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디지털카메라의 노이즈감소기능이 이미지 해상도에 미치는 영향
하동환(Dong-Hwan Har),박형주(Hyung-Ju Park) 한국콘텐츠학회 2009 한국콘텐츠학회논문지 Vol.9 No.5
최근 디지털카메라의 기술 개발은 빛이 부족한 상황에서도 사진용 플래시와 같은 장비를 사용하지 않고서 사진을 촬영할 수 있는 다양한 고감도 기능을 탑재하는 경향이다. 또한 다양한 고감도에 적용시킬 수 있는 디지털카메라의 노이즈감소기능도 동시에 개발되고 있다. 그러나 노이즈가 발생하기 쉬운 고감도 상황에서 디지털카메라의 노이즈감소기능은 노이즈를 감소시키는 동시에 이미지의 해상도도 감소시키는 경향을 보인다. 따라서 본 연구에서는 디지털카메라의 노이즈감소기능이 이미지 해상도에 미치는 영향을 실험을 통해 양적으로 수치화 하고자 한다. 실험은 해상도와 노이즈 타깃을 디지털카메라의 감도별로 촬영하고, 측정값을 분석한 결과 노이즈감소기능이 적용될 때 최대 15%까지 해상도가 감소하는 것을 확인할 수 있었다. 이와 같은 연구는 디지털카메라의 사용자에게는 노이즈감소기능의 정확한 활용을 가능하게 하며 제조사에게는 노이즈감소기능을 검증해 볼 수 있게 할 것이다. Recent digital camera development tendency shows the higher ISO extension which enables a user to take a picture in deemed lighting condition without using a flash or another equipment. Also noise reduction function has been developed to adjust the higher ISO extension. But using the high ISO causes a lot of noises so that proper noise reduction function should be adjusted. So the manufacturers introduce the advanced noise reduction function with higher ISOs as the digital camera performance development. On the other hands, the defect of noise reduction is not widely open such as remaining noise in high ISOs and decreasing resolution. Therefore, in this research we verify and experiment the decrease of resolution by using noise reduction function on a digital camera. Moreover we analyze the results how much the noise reduction function effects to the image resolution. And we present the results as practical numerical values.
논문 : 잉크젯 프린터를 이용한 흑백 사진 출력 연구 - ICC 프로파일 생성을 중심으로
하동환 ( Dong Hwan Har ),손영호 ( Young Ho Son ),노연숙 ( Yeon Sook Nok ) 한국사진학회 2006 AURA Vol.0 No.15
As digital cameras are widely popularized, digital printing with ink-jet printers is already a general work process. However, professionals prefer silver halide photography when working with B/W(black and white) photography. It is because of the problems that occurs when B/W photography is printed with ink-jet printers, like degradation in the high tone and low tone, posterization effect, difficulties in reproducing neutral gray. Until now, buying a RIP(Raster Image Processor) or an ink designed for the printing additionally was the only way to fix the problems. It caused extra expense, and had limits to be used widely, which precluded the generalization of B/W printing with ink-jet printers. This study therefore suggests a method to correspond the silver halide photography`s tone reproduction with each zones from the zone system of silver halide photography, in order to print digital B/W photography with rich tone. Also, it adopts the concept of CMS(Color Management System) to print neutral colors accurately in the digital color system. And the study proposes how to make an appropriate target to solve problems that could happen when B/W printing digitally. The target fits the ICC(international Color Consortium) Profile specification, which enables digital image works easy, and I expect many photographers would produce high quality ink-jet B/W prints.
영상의 기초정보 추출을 위한 렌즈 화각 및 피사체 거리 측정 연구
황민구(Min-Gu Hwang),하동환(Dong-Hwan Har) 대한전자공학회 2010 대한전자공학회 학술대회 Vol.2010 No.6
This study considered optical principals and geometric elements of the lens, and analyzed the location of vanishing point through 3D model about the specific objet in the photo. In addition, it measured lens angle used to actual digital photographing by applying lens angle values from the focal distance based on 35mm film. Like this, if the completed measuring method is applied, lens angle of the digital photos can be found out without metadata. and using this theory we can find of object distance.
영상구성 파라미터 기반 지능형 OST 매칭 프로그램 개발 연구
조두희(Cho, Do Hee),하동환(Har, Dong-Hwan) 한국영상제작기술학회 2021 영상기술연구 Vol.- No.37
In this study, an ‘intelligent OST matching program’ was developed to find background music using image recognition methods. To make this possible, convergence content was created by selecting scene analysis elements as ‘emotion,’ ‘color,’ and ‘pixel motion speed,’ and music components as ‘pitch,’ ‘tempo,’ and ‘dynamics.’ In the program, a ‘BGM library’ was created in advance and various music was classified. In addition, it was possible to select music that matches as much as possible by analyzing the input video and comparing the components with the analysis results of the music stored in the ‘BGM library’. In this process, a radial pentagonal graph was used to make it easier to see the comparison process between video and background music. Finally, it was possible to select ‘BGM Choice Sensitivity’ and ‘The Ratio of Background Music to Video Sound,’ and if a matching background music could not be found, music selected in advance could be used. I hope that the program produced in this way can be appropriately used for the creative activities of individual video producers.