A novel algorithm of spatial scalability for scrambled video

Author

Zou, Yuanzhi ; Gao, Wen

Author_Institution

Inst. of Comput. Technol., Chinese Acad. of Sci., Beijing, China

fYear

2005

fDate

23-26 May 2005

Firstpage

3427

Abstract

Although much research have investigated transparent scrambling video techniques, an issue of which transcoding relates to downsizing scrambled video without unscrambling has hardly been solved in single-layer MPEG-2 coded video content. In the paper, a novel algorithm based on approximation for compressed domain linear operation and using a mix of linear transformation of coefficient values in DCT for scrambling video is proposed for downsizing the scrambled video by a factor of two. Experimental results show that the proposed algorithm can reduce computational complexity and efficiently degrade video quality. Compared to the existing scrambling video methods, this algorithm not only can scramble video that is compliant to block-coded format but also can realize downsizing the scrambled video in the compressed domain by a factor of two without unscrambling and impact on the performance of the compression.

Keywords

code standards; data compression; discrete cosine transforms; transcoding; video coding; DCT; approximation; coefficient values; compressed domain linear operation; downsizing; linear transformation; scrambled video; single-layer MPEG-2 coded video; spatial scalability; transcoding; Approximation algorithms; Computers; Cryptography; Discrete cosine transforms; High definition video; Scalability; Streaming media; Transcoding; Transform coding; Video compression;

fLanguage

English

Publisher

ieee

Conference_Titel

Circuits and Systems, 2005. ISCAS 2005. IEEE International Symposium on

Print_ISBN

0-7803-8834-8

Type

conf

DOI

10.1109/ISCAS.2005.1465365

Filename

1465365