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선형 추정 CDF에서 밝기 보존을 이용한 이미지 콘트라스트 향상 기법
조화현,최명렬 한국정보처리학회 2004 정보처리학회논문지. 소프트웨어 및 데이터 공학 Vol.11 No.7
본 논문에서는 평판디스플레이 상에서 밝기 보존을 이용한 콘트라스트 향상 기법을 제안하였다. 제안한 방식은 실시간 처리를 위하여 선형추정방법을 적용하여 누적분포함수를 계산함으로써 하드웨어 복잡성을 감소시켰다. 본 논문에서는 제안한 알고리즘을 효과적으로 처리하기 위하여 누적분포함수의 샘플 값과 배럴쉬프트(Barrel Shift)를 사용하였다. 제안된 방식에 의한 처리 결과와 원 영상의 화질 평가를 위하여 시각적 검증과 히스토그램 편차를 도입하였다. In this paper, we have proposed an image contrast control method using brightness preserving on the FPD(Flat Panel Display). The proposed method can be easily applied to the FPD required real-time processing, since hardware complexity is greatly reduced using linear approximation method of CDF(Cumulative Density Function). For effective processing of the proposed algorithm, we have utilized the sample value of CDF and Barrel Shift. Visual test and standard deviation of their histogram have been introduced to evaluate the resultant output images of the proposed method and the original ones.
조화현,최명렬,Cho Hwa-Hyun,Choi Myung-Ryul 대한전자공학회 2005 電子工學會論文誌-SP (Signal processing) Vol.42 No.1
본 논문에서는 실시간 처리론 위한 적응형 콘트라스트 조정 기법을 제안하였다. 제안된 방식은 과도한 영상의 밝기 변화를 제어하기 위하여 활률밀도함수(PDF: Probability Density Function)를 이용하였다. 또한 제안된 알고리즘은 처리된 영상에 영향을 주지 않으면서 최대 콘트라스트를 얻을 수 있었다. 하드웨어의 복잡성을 감소하기 위하여 누적분포함수(CDF: Cumulative Density Function)의 샘플 값을 이용한 선형화 방법을 이용하였다. 제안된 방식에 의한 처리 결과와 원 영상의 화질 평가를 위하여 시각적 검증과 히스토그램 편차를 도입하였다. In this paper, we propose an adaptive contrast control method for the flat real-time processing. The proposed method has employed probability density function(PDF) in order to control a sudden change in image-brightness. In addition, the proposed algerian obtains the maximum contrast without affecting the processed image. In order to reduce hardware complexity, we have utilized approximated CDF based on sampling values. Visual test and standard deviation of their histogram have been introduced to evaluate the resultant output images of at: proposed method and the original ones.
선형 추정 CDF에서 밝기 보존을 이용한 이미지 콘트라스트 향상 기법
조화현,최명렬,Cho Hwa-Hyun,Choi Myung-Ryul 한국정보처리학회 2004 정보처리학회논문지B Vol.11 No.7
본 논문에서는 평판디스플레이 상에서 밝기 보존을 이용한 콘트라스트 향상 기법을 제안하였다. 제안한 방식은 실시간 처리를 위하여 선형추정방법을 적용하여 누적분포함수를 계산함으로써 하드웨어 복잡성을 감소시켰다. 본 논문에서는 제안한 알고리즘을 효과적으로 처리하기 위하여 누적분포함수의 샘플 값과 배럴쉬프트(Barrel Shift)를 사용하였다. 제안된 방식에 의한 처리 결과와 원 영상의 화질 평가를 위하여 시각적 검증과 히스토그램 편차를 도입하였다. In this paper, we have proposed an image contrast control method using brightness preserving on the FPD(Flat Panel Display). The proposed method can be easily applied to the FPD required real-time processing, since hardware complexity is greatly reduced using linear approximation method of CDF(Cumulative Density Function). For effective processing of the proposed algorithm, we have utilized the sample value of CDF and Barrel Shift. Visual test and standard deviation of their histogram have been introduced to evaluate the resultant output images of the pro-posed method and the original ones.
조화현,최철호,권병헌,최명렬,Jo, Hwa-Hyeon,Choe, Cheol-Ho,Gwon, Byeong-Heon,Choe, Myeong-Ryeol 한국정보처리학회 2000 정보처리논문지 Vol.7 No.6
In this paper, we have proposed the contrast control method for improving image quality. The proposed method can be easily applied to the FPD (flat panel display) which requires real-time processing because of its lower hardware complexity that the conventional methods. In addition, it can flexibly control the contrast of input image by arraying the weight values that control the contrast range. Visual test and standard deviation of their histograms have been introduced to evaluate the results of proposed method and the original images. The functional operation of he proposed method has been verified using the SYNOPSYS VHDL tool and computer simulation. Its results show that he proposed method might be very suitable for real-time processing on the FPD.
지구단위 관광목적지의 재생계획기준 선정 및 우선순위 분석: 설악동 집단시설지구를 중심으로
조화현,유민태,박태원 한국도시부동산학회 2019 도시부동산연구 Vol.10 No.2
This study was carried out for the purpose of suggesting the types of remodelling models of collective facility area of national park in Korea. Status data of 41 collective facility areas among the 13 mountain type of National Park were selected for the scope of the study and each area was relatively compared and analyzed based on the quantitative data. The results of the study were as follows : 2 of 41 collective facility areas are needed to delineated to function transfer type, 16 of 41 collective facility areas to convenience supporting type, 17 of 41 collective facility area to ecological restoration type and 6 of 41 collective facility area to inquiry assistance type. the 22 areas equivalent to 54% showed to have the need of retention which indicates the approval of park collective facility area was abundant or its function was in the process of deterioration without corresponding to the change of time. From these consequences, it was expected to provide clean and natural collective facility area for the rational use without environmental deteriorations of national park, and bear assistance facilities and convenience facility to neighboring cities and tourist area for the development and regeneration of the region.
FPD상에서 전화면 디스플레이를 위한 $\Delta$-형 필터의 특성
조화현,최철호,권병헌,최명렬 한국멀티미디어학회 2000 멀티미디어학회논문지 Vol.3 No.2
본 논문에서는 선행 연구한 $\Delta$-형 필터를 토대로 하여 이의 특성을 종합적으로 비교 분석하였다. 먼저 화면 확장을 위한 $\Delta$-형 필터의 알고리즘에 대해서 논하였고, 이의 특성, 즉 $\Delta$-형 필터의 에지보존특성과 알고리즘에 근거하여 기존 방식들과의 연산량을 비교하였다. 그리고 제안한 방식과 기존의 알고리즘을 PSNR을 도입하여 정량적으로 비교하였으며, Synopsys VHDL에 의한 구현을 통하여 하드웨어의 복잡성을 비교하였다. 마지막으로 $\Delta$-형 필터의 특징과 trade off에 대해서 논하였다. In thid paper, we have analized the characteristics of $\Delta$-shaped filter based on preceeding study. The algorithm of $\Delta$-shaped filter for full screen display has been discussed including their edge-preserving characteristics and computaion complexity compared with the conventional algorithms. PSNR has been employed to compare the proposed method to the conventional algorithms. The proposed algorithm has been implemented using Synopsys VHDL tool. In addition, the features and trade off of the $\Delta$-shaped filter have been discussed.
접속부사의 담화적 의미 연구 - 예능 프로그램 구어 자료를 중심으로 -
조화현 ( Jo Hwahyun ),이선웅 ( Yi Seon-ung ) 연세대학교 언어정보연구원 2021 언어사실과 관점 Vol.54 No.-
In this study, we investigated the discourse meanings of four typical connective adverbs used some actual colloquial (spoken language) materials. In this paper, we analyzed each connective adverb by researching the discourse meanings of the connective adverbs from the perspective that the intention of the speaker is added to the basic meaning and the topic range is displayed differently. In Chapter 3, we showed ‘utterance induction’ and ‘topic change’ as the discourse meanings of ‘그리고[geurigo]’. In Chapter 4, we showed ‘utterance induction’, ‘topic introduction’ and ‘topic change’ as the discourse meanings of ‘그러면[geureomyeon]’. Futhermore we argued that the difference between “topic introduction” and “topic change” is confirmed depending on the hearer’s condition whether a hearer expects the scope of the topic to change or not. In Chapter 5, we showed ‘utterance induction’ and ‘topic change’ as the discourse meanings of ‘그런데[geureonde]’. Finally in Chapter 6, we showed ‘utterance consent’, ‘utterance correction’ and ‘return to topic’ as the discourse meanings of “그러니까[geureonikka]”.