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Obtaining 1-pixel Width Line Using an Enhanced Parallel Thinning Algorithm
권준식(Jun-Sik Kwon) 대한전자공학회 2009 電子工學會論文誌-SP (Signal processing) Vol.46 No.1
세선화 알고리즘은 문자인식, 도형 및 도면 인식 등에 매우 중요하게 사용되고 있다. 세선화 알고리즘은 여러 가지 방법으로 제안되어 왔다. 본 논문에서는 이전에 제안된 세선화 알고리즘 중 선처리가 후처리에 영향을 주지 않는 병렬 세선화 알고리즘 중에서 ZS, LW, 및 WHF 알고리즘의 문제점을 찾아내었다. ZS 알고리즘은 사선 방향에서 화소가 손실되는 문제점을 안고 있으며, LW 알고리즘은 사선 방향에서의 화소 두께가 1이 되지 못하는 문제점을 내포하고 있다. 따라서 본 알고리즘에서는 사선 방향에서 8근방을 이루며, 화소의 두께도 완전히 1이 되도록 개선시킨 병렬 세선화 알고리즘을 제안한다. A Thinning algorithm is a very important factor in order to recognize the character, figure, and drawing. Until comparatively lately, the thinning algorithm was proposed by various methods. In this paper, we ascertain the point at issue of ZS(Zhang and Suen), LW(Lu and Wang) and WHF(Wang, Hui and Fleming) algorithms that are the parallel thinning algorithms. The parallel thinning algorithm means the first processing doesn't have to influence to the second processing. ZS algorithm has a problem which loses pixels in slanting lines and LW algorithm doesn't have one pixel width in slanting lines. So I propose an advanced parallel thinning algorithm that connects the pixels each other and preserve the end point.
류주현,이유형,김도형,이일하,권준식,백동수,Yoo, Ju-Hyun,Lee, Yu-Hyong,Kim, Do-Hyung,Lee, Il-Ha,Kwon, Jun-Sik,Paik, Dong-Soo 한국전기전자재료학회 2008 전기전자재료학회논문지 Vol.21 No.2
In this study, in order to develop low loss multilayer piezoelectric actuator, PZN-PZT ceramics were fabricated using $Li_2CO_3,\;Bi_2O_3$, CuO and ZnO as sintering aids, their structural, piezoelectric and dielectric characteristics were investigated according to the amount of ZnO addition, At the sintering temperature of $870^{\circ}C$, the density, electromechanical coupling factor(kp), mechanical quality factor(Qm), dielectric constant(${\epsilon}_r$) and piezoelectric constant($d_{33}$) of 0.4 wt% ZnO added specimen (sintered at $870^{\circ}C$) showed the optimum value of $7.812g/cm^3$, 0.535, 916, 1399, 335 pC/N respectively. Taking into consideration above piezoelectric properties of the specimen sintered at low temperature, it was concluded that PZN-PZT ceramics using 0.4 wt% ZnO as additive showed the optimum characteristics as the composition ceramics for low loss multilayer piezoelectric actuator application.