基于 DCT 变换的频域视频水印在空域中实现的性能分析

数字水印技术是数字媒体版权保护和管理的主要方法。在广播电视领域,视频水印需处理的数据量大,对嵌入算法的时间复杂度限制较大,同时对视频质量要求也较高。数字水印技术主要分为空域和变换域两种。空域算法时间复杂度低,但鲁棒性不好;而变换域算法鲁棒性较好,但时间复杂度高。因此,在广播电视视频水印中,需要鲁棒性好且时间复杂度低的水印嵌入算法。这样,用空域的方法实现数字视频的变换域水印,就成为一个首选的方法。但是,目前我们尚不知道该方法的性能。本文基于DCT变换的频域水印算法,首先介绍了频域水印的空域实现的原理,然后,基于两个典型的频域水印算法,通过800幅图片的实验,测试了该算法的空域实现的时间复杂度和PSNR。实验结果表明,频域视频水印的空域实现,具有很好的性能。

Performance Analysis of Frequency Domain Video Watermark Implemented in Spatial Domain Based on DCT

Digital watermarking technology is the main method of digital media copyright protec-tion and management .In the field of broadcasting and television ,the data of video watermarking need to process is great ,the great data limits the time complexity of the watermarking algorithm ,and watermark-ing algorithm needs a higher requirement of video quality .Digital watermarking technology is mainly di-vided into spatial domain and frequency domain .Spatial domain watermark ’ s time complexity is low ,but the robustness is poor;frequency domain watermark ’ s robustness is better , but the time complexity is higher.Thus,it needs a good robustness and low time complexity watermarking in the field of broadcast and television .So,implementing frequency domain watermark in spatial domin becomes a preferred meth-od.However,at present,we do not know the performance of the method .In this article,first,we introduced the principle of implementing the frequency watermark based on DCT in spatial domain ,and then,based on two typical frequency domain watermarking ,we tested the time complexity and PSNR of this two meth-ods which implemented in spatial domain through 800 pictures.The results indicate that the method which implementing the frequency watermarking in spatial domain has a good performance .