@incollection{, 382B55C18A4791CCEE907796CFC7C42B , author={{KoheiInoue} and {WenyiCui} and {KenjiHara} and {Kyushu University}}, journal={{Global Journal of Computer Science and Technology}}, journal={{GJCST}}0975-41720975-435010.34257/gjcst, address={Cambridge, United States}, publisher={Global Journals Organisation}21115 } @book{b0, , title={{Ambigram -Wikipedia, the free encyclopedia}} , author={{ Wikipedia }} , note={Online; accessed 06-March-2020} } @book{b1, , title={{Ambigrams, logos, & word art}} , author={{ JohnLangdon }} ac- cessed 07 , year={1996. February-2019} } @book{b2, , title={{Wordplay: The Philosophy, Art, and Science of Ambigrams}} , author={{ JLangdon }} , year={2005} , address={Bantam} } @book{b3, , title={{GIF -Wikipedia, the free encyclopedia}} , author={{ Wikipedia }} , note={Online; accessed 06-March-2020} } @book{b4, , author={{ LDaniel } and { GonzaloRLau } and { Arce }} , title={{Modern Digital Halftoning}} Boca Ra-ton, FL, USA , publisher={CRC Press, Inc} , year={2007} , note={Second Edition} } @incollection{b5, , title={{Man-agement of the standard image database for image pro-cessing researches (sidba)}} , author={{ MSakauchi } and { YOhsawa } and { MSone } and { MOnoe }} , journal={{ITEJ Technical Report}} 8 38 , year={1984} } @incollection{b6, , title={{An Adaptive Al-gorithm for Spatial Greyscale}} , author={{ RobertWFloyd } and { LouisSteinberg }} , booktitle={{Proceedings of the So-ciety for Information Display}} the So-ciety for Information Display , year={1976} 17 } @incollection{b7, , title={{Robust real-time object detection}} , author={{ PaulViola } and { MichaelJones }} , journal={{International Journal of Computer Vision}} 57 2 , year={2002} } @book{b8, , title={{Signal-to-noise ratio -Wikipedia, the free encyclopedia}} , author={{ Wikipedia }} , year={2020} , note={Online; accessed 06-March-2020} } @book{b9, , title={{Original images (b) GIF images (c) Ambigramic images without ED}} } @incollection{b10, , title={{}} , journal={{Ambigramic images by Algorithm}} 1 }