Liu Yichen, an undergraduate student from the Department of Physics and Chemistry (DPC), Faculty of Science and Technology (FST), University of Macau (UM), and a research team led by his supervisor, Liu Hongchao, assistant professor in the FST, recently published a paper titled ‘Anti-loss-compression Image Encryption Based on Computational Ghost Imaging Using Discrete Cosine Transform and Orthogonal Patterns’ in Optics Express, a top journal in the research field of optics.
In his paper, Liu proposed a method to compress the bucket signals and illumination patterns of computational ghost imaging. This anti-loss-compression method can greatly reduce the amount of cipher text and keys and meanwhile enhance the security of the optical encryption scheme based on computational ghost imaging. This is the first time that an undergraduate student from the DPC has published a paper in an SCI-indexed journal as the first author.
As a key feature of the undergraduate programmes offered by the DPC, project-based learning plays an important role in the learning of students outside the classroom. Students have the opportunity to join research groups led by UM professors to explore scientific research during their first year of studies. This research based learning mode not only enables students to develop their scientific thinking skills, analytical skills, and problem-solving skills, but also allows them to deepen their understanding of theoretical knowledge and cultivate their sense and ability in scientific research. Liu joined Prof Liu’s research group in his first year of studies with a research focus on ghost imaging and single-pixel imaging.
In addition, Liu published another paper titled ‘Single-Pixel Imaging and Metasurface Imaging’ in the journal Infrared and Laser Engineering as a co-author in 2021. The paper discusses the latest developments of single-pixel imaging and ghost imaging in China and abroad.
The full version of the paper ‘Anti-loss-compression Image Encryption Based on Computational Ghost Imaging Using Discrete Cosine Transform and Orthogonal Patterns’ can be viewed at https://opg.optica.org/oe/fulltext.cfm?uri=oe-30-9-14073&id=471300.
The full version of the paper ‘Single-Pixel Imaging and Metasurface Imaging’ can be viewed at http://www.irla.cn/cn/article/doi/10.3788/IRLA20211058.
澳門大學科技學院物理及化學系本科生劉亦辰與其導師劉宏超在應用物理及材料工程研究院的研究團隊，提出了一種用於壓縮計算鬼成像的探測信號和照明圖案的方案，可提高圖像信號加密的安全度，獲光學類頂級期刊《光學快訊》刊登。
澳大物理及化學系本科課程的主要特色以“專題研習”的學習方式為主，在學生的課外學習中扮演著重要的角色。學生從大一開始加入教授的研究課題組進行科研學習和探索。這種以研促學的模式不但使學生科學思維、分析和解決問題的能力得到很好的鍛煉，同時讓學生從中加深對理論知識的理解，培養其科研觸覺和能力。劉亦辰在大一時加入了澳大科技學院助理教授劉宏超的研究課題組，研究鬼成像與單像素成像。
是次發表於《光學快訊》的論文《基於使用離散余弦變換和正交掩模的鬼成像的圖像加密》（Anti-loss-compression image encryption based on computational ghost imaging using discrete cosine transform and orthogonal patterns）中，劉亦辰提出了一種用於壓縮計算鬼成像的探測信號和照明圖案的方案。這種可抗信號損失的壓縮方案極大減少了基於計算鬼成像的光學加密中的密鑰和密文數據量，同時提高了加密安全度。這是澳大物理及化學系首次有本科學生以第一作者身份在SCI類刊物發表學術論文。
此外，劉亦辰亦以合作作者身份於2021年在核心期刊《紅外與激光工程》上發表了題為《單像素成像與超表面成像》的論文。研究分析總結了近期國內外在單像素成像技術與鬼成像技術上的最新進展。。
《基於使用離散余弦變換和正交掩模的鬼成像的圖像加密》全文可瀏覽： https://opg.optica.org/oe/fulltext.cfm?uri=oe-30-9-14073&id=471300
《單像素成像與超表面成像》全文可瀏覽：http://www.irla.cn/cn/article/doi/10.3788/IRLA20211058
Liu Yichen (left) and Liu Hongchao
劉亦辰（左）及劉宏超
Paper has been published on Optics Express
成果獲刊登在頂級期刊《光學快訊》