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측광입체시법을 이용한 하이라이트 검출과 농담 차이를 이용한 물체 복원
배철민(Bae Chul Min),문영식(Moon Young Shik) 한국정보처리학회 1997 정보처리학회논문지 Vol.4 No.4
In many vision tasks one of the major obstacles is the specular highlight of smooth objects, which causes a misinterpretation of objects.This paper presents an efficient algorithm for highlight detection and object reconstruction, based on the theory of photometric stereo in which the location of highlight changes as the position of illumination source changes. Two images, referred to as base image and reference image, are sequentially taken with two different positions of the illumination source but from the same viewing direction. The reference image is normalized by the average of the two images. The difference image is thresholded to detect the specular spike of the highlight. Then the specular lobe around the specular spike is detected to reconstruct the object. The proposed algorithm can be applied to metals and dielectrics, regardless of the surface characteristics. This method can also be applied to the case when the background is brighter than the object.
측광입체시법을 이용한 하이라이트 검출과 농담차이를 이용한 물체 복원
배철민(Chul-Min Bae),문영식(Young-Shik Moon) 한국정보과학회 1995 한국정보과학회 학술발표논문집 Vol.22 No.1
In many vision tasks one of the major obstacles is the specular highlight of smooth objects, which causes a misinterpretation of objects. The thesis presents an efficient algorithm for highlight detection and object reconstruction, based on the theory of photometric stereo in which th location of highlight changes as the position of illumination source changes. Two images, referred to as base image and reference image, are sequentially taken with two different position of the illumination source but from the same viewing detection. The reference image is normalized by the average of the two images. The difference image is thresholded to detect the specular spike is detected to reconstruct the object. The proposed algorithm can be applied to metals and dielectrics, regardless of the characteristics. This method can also be applied to the case when the background is brighter than the object.
비원형 신선을 이용한 고강도-고연성 펄라이트 강선의 제조
백현무(Hyun Moo Baek),황선광(Sun Kwang Hwang),주호선(Ho Seon Joo),임용택(Yong-Taek Im),손일헌(Il-Heon Son),배철민(Chul Min Bae) 대한기계학회 2014 大韓機械學會論文集A Vol.38 No.7
본 연구에서는 고강도-고연성 펄라이트 강선을 제조하기 위하여 비원형 신선 공정을 적용하였다. 다단 비원형 신선 공정을 A와 B로 정의한 2 종류의 가공경로를 이용하여 상온에서 12 패스까지 수행하였다. 비원형 신선 공정과의 비교를 위해서 기존의 원형 신선 공정을 수행하고 기계적 특성과 집합조직발달에 대해 비교를 수행하였다. 원형 신선 공정으로 제조된 강선은 10 패스에서부터 박리파괴가 관찰되었지만, 비원형 신선 가공경로 B의 경우는 12 패스에서도 박리파괴가 발생하지 않았으며, 이는 X-선회절로부터 측정된 집합조직 결과에서 원형집합조직의 발달이 적은 것과 연관된다. 따라서, 다단 비원형 신선 공정을 통하여 기존의 신선 공정보다 박리파괴의 발생 가능성을 저감시킴으로써 높은 비틀림 연성을 갖는 고강도 펄라이트 강선을 제조할 수 있음을 확인할 수 있었다. In this study, a noncircular drawing (NCD) sequence for manufacturing high-strength and high-ductility pearlitic steel wires was investigated. Multipass NCD was conducted up to the 12th pass at room temperature with two processing routes (defined as the NCDA and NCDB), and compared with the wire drawing (WD). During the torsion test, delamination fracture in the drawn wire was observed in the 10th pass of the WD whereas it was not observed until the 12th pass of the NCDB. From X-ray diffraction, the circular texture component that increases the likelihood of delamination fracture of the drawn wire was rarely observed in the NCDB. Thus, the improved ability of the multipass NCDB to manufacture high-strength pearlitic steel wires with high torsional ductility compared to the WD (by reducing the likelihood of delamination fracture) was demonstrated.
주호선(Ho Seon Joo),황선광(Sun Kwang Hwang),백현무(Hyun Moo Baek),임용택(Yong-Taek Im),손일헌(Il-Heon Son),배철민(Chul Min Bae) 대한기계학회 2013 대한기계학회 춘추학술대회 Vol.2013 No.12
In the present study, a non-circular drawing (NCD) sequence was investigated for manufacturing medium carbon steel wires in which spheroidization of cementite was improved. The NCD was applied up to four passes and compared with the wire drawing (WD) process. According to the present investigation, the wires, subject to subcritical annealing following the NCD, showed the reduced ultimate tensile strength and the enhanced reduction of area compared to those for the WD process. Scanning electron microscopy was employed to investigate the underlying mechanism for such phenomena by observing the microstructure changes during the spheroidization annealing. It was found that the spheroidization of cementite was more likely to be accelerated by the NCD.