복구패턴 정합을 통한 기하학적 왜곡에 적응적인 워터마킹

전영민,고일주,김동호,Jun Young-Min,Ko Il-Ju,Kim Dongho 한국정보처리학회 2005 정보처리학회논문지B Vol.12 No.3

워터마킹에서 영상의 평행이동, 회전, 크기변환 왜곡에 기인한 워터마크 삽입 위치와 추출 위치의 불일치는 해결해야 하는 문제이다. 본 논문에서는 복구패턴 정합을 통한 영상동기화를 이용함으로써 기하학적 왜곡에 강인한 워터마킹 방법을 제안한다. 제안하는 방법은 복구패턴을 정의하여 워터마크가 삽입된 영상에 복구패턴을 삽입 배포한다. 그리고 배포된 영상으로부터 복구패턴을 추출하여 삽입한 복구패턴과 비교함으로써 기하학적 왜곡 여부를 확인한다 기하학적 왜곡이 발생하였다면 왜곡된 만큼 역변환을 함으로써 워터마크 삽입 위치와 추출 위치를 동기화 한다. 제안한 방법의 성능을 평가하기 위하여 이동, 회전, 스케일링 공격에 대한 실험결과를 보인다. The mismatched allocation of watermarking position due to parallel translation, rotation, and scaling distortion is a problem that requires an answer in watermarking. In this paper, we propose a watermarking method robust enough to hold against geometrical distorting using restoration pattern matching. The proposed method defines restoration pattern, then inserts the pattern to a watermark embedded image for distribution. Geometrical distortion is verified by comparing restoration pattern extracted from distributed image and the original restoration pattern inserted to the image. If geometrical distortion is found, inverse transformation is equally performed to synchronize the watermark insertion and extraction position. To evaluate the performance of the proposed method, experiments in translation, rotation, and scaling attack are performed.

DCT 기반 워터마킹의 적응적 강인화 방법

전영민,김계영,최형일,Jun, Young-Min,Kim, Gye-Young,Choi, Hyung-Il 한국정보처리학회 2003 정보처리학회논문지B Vol.10 No.6

본 논문에서는 인간시각에 대한 워터마크의 무감지성을 향상하고 워터마크를 제거하고자 하는 공격에 강인한 워터마킹 방법을 제안한다. 제안하는 방법은 워터마크를 삽입할 대상의 DCT 블록에 대한 인간의 시각적인 특성을 고려하여 워터마크의 삽입 여부와 블록에 삽입될 워터마크의 위치와 강도를 적응적으로 결정한다. 워터마크될 블록을 선택하기 위하여 사용되는 특징은 텍스쳐, 휘도, 대비이다. 본 논문은 제안된 방법의 성능을 평가하기 위하여 절단, 영상강화, 저주파 필터링, PEG 압축의 영상처리 공격에 대한 실험결과를 보인다. In this paper, we propose an improved method of watermarking to increase the invisibility of a watermark and robustness against attacks for the purpose of removing the embedded watermark. The proposed method adaptively selects DCT blocks and determines position and intensity for watermarking based on the characteristics of human visual system. The used features are texture, luminance and contrast. We show the experimental results against image processing attacks such as cropping, image enhancement, low pass filtering, and JPEG compression, and then discuss the performance of the proposed method.

상용차 S/CAM 샤프트 단조금형 성형 해석

전영민(Young-Min Jun),성백섭(Back-Sub Sung),김미애(Mi-Ae Kim),차용훈(Yong-Hoon Cha) 한국생산제조학회 2008 한국생산제조시스템학회 학술발표대회 논문집 Vol.2008 No.5

In the hot forging process, the forging faulty product due to strain and temperature should be controlled in order to obtain sound S/CAM forging products. The forging defects that are caused by metal were strain, temperate, and inclusion. But the control of forging defects has been based on the experience of the foundry engineers. In this paper, the computer simulation analyzed the effective plastic strain and temperature behaviors. The quantitative analyses which proposed the effective mold design of S/CAM shaft was executed. The parameters of forging shape that affected on the optimize conditions that was calculated with simple equation were investigated. it is expected that the developed analysis model and design technique would greatly contribute to the drum brake optimal design considering effective plastic strain and temperature affected behaviors.

공개키 기반 구조를 이용한 비대칭 워터마킹

전영민(Young-Min Jun),양선옥(Sun-Ouk Yang),김계영(Gye-Young Kim) 한국멀티미디어학회 2004 멀티미디어학회논문지 Vol.7 No.9

한국에서의 도시쓰레기 공기 수집 시스템의 타당성

서동주,전영민 ( Suh Dong Soo,Jun Young Min ) 한국화학공학회 1979 Korean Chemical Engineering Research(HWAHAK KONGHA Vol.17 No.2

Pneumatic Refuse Collection (PRC) system and it`s machinery components are briefly introduced, which is new means of the city refuse collection, and two equations which can be used in estimation of required pump house power and total construction cost of the PRC system are shown. And the economic feasibility of the system is studied at high density residential area in Seoul. In this work the PRC system is compared with the compactor truck collection system which has more advantages than the common truck collection systems and it becomes clear that the PRC system is more economical than compactor truck system in Korea, too; with 20% of annual wage increasing rate the break even point comes after 4 years; with 10%, it comes after 6.5 years; the PRC system has 40 years life cycle. And the time when the break even point would be on the first year is estimated to be 9 years after from now under l0%wage increasing rate.

히스토그램 정보를 이용한 저작권 보호와 인증을 위한 워터마킹

이나영(Na-Young Lee),전영민(Young-Min Jun),김계영(Gae-Young Kim),최형일(Hyung-Il Choi) 한국정보과학회 2002 한국정보과학회 학술발표논문집 Vol.29 No.1A

본 논문에서는 저작권 보호(copyright protection)와 인증(authentication)을 동시에 할 수 있는 워터마킹 기법(watermarking method)을 제안한다. 저작권을 보호하기 위하여 원 영상을 웨이블릿 변환하여 얻어진 웨이블릿 계수 중 중요한 계수의 LSB(Least Significant Bit)와 워터마크를 XOR연산으로 워터마크를 삽입한다. 소비자측면에서는 전송 받은 디지털 컨텐츠에 대한 인위적인 조작 여부를 쉽고 간단하게 파악할 수 있다. 기존 방법의 경우 워터마크로 ID-number나 이진 영상을 사용한 반면 본 논문에서는 워터마크로 그레이 영상을 사용하므로 저작권 정보를 잘 표현할 수 있으며 워터마크 추출 시에 원 영상을 필요로 하지 않는다.

불법 주정차 무인 자동 단속을 위한 환경 변화에 강건한 적응적 배경영상 모델링 알고리즘

주성일(Sung-Il Joo),전영민(Young-Min Jun),최형일(Hyung-Il Choi) 한국컴퓨터정보학회 2008 韓國컴퓨터情報學會論文誌 Vol.13 No.6

실시간 입력영상 분석에 의한 객체 추적은 사람의 시각이 요구되는 여러 응용분야에서 관심 있는 주제 중 하나이다. 객체를 추적하기 위해서는 객체 검지가 선행 된다. 실외 환경에서 안정적인 객체 검지 성능의 달성은 태양의 남중고도 변화에 따른 빛과 그림자의 변화, 자연현상 등의 다양한 환경변화를 수용하는 효과적인 적응적 배경영상 생성 방법이 필요하다. 본 논문에서는 불법 주정차 무인 자동 단속 응용에 효과적으로 활용 가능한 환경 변화에 강건한 적응적 배경영상 생성과 이동 객체의 정지 여부를 판단하는 방법을 제안한다. 본 논문에서 제안하는 적응적 배경영상 생성 방법은 먼저, 초기 배경영상을 생성 후, 생성된 초기 배경영상과 입력영상 프레임 간의 차연산 기법으로 객체를 검지하고, 객체 검지 결과로 이동객체를 추적한다. 또한 객체 검지의 결과로부터 얻어진 객체영역을 제외한 입력영상의 영역을 활용하여 배경영상을 갱신한다. 이후 갱신된 배경영상과 입력영상 간의 차연산 방법으로 객체 검지를 수행하고 이후, 추적, 객체영역을 제외한 영역으로 배경영상 갱신의 과정을 반복한다. 실험에서는 제안방법을 가변하는 실제 도로환경에 적용하여 효과적으로 객체 검지가 가능함과 서행하는 객체 또한 효과적으로 검지됨을 보이고 이동 객체의 정지 여부를 판단할 수 있음을 보인다. The Object tracking by real-time image analysis is one of the major concerns in computer vision and its application fields. The Object detection process of real-time images must be preceded before the object tracking process. To achieve the stable object detection performance in the exterior environment, adaptive background model generation methods are needed. The adaptive background model can accept the nature's phenomena changes and adapt the system to the changes such as light or shadow movements that are caused by changes of meridian altitudes of the sun. In this paper, we propose a robust background model generation method effective in an illegal parking auto-detection application area. We also provide a evaluation method that judges whether a moving vehicle stops or not. As the first step, an initial background model is generated. Then the differences between the initial model and the input image frame is used to trace the movement of object. The moving vehicle can be easily recognized from the object tracking process. After that, the model is updated by the background information except the moving object. These steps are repeated. The experiment results show that our background model is effective and adaptable in the variable exterior environment. The results also show our model can detect objects moving slowly. This paper includes the performance evaluation results of the proposed method on the real roads.

사회경제적 특성에 따른 정신분열병 환자의 출생의 계절성에 관한 연구

박현(Hyun Park),문인원(In Won Moon),전영민(Young Min Jun),박종익(Jong Ik Park) 한국정신병리진단분류학회 2000 精神病理學 Vol.9 No.2

N/A N/A

폴리프로필렌의 물리적인 개질 (4)

임상규(Sang Kyu Lim),손태원(Tae Won Son),박준호(Jun Ho Park),전영민(Young Min Jeon),정광섭(Kwang Seop Jeong) 한국고분자학회 1998 폴리머 Vol.22 No.6

간이식 후 발생한 간세포암의 폐 전이에 대한 종양절제술의 역할

김현수(Hyun Soo Kim),서경석(Kyung-Suk Suh),전영민(Young-Min Jun),김태훈(Teahoon Kim),신우영(Woo Young Shin),이남준(Nam-Joon Yi),한국남(Kook Nam Han),김영태(Young Tae Kim),김태유(Tae-You Kim),이건욱(Kuhn Uk Lee) 한국간담췌외과학회 2009 한국간담췌외과학회지 Vol.13 No.4

Purpose: Liver transplantation (LT) has been advocated as a good management option for patients with hepatocellular carcinoma (HCC). The rate of HCC recurrence after LT is about 20%. Although the median survival time of patients with HCC recurrence is 7∼9 months, the role of surgical treatment for metastatic tumors has been reported on. In this study, we evaluated the role of metastasectomy for treating patients with pulmonary metastasis from HCC after LT. Methods: We retrospectively analyzed 10 patients with pulmonary metastasis after LT and who were treated between April 2005 and October 2007. The underlying liver disease was cirrhosis caused by chronic viral hepatitis. The surveillance protocol for HCC recurrence was as follows: assessing the serum alpha-fetoprotein level every 1 month, chest and abdomen-pelvic computed tomography every 3 months and a bone scan every 1 year or when bone metastasis was suspected. The patients with less than 3 metastatic lesions were recommended to undergo metastasectomy (Group S, n=6) and the patients with more 4 lesions were recommended nonsurgical management, including chemotherapy (Group N, n=4). Results: All the metastatic lesions were detected on the protocol chest CT scans. The median recurrence time was 7.4 months (0.8∼18.2) after LT; this was 11.0 (4.8∼18.2) months for Group S and 2.0 (0.8∼3.3) months for Group N. One patient had a single lesion and the others had multiple lesions on multilobes. The median survival times of Group S were 29.3 (18.5∼41.3) months after pulmonary metastasis and 40.3 (23.3∼48.0) months after transplantation; 5 patients had no recorded evidence of their disease status. The median survival time of Group N was 4.3 (4.0∼6.3) months after metastasis and 6.2 (5.3∼7.1) months after transplantation; all the patients have since died. Conclusion: The survival outcome seemed to be good for the patients who underwent pulmonary metastasectomy for HCC, if it was detected earlier and it was resectable (≤3 lesions). However, further study is required for validating the survival benefit of pulmonary metastasectomy.