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WANG Hai-feng,REN Hong-e 보안공학연구지원센터 2015 International Journal of Signal Processing, Image Vol.8 No.5
The accurate segmentation and extraction of bamboo cross-section image has a vital role on bamboo processing automation. The Lab color space in accordance with the color features of the bamboo wood cross-section is chosen in this paper. The bamboo cross-section image segmentation and extraction algorithm based on the clustering theory is proposed. The algorithm firstly takes advantage of the character that the colors represented by channel a and channel b of the Lab color space accord with the color of the bamboo wood, to be combined feature vector. Then the algorithm uses the k-mean clustering algorithm to classify the eigenvectors to realize the segmentation of the bamboo wood cross-section. At last the circle fitting algorithm is used to realize the final frame of the bamboo wood cross-section. The results of the experiments show that the algorithm can be used to realize the complete segmentation of the cross-section image of bamboo wood, and to frame the results correctly, the time performance of which can meet the requirements of the subsequent processing.
Excitation of Resistive States in Superconducting Films by Using Electrical and Light Pulses
Jean-Paul Maneval,Fran cois-Ren e Ladan,J.C. Villegier,Vu Dinh Lam,Phan Hong Khoi 한국물리학회 2008 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.52 No.5
The resistance induced by nanosecond pulses of electric currrent or of light has been studied in superconducting Nb and NbN thin lms. Narrow bridges exhibit the features expected from quasi-1D transport, namely, localized phase-slip centers (PSC) and hot spots (HS), depending upon the prescribed conditions of temperature and applied current. PSC and HS are clearly identied from their characteristic delay and their evolution in time. We then analyze the response to combined pulsed illumination and current. Using very thin (4 nm) niobium-nitride lms, it was possible to detect the visible light delivered photon by photon. The resistance induced by nanosecond pulses of electric currrent or of light has been studied in superconducting Nb and NbN thin lms. Narrow bridges exhibit the features expected from quasi-1D transport, namely, localized phase-slip centers (PSC) and hot spots (HS), depending upon the prescribed conditions of temperature and applied current. PSC and HS are clearly identied from their characteristic delay and their evolution in time. We then analyze the response to combined pulsed illumination and current. Using very thin (4 nm) niobium-nitride lms, it was possible to detect the visible light delivered photon by photon.