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장종국,권기룡,안상호,송규익,이건일 대한전자공학회 1996 전자공학회논문지-B Vol.b33 No.4
A compensation method of color error resulting from dynamic range transformation of color image is propsoed. The color error is measured using the CIE L a b uniform color space, and the color image is compensated to minimize it. The color error is significant in the dark region of image, which is caused by the lunimance scaling factor is relatively large in that case. In the proposed method, we weight the luminance scaling factor corresponding to luminnce to minimize the error. Because the weighting factor depends on luminace distribution of image, a decisio method of weighting factor using histogram is also proposed.
蔣鐘國,金德奎 경북대학교 공과대학 1984 工大硏究誌 Vol.13 No.-
Software-based speed control system for dc servo motor was designed. The designed system was consisted of a personal computer as a host computer, microprocessor based motor controller, and power drive circuit. System designed fully digital scheme used variable period PWM signal for wide speed control range of dc serve motor. Experimental result of the designed system showed that speed control range could be extended to 8% of duty ratio for the controlling PWM signal.
장종국 永同大學校 1999 硏究論叢 Vol.5 No.1
본 논문에서는 화상의 휘도 변환시 일어날 수 있는 색 오차를 판단하고 이를 보정하는 방법을 제시하였다. 본 논문에서는 균일 색 공간 좌표계인 CIE L^*a^*b^*를 이용하여 색 오차를 측정하고 이의 오차를 최소화하였다. XYZ 색공간을 이용하는 기존의 방법에서는 화상의 어두운 부분에서 색 오차가 크게 나타났다. 제안한 방법에서 는 스케일링 팩터를 가중하여 색 오차를 최소화시켰다. 실험 결과를 통해서 이 방법의 타당을 증명하였다. A color error measurement method and color compensation are proposed in this paper. I measured color error using the CIE L^*a^*b^* uniform color space, and color image is compensated to minimize it. In conventional color compensation method using the XYZ color space, color error is significant in dark region of image, which is caused by the luminance scaling factor is relatively large in that case. The proposed method, 1 weighted the luminance scaling factor corresponding to luminance to minimize the error Because the weighting factor depends on luminance distribution of image. The result of the experiment shows that the proposed method reduces the color error to approximately 1/3 of that of Rodriguez's.
장종국 김천대학교 1993 김천대학교 논문집 Vol.14 No.-
In this paper, I propose a textbook for a basic electronic laboratory course. This textbook contains various experiment of electric circuit theory.
장종국,김건엽,안상호,이건일 대한전자공학회 1995 전자공학회논문지-B Vol.b32 No.9
In video camera, an automatic video quality compensation method using the dynamic range transform is proposed. The histogram is used to decide the nonuniformness of picture brightness by nonuniform lighting. The gray level is divided four regions, and the histogram is obtained per one field. We introduce a new parameter, nonuniformness, defined by the cumulative difference between its CDF and LCDF. We also propose the decision function of the dynamic range transform constant versus its nonuniformness, and compensate the quality of video automatically.
누적분포함수를 이용한 영상의 밝기 측정 및 이를 이용한 화질의 자동보상
장종국 김천대학교 1994 김천대학교 논문집 Vol.15 No.-
In this paper, I proposed the cumulative distribution function of brightness of an televis-ion image and video camera, and define a new measure, FLATNESS to achive brightness distribution of an image. I devide the brightness distribution of an image into three catego-ries. In each case, the nonuniformness of an image is calculated by the difference between cumulative distribution function and the linear cumulative distribution. Using this parameter, the nonlinerity is used for dynamic range transform coefficient. The dynamic range conve-rsion is achived using the transformation coefficient. As a result, the brightness distribution and picture quality compensation are worked well in any conditions.
신용달,장종국 永同工科大學校 1996 硏究論叢 Vol.2 No.1
본 논문에서는 프랙탈 부호화를 효율적으로 수행하기 위해서 기존의 Jacquin방법에서 사용한 Ramamurthi와 Gersho의 분류 방법인 경사도. (gradient) 대신에 블럭의 분산값을 근사화된 JND로써 정규화한 JND(Just Noticeable Difference) 분류기(classifier)를 이용한 프랙탈 영상 부호화 방법을 제안하였다. 제안한 프랙탈 부호화에서는 인간 시각의 특성에 적절히 부합되도록 하기위하여 JND 분류기를 이용하여 영상을 둔감한 블럭, 중간 블럭, 민감한 블럭으로 분류한 후 각각의 블록 특성에 따라 적응적으로 프랙탈 부호화를 수행하였다. 제안한 프랙탈 부호화 방법의 타당성을 확인하기 위하여 512×512 크기의 LENA 영상에 모의실험한 결과 0.37 bits/pel에서 기존의 Jacquin 방법에 비해 인간 시각적 특성에서 민감한 영역에서 블럭화 현상이 많이 줄어서 화질이 향상 되었다. We presented a classifier replaced Jacquin's classifier by normalized variance of the blocks by JND visual effect to reduce blocking effect. The classifier classify blocks into one of three classes such as low activity blocks, medium activity blocks, and high activity blocks. Experiments show that the presented fractal image coding reduced blocking effect at 0.37 bits/pel, also the PSNR impreoved 0.17 dB for LENA (512×512×8bpp) image.
영상의 생동도(dynamic range)변환을 이용한 비디오카메라의 자동 노출조정 및 영상의 자동 화질보상
장종국 ; 장성식 김천대학교 1995 김천대학교 논문집 Vol.16 No.-
In video camera, an automatic video quality compensation method using dynamic range transform is proposed. The histogram is used to decide the non-uniformness of picture brightness caused by nonuniform lighting. The gray level is divied four regions, and the histogram is obtained per one field of video signal. We introduce a new parameter, nonuniformness, defined by the cumulative differ-ence bettween its CDF and LCDF. We also propose a decision func-tion of the dynamic range transform constant versus its nonuni-formness, and compensate the quality of video automatically.