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프린지 투영을 이용한 3D 스캐닝에서 신뢰적인 위상 펼침 방법
장성제(Seongje Jang),이건우(Kunwoo Lee) (사)한국CDE학회 2016 한국 CAD/CAM 학회 학술발표회 논문집 Vol.2016 No.동계
A combination of gray-code and phase-shift light projection has been exploited in 3D shape measurements for high reliability. Due to various measurement circumstances and discontinuity of the tested object, however, phase unwrapping algorithm easily yield a bad result with discordance between gray-code pattern boundary and phase-shift pattern boundary. Also, Errors can be introduced into unwrapped phase map which lead to multiples of 2Pi jump. These error tend to make abrupt jumps in unwrapped phase map which has to be monotonous increasing. Stereo matching problem, eventually, becomes more difficult and depth maps, furthermore, must have error. To deal with this boundary discordance problem, an efficient and robust method using region growing algorithm is proposed in this paper. Noises can be removed from gray-code pattern image, which helps the boundary between gray-code pattern image and phase-shift pattern image aligned correcting phase order plus 1 or minus 1. Consequently, the results of experiment confirm that this proposed method based on region growing algorithm can reliably reconstruct a complex object.
3D model을 LEGO 블록으로 설계할 수 있는 자동화 알고리즘
장성제(Seongje Jang),우성경(Sungkyung Woo),감동욱(Dong-Uk Kam),백승엽(Seung-Yeob Baek),이건우(Kunwoo Lee) 대한기계학회 2014 대한기계학회 춘추학술대회 Vol.2014 No.11
We propose a novel approach to convert 3d mesh model into constructable brick layout. To make a 3D object with building blocks such as LEGO bricks, There are 3 restriction needed; constructability, solidity, stability. Constructabilty means building blocks in Lego layout are able to be assembled by basic rules of LEGO kits. Solidity means they are all connected to each other so that they make one solid 3d object. And stability means each block should be firmly interlocked so that the entire model has a certain level of stability. To satisfy these considerations, we employ a graphbased structural anaysis. This approach has a significance to make 3 criteria for converting 3d model to LEGO layout and satisfy them in any case.