The digital watermark technique is proposed based on Fresnel hologram and Discrete Cosine Transform(DCT). 提出了一种基于数字菲涅耳全息和离散余弦变换(DCT)的数字水印技术。
Data correlation coefficients were calculated and switch regions were analyzed by using two dimension discrete cosine transform ( DCT ) in ray-space data compression. 在光线空间的数据压缩中,计算了数据的相关系数,采用二维离散余弦变换(DCT)(DCT)进行了变换域分析。
This paper presents a novel steganographic method in Discrete Cosine Transform(DCT) ( DCT ) domain. 提出了一种在图像DCT域内的信息隐藏方法。
The fast algorithm based on discrete cosine transform ( DCT ) and its complexity are obtained and the selection of the best basis is discussed. 给出了用离散余弦变换(DCT)(DCT)实现的快速算法及复杂度,并考查了最优基的选取。
It is a new method that calculate vertical second derivative of gravity anomalies based on discrete cosine transform ( DCT ). 基于离散余弦变换(DCT)(DCT)的重力异常垂向二阶导数的计算方法是笔者提出的新方法。