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Video Processing for Human Perceptual Visual Quality-Oriented Video Coding
Hyungsuk Oh,Wonha Kim IEEE 2013 IEEE TRANSACTIONS ON IMAGE PROCESSING - Vol.22 No.4
<P>We have developed a video processing method that achieves human perceptual visual quality-oriented video coding. The patterns of moving objects are modeled by considering the limited human capacity for spatial-temporal resolution and the visual sensory memory together, and an online moving pattern classifier is devised by using the Hedge algorithm. The moving pattern classifier is embedded in the existing visual saliency with the purpose of providing a human perceptual video quality saliency model. In order to apply the developed saliency model to video coding, the conventional foveation filtering method is extended. The proposed foveation filter can smooth and enhance the video signals locally, in conformance with the developed saliency model, without causing any artifacts. The performance evaluation results confirm that the proposed video processing method shows reliable improvements in the perceptual quality for various sequences and at various bandwidths, compared to existing saliency-based video coding methods.</P>
Image Resolution Rescaling by 4x4 Integer DCT
Hyungsuk Oh,Wonha Kim 대한전자공학회 2007 ITC-CSCC :International Technical Conference on Ci Vol.2007 No.7
In the current integrated networks, it is essential to scale image resolution for the efficient transmission of video data. Although the use of H.264 adopting the integer DCT rapidly increases, the existing image scaling methods operate on the real DCT that is adopted by MPEG-1,2,4. In this paper, we propose a method that scales image resolution on the integer DCT domain. For this purpose, we represent each image scaling procedure in matrix multiplications. We factorize the scaled DCT blocks and the post factorization (PF) matrix from the multiplication of the scaling matrix and the original integer DCT blocks. Experiments show that the proposed method produces the almost same performance as that of the methods performed in the real DCT domain.
H.264/AVC에서 고속 I Slice 부호화/복호화 방법
오형석(Hyungsuk Oh),신동인(Dongin Shin),김원하(Wonha Kim) 대한전자공학회 2009 電子工學會論文誌-CI (Computer and Information) Vol.46 No.2
본 논문에서는 H.264/AVC의 I-slice의 모든 블록들을 복원하지 않고 블록의 경계 부분만을 복원하여 intra prediction을 고속으로 수행하는 방법을 개발한다. 이를 위하여 intra prediction의 참조 화소들로 구성될 수 있는 차이 블록의 경계를 고속으로 복원하는 고속 역 정수 DCT를 개발한다. 고속으로 복원된 차이 경계 화소들과 각 예측 모드에 알맞게 구한 예측 화소들을 더하여 경계 화소들을 update하며, intra prediction에 필요한 참조 화소들로 구성한다. 개발된 기법은 H.264/AVC의 정수 DCT와 호환성을 유지하고, 고화질 영상 부호화시 사용되는 대표적인 HD 시퀀스에 적용 가능함을 실험으로 검증하였다. This paper develops a fast method performing intra prediction which only restores block boundary pixels without decoding all blocks in an I slice of H.264/AVC. To accomplish this, we develop a fast integer inverse DCT scheme that quickly decodes residual block boundary which can be consisted of references pixels. we add the restored block boundary pixels and appropriate calculated prediction pixels for each intra prediction mode and consist of needed reference pixels. The experiments showed that the proposed method produces the reliable performance with reducing the computational complexity, compared to conventional method when applied to H.264/AVC integer DCT.
하천 및 호소 퇴적물 입도분석 방식의 비교와 입도에 따른 중금속물질의 분포경향
오형석(Oh Hyungsuk),신원식(Shin Wonsik),김준하(Kim Joonha),황인성(Hwang Inseong),허진(Hur Jin),신현상(Shin Hyunsang),오정은(Oh Jeongeun),허인애(Huh Inae),김영훈(Kim Younghun) 한국지반환경공학회 2010 한국지반환경공학회논문집 Vol.11 No.5
한강, 낙동강, 영산강, 금강의 하천 및 호소퇴적물을 대상으로 건식체질법, 습식체질법, 광산란법(PSA) 등의 입도분석법을 비교연구 하였다. 건식체질법의 경우 건조과정에서 발생하는 엉김현상에 의해 오차가 크게 발생하며 이러한 현상은 호소시료의 경우 두드러지게 나타났다. 습식체질법은 건식체질법에 비해 복잡하고 노동력이 보다 많이 필요하지만 정확한 분석이 가능하며 PSA의 경우에도 습식체질과 유사한 경향을 나타내었다. 엉김현상을 방지하기 위한 동결건조 및 과산화수소수에 의한 유기물의 산화/동결건조의 경우 엉김현상을 일부 개선할 수 있었으나 여전히 습식체질에 비하여 미세입자의 분율이 적게 나타났다. 입도별 중금속의 용출량 및 함유량이 조사되었으며 예상된 바와 같이 호소 및 하천시료 모두 미세입자에서 높은 농도의 중금속이 용출되었다. 퇴적물의 관리에 있어서 정확한 입도분석법의 사용과 미세입자에 대한 관리가 보다 중요하다. Dry sieving, wet sieving and photoscattering analyzer were tested as particle size analyzing methods for sediments from rivers and lakes of Han river, Nakdong river, Youngsan river, and Kumgang river area. Dry sieving showed a big error due to coagulating effect over drying process and this phenomena was severe for lake sediment. Wet sieving and PSA showed an accurate results though wet sieving needs more labor and complicate processes. Freeze-dry or freeze-dry after oxidation of organics with hydrogen peroxide showed improved results but gave lower portion of fine particles in comparing with wet sieving. Heavy metal contents and extractable metal contents were investigated for the sediments and high heavy metal content and extractable amount were obtained from fine particles as expected. Using of proper particle size analyzing method is important and the sediment management should be focused on the fine particles.
임의의 직교 블록 변환 영역에서 영상 특성에 적합한 필터를 사용한 영상 해상도 변환
오형석(Hyungsuk Oh),김원하(Wonha Kim),구준모(Junmo Koo) 대한전자공학회 2008 電子工學會論文誌-SP (Signal processing) Vol.45 No.5
본 논문에서는 임의의 블록 변환 영역에서 영상의 특성에 적절한 필터를 사용하여 영상의 해상도를 변환하는 기법을 개발한다. 이를 위하여 임의의 직교 transform 영역에서 해상도 변환을 수행하는 모든 과정을 matrix 곱으로 표현하여 해상도 변환을 수행하는 matrix를 유도한다. 해상도 변환을 수행하는 matrix는 영상 특성에 알맞은 필터를 선택하여 사용할 수 있도록 설계한다. 개발된 기법은 다양한 transform 영역에 적용할 수 있고, 동영상 부호화시 발생되는 inter/intra block들이 혼합되어 있는 영상의 해상도 변환에 적용 가능함을 실험을 통하여 검증하였다. In this paper, we develop a method that changes the resolutions of images in an arbitrary block transform domain by using a filter that suits to the characteristics of the underlying images. To accomplish this, we represent each procedure resizing images in an arbitrary transform domain as matrix multiplications and we derive the matrix that scales the image resolutions from the matrix multiplications. The resolution scaling matrix is also designed to be able to select the up/down-sampling filter that suits the characteristics of the image. Experiments show that the proposed method produces the reliable performances when it is applied to various transforms and to images that are mixed with predicted and non-predicted blocks which are generated during video coding.
Determination of the molecular assembly of actin and actin-binding proteins using photoluminescence
Park, Byeongho,Oh, Seunghee,Jo, Seunghan,Kang, Donyoung,Lim, Juhwan,Jung, Youngmo,Lee, Hyungsuk,Jun, Seong Chan Elsevier 2018 Colloids and surfaces Biointerfaces Vol.169 No.-
<P><B>Abstract</B></P> <P>Actin, the most abundant protein in cells, polymerizes into filaments that play key roles in many cellular dynamics. To understand cell dynamics and functions, it is essential to examine the cytoskeleton structure organized by actin and actin-binding proteins. Here, we pave the way for determining the molecular assembly of the actin cytoskeleton using direct photonic <I>in situ</I> analysis, providing the photoluminescence characteristics of actin as a function of filament length and bundling, without labeling. In experiments for monomeric and filamentous actin reconstituted <I>in vitro</I>, structural forms of actin are identified from the peak positions and intensities of photoluminescence. Actin monomers exhibited small intensity emission peaks at 334 nm, whereas filamentous and bundled actin showed a shifted peak at 323 nm with higher intensity. The peak shift was found to be proportional to the length of the actin filament. With probing structural change of actin in various cells <I>in vivo</I>, our study provides an efficient and precise analytical <I>in situ</I> tool to examine the cytoskeleton structure. It will be beneficial for elucidating the mechanism of various cellular functions such as cell migration, differentiation, cytokinesis and adhesion. Furthermore, our technique can be applied to detect the alterations in the cell cytoskeleton that can occur during many pathological processes.</P> <P><B>Highlights</B></P> <P> <UL> <LI> Modification of actin samples with different structures using binding protein. </LI> <LI> Method for monitoring of actin structure from monomer to polymerized protein. </LI> <LI> Polymerization rate of actin under several temperatures and heat energy. </LI> <LI> Label-free detection of protein in both of <I>in vivo</I> and <I>in vitro</I> conditions. </LI> </UL> </P> <P><B>Graphical abstract</B></P> <P>Actin’s structure and assembly behavior are determined by light absorption and photoluminescence characteristics under both <I>in vitro</I> and <I>in vivo</I> conditions.</P> <P>[DISPLAY OMISSION]</P>