Image Coding and Watermarking Using Block Truncation Coding and Holography
Date Issued
2011
Date
2011
Author(s)
Yu, Chih-Jung
Abstract
With the advancement of computers and the Internet, multimedia contents are very popular and easy to obtain. However, it often requires a large amount of memory storage to record the complex information contains in these multimedia contents. Thus, transmitting uncompressed digital media through the internet may be impractical. Block truncation coding (BTC) is a simple and efficient compression technology. However, the annoying blocking effect and false contour accompanied in high coding gain limit the application when compares to some modern compression technique. In order to improve the image quality, some halftoning techniques is combined with the BTC. In this study, we modify the schemes of two existing compression techniques which were based on BTC, and try to enhance the image quality.
In addition, the surge of digital media is also creating a pressing need for copyright protection and content authentication. To avoid counterfeiting or unauthorized docu-ments being used, we could hide a set of auxiliary data, called digital watermark, into the original content. One of the watermarking techniques can be achieved by holography. While traditional holography is mostly obtained by optical interferometric equipments that require excessive setups, calibrations, and additional recording materials, the computer-generated holography is readily accomplished by computer manipulation. Hence, in this thesis, we also discussed several watermark embedding technique based on computer-generated holographic approach.
Subjects
Halftoning
Block Truncation Coding
Digital Watermarking
Digital Holography
Type
thesis
File(s)![Thumbnail Image]()
Loading...
Name
ntu-100-R98942058-1.pdf
Size
23.32 KB
Format
Adobe PDF
Checksum
(MD5):d1bea1c8d59018957c011173c9421b2b