1、

A digital map watermarking algorithm based on discrete cosine transform ( DCT ) is presented.

设计了一个基于 DCT 的数字地图水印算法.

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2、

We have also studied the variance spectral configuration of surfacefield using DCT ( Discrete Cosine Transform ).

并采用了离散余弦转换( DCT ) 对其方差的波谱结构进行了讨论.

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3、

The fast DCT algorithm not only can reduce the multiplication number, but also can combine the post-scaling and matrix transpose needed for fast DCT with the quantization and scan processes, so as to speed up the whole MPEG encoder.

本章提出的快速DCT算法不仅减少了所需乘法的次数,而且变换后的后置乘法和矩阵转置过程可与量化和扫描相结合,进一步加速浙江大学博士学位论文整个MPEG编码过程。

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4、

It quantizes the low frequency DCT coefficients with fine level and the high frequency DCT coefficients with coarse level, But JPEG does not specifically process the image edges, which are partly hiding in high frequency DCT coefficients.

JPEG充分利用人眼的视觉特性,对DCT系数的低频系数进行细量化,而对高频系数进行粗量化,但未对图像的边缘特征进行特殊的处理。

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