At the same time, an adaptive algorithm based on block DCT for digital watermarking are advanced.
论文首先对信息隐藏的相关理论加以阐述,在此基础上,介绍数字水印技术的典型算法,提出一种自适应的基于分块DCT的数字水印算法。
参考来源 - 数字水印技术在图像版权保护中的应用研究·2,447,543篇论文数据，部分数据来源于NoteExpress
Secondly, block DCT algorithm based on chaos is proposed.
其次给出了基于混沌的分块dct算法。
The meaningful gray image is serially processed into watermark signal and embedded into the DC elements of the block DCT coefficient matrix of the host image.
该算法是先对有意义的灰度图像进行水印序列化处理后，再将其作为水印信号嵌入到载体图像的分块DCT系数直流分量里。
Unfortunately, in these situations, the notorious blocking artifacts resulting from block DCT set a severe limit on the achievable bit-rate with acceptable quality.
然而，基于DCT的传统视频压缩方法由于在低比特率下出现块失真严重影响恢复视频质量。
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