Browsing by Author "Yang, Wen-Chao"

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A NEW STEGANOGRAPHY METHOD VIA VARIOUS ANIMATION TIMING EFFECTS IN POWERPOINT FILES
(2009)
Jing, Min-Quan
;
Yang, Wen-Chao
;
Chen, Ling-Hwei
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資訊工程學系
;
Department of Computer Science
In this paper, a new steganography method that hides message via various animation timing effects in a PowerPoint file is proposed. The animation effects are designed for the presenter to emphasis the key points, control the flow or enrich the interesting in presentation. Then the animation timing effect is the speed, time and repeat control part of animation effect. It is worth mentioning that adding animation effects does not change any content of the slides in the PowerPoint file. In contrast to other steganography methods, using various animation effects to hide message not only livens up on-screen presentations, but also keeps the real content of the PowerPoint file intact.
A novel steganography method via various animation effects in powerpoint files
(2008)
Yang, Wen-Chao
;
Chen, Ling-Hwei
;
資訊工程學系
;
Department of Computer Science
In this paper, a novel steganography method that hides message via various animation effects in a PowerPoint rile is proposed. The animation effects are designed for the presenter to emphasis the key points, control the flow or enrich the interesting in presentation. It is worth mentioning that adding animation effects does not change any content of the slides in the PowerPoint file. In contrast to other steganography methods, using various animation effects to hide message not only livens up on-screen presentations, but also keeps the real content of the PowerPoint rile intact.
A steganographic method via various animations in PowerPoint files
(2015-02-01)
Yang, Wen-Chao
;
Chen, Ling-Hwei
;
資訊工程學系
;
Department of Computer Science
In a PowerPoint file, animation effects are used to emphasize objects, timing effects are used to control the presentation time, and slide transition effects are used to highlight particular slides. Thus, using various effects can make the presentation of a PowerPoint file more colorful and attractive. In this paper, we propose a steganographic method to embed message in a PowerPoint file via various effects. In contrast to other steganographic methods, we not only hide message naturally but also keep the content of the cover media intact. Furthermore, the proposed method can resist the format conversion attack. The experiment result demonstrates that the proposed method is undetectable under some visual and statistical attacks.
Reversible DCT-based data hiding in stereo images
(2015-09-01)
Yang, Wen-Chao
;
Chen, Ling-Hwei
;
資訊工程學系
;
Department of Computer Science
Stereo images captured from a pair of CCDs simultaneously are widely used to create the illusion of 3D depth. Each pair of stereo images has many similar block pairs. In this paper, a novel reversible data hiding method is proposed to embed secret data in these similar block pairs. To increase the embedding capacity, each 3-bit secret data is first converted to a pair of integers. Then, similar block pairs are found based on the lower frequency DCT-quantized coefficients. Each converted integer is embedded via the difference of a pair of middle frequency DCT-quantized coefficients from these similar block pairs. It is worth mentioning that the proposed method is reversible, but the existing data hiding methods for stereo images are irreversible. Experimental results show that the proposed method is undetectable under Chi-square analysis, and it provides high embedding capacity while maintaining acceptable quality of stereo images higher than 30 dB. The experimental results also show that the proposed method outperforms Chang et al.\'s method and Lin and Shiu\'s method in embedding capacity and image quality.