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Advances on digital video and visual...

Zhou, Zhi.

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Advances on digital video and visual cryptography.

紀錄類型:	書目-電子資源 : Monograph/item
正題名/作者:	Advances on digital video and visual cryptography./
作者:	Zhou, Zhi.
面頁冊數:	101 p.
附註:	Source: Dissertation Abstracts International, Volume: 65-08, Section: B, page: 4212.
Contained By:	Dissertation Abstracts International65-08B.
標題:	Engineering, Electronics and Electrical. -
電子資源:	http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=3144826
ISBN:	0496030752

Advances on digital video and visual cryptography.
Zhou, Zhi.

Advances on digital video and visual cryptography. - 101 p.

Source: Dissertation Abstracts International, Volume: 65-08, Section: B, page: 4212.

Thesis (Ph.D.)--University of Delaware, 2004.

In this dissertation, advances on two categories of image and video signal processing are developed. In particular, the focus is on frame rate conversion and halftone visual cryptography.

ISBN: 0496030752Subjects--Topical Terms:

626636
Engineering, Electronics and Electrical.

Advances on digital video and visual cryptography.
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520 $a In this dissertation, advances on two categories of image and video signal processing are developed. In particular, the focus is on frame rate conversion and halftone visual cryptography.
520 $a Frame rate conversion. Various video systems are available worldwide with different temporal resolutions, such as NTSC, 60Hz TV system used in North America, and PAL, 50Hz TV system used in Europe and China. Frame rate conversion is required to transform videos from one system to another. Currently, the most common method used in industry is the so called "3:2 pull down," which converts 24 frames/sec progressive film to 29.97 frames/sec interlaced NTSC video. This method introduces several artifacts, while numerous motion compensated methods have been proposed recently to mitigate such artifacts. Those methods are either too expensive or still not effective to be applied into real products. In this dissertation, novel algorithms of frame rate conversion, using symmetric/pixel-based multi-resolution motion estimation techniques, are proposed. Based on the multi-resolution structure of fields/frames, the methods efficiently search for accurate motion vectors, leading to high quality of interpolated results. The hardware cost is affordable in current TV technology.
520 $a Halftone visual cryptography. Visual cryptography encodes a secret binary image SI into n shares (images containing partial secret information) of random binary patterns. If the shares are xeroxed onto transparencies, the secret image can be visually decoded by superimposing a qualified subset of transparencies, but no secret information can be obtained from the superposition of a forbidden subset. Such a scheme is mathematically secure, however, the binary patterns of the n shares have no visual meaning, raising the suspicion of data encryption. In order to achieve a higher level of security, a novel technique, halftone visual cryptography, is proposed in this dissertation, where a secret binary image is encoded into n halftone shares (images) carrying significant visual information. Thus, adversaries are less likely to suspect the presence of hidden cryptographic information. The proposed methods utilize blue-noise dithering principles to construct halftone shares with visually pleasing attributes, while the security properties of conventional visual cryptography are still maintained.
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