제 목 The visibility of the moiré patterns

강 사 Vladimir V. Saveljev

소 속 KIST

시 간 2014년 12월 4일 (목요일) 오전 11시

장 소 제1신공학관 301동 203호

Abstract

The moiré effect sometimes take place in visual displays (TV, computer screen, digital photos). In that case, it may essentially (and unexpectedly, at the first look) reduce the visual quality of the image. This is essential for the autostereoscopic 3D displays, where an LCD panel is typically used in combination with a lenticular of a barrier plate. The periodicity of the screen pixels and lenticules makes rise of the moiré patterns. The moiré patterns form the striped background image which is effectively added to any displayed image, and the visual contrast of a useful image is reduced. The image quality is the main reason for minimization of the moiré effect.

On the other hand, it is not impossible to make measurements or to display images using the moiré effect. In these cases, we need maximizing the moiré patterns themselves.

Important design parameters of the autostereoscopic 3D displays are the angle of the lenticular lens (lens array), the ratio between the sizes of the microlens and the screen pixel (cell-to-pixel ratio), as well as the opening ratio of the cells which affects the brightness. Therefore, it is important to know the visibility of the moiré patterns under various conditions.

In the previous research, a “binary” approach was mostly used, when the moiré patterns were treated as either visible or invisible. This makes sense for minimization, but for other applications, like imaging, a more detailed estimation is needed.

The presentation covers the published papers related to the visibility of the moiré effect, as well as the research in progress.

Biography

Vladimir V. Saveljev is a research scientist at the Imaging Media Research Center, KIST, Korea. Previously, he was with Institute of Automation and Electrometry, Siberian Branch of the Russian Academy of Sciences, Novosibirsk, Russia until 2000 and with the Hanyang University, Korea until 2010. The topics of his research interest are the autostereoscopic multiview/integral imaging (3D displays, projective model, image quality, and reference functions) and the moiré effect (minimization and displays). He is author and coauthor of more than 100 publications including book chapters.