• KIPS Transactions on Software and Data Engineering
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• v.6 no.3
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• pp.117-124
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• 2017

To access PDF documents on an electronic book, PDF documents need to be converted into EPUB which is a standard format of the electronic book. When converting a PDF document into EPUB format, we need to convert color representations from CMYK into RGB representation. It is possible to give a visual effect and a user interaction using a video and JavaScript supported by EPUB format. The schemes for converting from PDF to EPUB are studied in this paper. (1) The first study is to carry out not to lose the color conversion effect using an ICC profile. (2) The second one is a layout configuration in the conversion process. (3) The third one is to highlight a specific content such as quiz platform to provide interactive visual effect for electronic book readers. Finally, in this paper we will show the usability of EPUB based eBook converting scheme through user study.

• Annual Conference of KIPS
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• 2015.04a
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• pp.968-970
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• 2015

기존 책 문서인 PDP 문서를 전자책에서도 억세스 할 수 있도록 전자책의 표준 형태로 변환하는 과정이 필요하다. PDP 문서를 전자책의 대표적인 표준 형태인 EPUB3.0으로 변환할 때, 인쇄 색상 표현방법인 CMYK를 디지털 색상 RGB 형태로 변환하는데 형태의 차이로 인하여 색감이 제대로 변환되지 못하는 문제점이 있다. 본 연구에서는 변환 시 색감을 잃지 않도록 ICC 프로파일을 이용한 변환 연구를 수행하였다. 또한 전자책 독자들을 위한 상호 작용적인 시각적인 효과를 제공하기 위하여, 많은 부분의 텍스트 중 특정 부분을 인식하여 효과 코드를 넣는 알고리즘을 제안하였다.

• KSII Transactions on Internet and Information Systems (TIIS)
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• v.15 no.9
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• pp.3421-3443
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• 2021

A data hiding method based on integer factorization via e-books in the EPUB format with XHTML and CSS files for copyright protection is proposed. Firstly, a fixed number m of leading bits in a message are transformed into an integer which is then factorized to yield k results. One of the k factorizations is chosen according to the decimal value of a number n of the subsequent message bits with n being decided as the binary logarithm of k. Next, the chosen factorization, denoted as a × b, is utilized to create a combined use of the

and elements in the XHTML files to embed the m + n message bits by including into the two elements a class selector named according to the value of a as well as a text segment with b characters. The class selector is created by the use of a CSS pseudo-element. The resulting web pages are of no visual difference from the original, achieving a steganographic effect. The security of the embedded message is also considered by randomizing the message bits before they are embedded. Good experimental results and comparisons with exiting methods show the feasibility of the proposed method for copyright protection of e-books.