| Summary: | 碩士 === 國立成功大學 === 工程科學系碩博士班 === 96 === Due to the rapid development of internet and technology,
the transmission of digital content, such as image, audio
and video, is becoming more and more convenient. Hence,
there exists a very important issue for the protection of
intellectual property rights.
Digital watermarking is a novel and developing technology,
it has developed very quickly for the past few years.
A digital watermarking is the information, which is
invisibly embedded in the digital content. Applications
include copyright protection, authentication and tracking.
When making copyright dispute, we can extract the information
from the host data to authenticate the ownership by
watermarking technique.
In this thesis, we proposed a video watermarking system
based on MPEG-2 compressed domain and incorporated block
classification and divide the block into three kinds of
plain、edge and texture, and combine with different block
template. Each watermark bit is hidden by the modification
of the relationship between DCT coefficient pair on texture
block of Intra-frame. The experimental results show that
the proposed watermarking scheme can increase average PSNR
of video about 2~5db and robust against manipulation like
re-encoding, noise added, high pass filtering, low pass
filtering and brightness adjustment.
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