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      • KCI등재후보

        PCA 및 BP 알고리즘을 이용한 손동작 인식

        황문구(Moon-Gu Hwang),김형래(Hyoung-Rae Kim),강석범(Suk-Bum Kang),양태규(Tae-Kyu Yang) 한국정보기술학회 2007 한국정보기술학회논문지 Vol.5 No.3

        본 논문에서 손동작 인식은 PCA 알고리즘을 이용한 전처리 단계와 BP 알고리즘을 이용한 분류의 두 단계로 구성한다. PCA 알고리즘은 데이터 분석을 위해 다차원 데이터 집합을 보다 낮은 차원으로 감소시키기 위해 사용되는 기술로 주어진 손의 특징인 투영 벡터를 계산하기 위하여 적용되었고, BP 알고리즘은 병렬구조를 가지고 있으므로 병렬 분산처리가 가능하고, 처리 속도가 빠르므로 PCA로부터 훈련된 고유손을 학습시켜 손동작을 실시간으로 인식한다. 본 논문에서는 세 종류의 손동작을 여러 방향으로 저장 한 후 훈련수를 증가시키면서 PCA 알고리즘만을 사용한 경우와 본 논문에서 제안한 PCA 및 BP 알고리즘을 사용한 경우의 인식률을 비교하여 제안한 알고리즘이 우수함을 보였다. Recognition of hand gestures consists of two steps which are preprocessing step using PCA algorithm and classification step using BP algorithm. The PCA algorithm is a technique used to reduce multidimensional data sets to lower dimensions for effective analysis. In our simulation, the PCA is applied to calculate feature projection vectors for the image of a given hand. The BP algorithm is capable of doing parallel distributed processing and expedite processing since it take parallel structure. The BP algorithm recognized in real time hand gestures by self learning of trained eigen hands. The proposed PCA and BP algorithm show improvement on the recognition compared to PCA algorithm.

      • KCI등재후보

        퍼지 추론을 이용한 비전 기반 실시간 손모양 인식

        황문구(Moon-Gu Hwang),김형래(Hyoung-Rae Kim),강석범(Suk-Bum Kang),양태규(Tae-Kyu Yang) 한국정보기술학회 2008 한국정보기술학회논문지 Vol.6 No.2

        본 논문은 퍼지 추론을 이용한 비전 기반 실시간 손모양 인식 방법을 제안하였다. 카메라로부터 입력받은 RGB 컬러모델을 조명변화에 강인한 YCbCr 컬러모델로 변환하여 휘도 성분을 제외한 색차 성분만으로 피부색을 검출하여 피부색은 흰색으로 그 외의 색은 검은색으로 이진화하였다. 이진화된 흰색 영역은 손 영역만이 아닌 팔 영역이 포함될 수 있으므로 정확한 손 영역을 검출하기 위해서 팔 영역을 제거하여야 한다. 본 논문에서는 이진영상의 무게중심좌표와 외접사각형중심좌표의 차를 퍼지 제어의 입력으로 하는 퍼지논리제어시스템을 사용하여 팔 영역을 제거하고 손 영역만을 검출하였다. 손 영역 검출 후 무게중심으로 하는 원을 그려 그 원에 걸치는 손가락 개수를 세어 손모양을 인식하였다. 실험을 통하여 제안한 알고리즘의 효과를 입증하였다. In this paper we proposed a new real time based gesture recognition method based on vision technology using fuzzy inference. Transforming the acquired image from camera into color model which is robust to the change of lighting and illumination, detecting skin color only by a few colors except brightness components and then altering skin area component into a white color and the other component into a black color by binirization process. To detect a correct skin area, a process of eliminating the arm part should be added because the binarized white area can include unnecessary arm part area. We have succeeded in detecting a robust and exact hand area for hand gesture recognition. For this, we have used the fuzzy logic inference engine which has an input of difference value between the center of area of binary image and the center of a circumscribed rectangle. After detecting a hand area, a circle which has the center of area in skin component area is made for counting the intersection points between the circle and the gestured finger line. We demonstrated the effectiveness of our algorithm by some experiments.

      • 彈性 表面波 필터의 等價回路에 關한 硏究

        黃文龜 大田開放大學 1987 論文集 Vol.6 No.-

        In this paper, the transmission and reception characteristics are studied for SAW Filters of the IDT electrode form. The device equivalent circuit is structured by the electrically equivalent circuit with the "In line field model" and "Cross field model". Linear network models are used to represent the IDT as a chain of identical three-ports which are acoustically in cascade but electrically in parallel. The network model emphasizes a series connection for the two acoustic loads while utilizing lumped impedance elements expressed as functions of the delay operator. An exact analysis of the plate dynamics permits a simplified resistive model for conditions of light asymmetry in acoustic leading. A simplified resistive structure provides transmission and reception loss near the half wave resonance. Finally, RLC lumped component models are provided for evaluation of IDT as lumped element SAW Filters. Low values of acoustic reflection loss are predicted theoretically and observed experimentally when the electric load and transducer capacitance are in resonance.

      • 等價回路 모델을 이용한 SAWF의 動作特性에 關한 硏究

        黃文龜 大田産業大學校 1994 한밭대학교 논문집 Vol.11 No.0101

        The operation characteristics are studied for the surface acoustic wave filter of the interdigital electrode form. The essential 3-port characteristics of the interdigital transduducer have been described by linear equivalent circuits based on approximate one-dimensional models. Linear network models are used to represent the transducer as a chain of indentical 3-port which are acoustically in cascade but electrically in parallel. Two criteria have been presented to determine which of the "crossed field" or "in line field" model is more appropriate for a specific piezoelectric configuration. Predominance of the normal field term indicates that the "crossed field" model is the more suitable of the two models. Conversely, the "in line field" model is selected when the parallel field term is largest. Transducer operation at acoustic synchronism is described theoretically and compared to current experimental data for transducers operating at 100MHz and fabricated on lithium niobate. Low values of acoustic reflection loss are predicated theoretically and observed experimentally when the electric load and transducer capacitance are in resonance. The frequency dependence of transducer radiation immittance is studied, and the response is found to be analogous to the response of an endfire antenna array.

      • 낙뢰서지에 대한 電子交換機 保護回路에 關한 硏究

        박동훈,黃文龜 大田産業大學校 1994 한밭대학교 논문집 Vol.11 No.0101

        This paper describes the stepped protection circuit to protect SLIC against overvoltage or overcurrent which occur on the subscriber line due to lightning surges. The primary protection circuit is combined with the overvoltage function of the BORSCHT circuit, which is one of basic functions of the SLIC, and a gas tube arrester set In the MDF. The stepped protector consists of a gas tube arrester, a PTC thermistor, a ZNR varistor and multistory thyristor and we has achieved protection effects with more improved results lightning surges.

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