre-processing stage of the holographic watermark in information hiding application or digital storage,transform and processing of the hologram,etc.

关 键 词：数字全息 非均匀量化 傅里叶变换 数字压扩 

分 类 号：O438.1[机械工程—光学工程]