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Improvement of picture quality on PDP-TV using adaptive gray-level method
Sang-chul Kim,Sung-jin Kang,Sung-Il Chien IEEE 2009 IEEE transactions on consumer electronics Vol.55 No.2
<P>Reducing dynamic false contour (DFC) is quite needed for image quality enhancement under the address display separate (ADS) driving scheme, while keeping a good gray scale rendition (GSR). The conventional method of reducing DFC effectively by using a limited number of graylevel deteriorates GSR quality in a still or slowly moving images in which DFC seldom occurs. To optimize DFC reduction and GSR improvement simultaneously, this paper proposes an adaptive gray-level method, in which input images are first classified by the motion information and one of five different gray-level systems is adaptively chosen depending on the classification result. The skin color area, which is sensitive to DFC artifacts, are detected and specially treated for further enhancement of picture quality.</P>
Fast Reference Region Adjustment Using Sizing Factor Generation in Correlation-Based Image Tracking
Sung, Si-Hun,Chien, Sung-Il The Korean Institute of Electrical Engineers 1998 Journal of Electrical Engineering and Information Vol.3 No.2
When size and shape of moving object have been changed, a correlator often accumulates walk-off error. A success of correlation-based tracking largely depends on choosing suitable window size and position and thus transferring the proper reference image to the next frame. For this, we propose the Adaptive Window Algorithm with Four-Direction Sizing Factors (AWA-FSF) for fast adjusting a reference region to enhance reliability of correlation-based image tracking in complex cluttered environments. Since the AWA-FSF is capable of adjusting a reference image size more rapidly and properly, we can minimize the influence of complex background and clutter. In addition, we can finely tune the center point of the reference image repeatedly after main tracking process. Thus we have increased stability and reliability of correlation-based image tracking. We tested performance of the AWA-FSF using 45 real image sequences made of over 3400 images and had the satisfied results for most of them.
영상의 저 비트 변환을 이용한 SAD 블록 정합 알고리즘
김상철(Sang-Chul Kim),박순용(Soon-Yong Park),진성일(Sung-Il Chien) 대한전자공학회 2014 전자공학회논문지 Vol.51 No.1
영상의 저 비트 변환 기반의 비트 플레인 정합방법(Bit-Plane Matching : BPM)은 기존의 블록 정합 방법들과 비교해 계산량을 줄이고 간단한 하드웨어 구조 설계를 통해 블록 정합 결과를 획득할 수 있지만, 블록 정합의 정확도가 비교적 낮은 문제점을 가지고 있다. 본 논문에서는 기존의 BPM방법들과 비교해 블록 정합의 정확도를 증가시키면서 동시에 논리 연산으로 정합 결과를 계산할 수 있는 저 비트 변환 기반의 절대 오차합(Reduced-bit transform based Sum of Absolute Difference : R-SAD)을 이용한 블록 정합 알고리즘을 제안한다. 이 방법은 현재 영상과 참조영상을 각각 2-bit의 영상으로 변환하고, 2-bit의 4레벨에 대한 입출력 관계를 이용하여 진리표를 획득한다. 진리표는 Karnaugh map을 통해 간소화 되어 논리 연산으로 절대 오차를 계산할 수 있다. 제안된 방법의 성능 평가를 위한 움직임 보상(Motion Compensation) 실험에서, R-SAD는 기존의 블록 정합 방법들과 비교해 높은 정확도의 정합결과를 획득할 수 있었다. The reduced-bit transform based bit-plane matching algorithm (BPM) can obtain the block matching result through its simple calculation and hardware design compared to the conventional block matching algorithms (BMAs), but the block matching accuracy of BPMs is somewhat low. In this paper, reduced-bit transform based sum of the absolute difference (R-SAD) is proposed to improve the block matching accuracy in comparison with the conventional BPMs and it is shown that the matching process can be obtained using the logical operations. Firstly, this method transforms the current and the reference images into their respective 2-bit images and then a truth table is obtained from the relation between input and output 2-bit images. Next, a truth table is simplified by Karnaugh map and the absolute difference is calculated by using simple logical operations. Finally, the simulation results show that the proposed R-SAD can obtain higher accuracy in block matching results compared to the conventional BPMs through the PSNR analysis in the motion compensation experiments.
적응적 오차 확산법을 이용한 하프톤 영상의 경계선 개선
김상철(Sang-Chul Kim),진성일(Sung-Il Chien) 大韓電子工學會 2011 電子工學會論文誌-SP (Signal processing) Vol.48 No.6
제한된 계조를 사용하는 영상장치들은 연속계조 영상과 시각적으로 유사한 영상을 획득하기 위해 하프토닝(halftoning) 방법을 사용한다. 다양한 하프토닝 방법 중 오차 확산법은 짧은 계산시간과 좋은 화질의 하프톤 영상(halftone image) 획득이 가능하여 다양한 응용 분야에 널리 사용되고 있다. 하지만 이 방법은 인접 픽셀에 오차를 확산하는 과정에서 경계선을 흩트리며 이로 인해 경계선이 약화 되고 영상의 선명도를 저하시킨다. 이러한 문제점을 개선하기 위해 본 논문에서 제안된 방법은 Floyd-Steinberg 오차확산법의 필터 가중치를 기반으로 처리 픽셀의 오차와 인접픽셀의 경계선 정보를 고려하여 오차 필터를 적응적으로 결정한다. 이 방법은 경계선 강화를 위한 기존 방법들과 비교해 처리절차가 간단하여 상대적으로 적은 양의 프로세스 자원을 사용한다. 그럼에도 불구하고 제안된 방법은 하프톤 영상의 경계선을 상당히 개선할 수 있었다. 이와 함께 객관적인 화질 평가를 위해 경계 상관도와 국부 평균 일치도를 이용하여 제안된 방법과 기존방법의 성능을 비교한다. A halftoning method is used to obtain a binary image visually similar to a continuous gray-level image through the image output devices employing the limited number of gray-levels. As a halftoning method the error diffusion method is widely used in various applications because of its low computational complexity and good image quality. However this method weakens the edge in the process of error diffusion to the neighboring pixels. In this case degradation of the edge quality and damage of the vivid image is expected. To solve these problems the proposed method determines the adaptive error filter considering the error information of the present pixel and edge distribution of the neighbor pixels. Compared with the conventional methods for enhancing edges the proposed method involves relatively a few process resources because of its simple procedure still considerably improving the edges in the halftone image. To evaluate the objective image quality the performance of the proposed method is compared with that of the conventional method in terms of the edge correlation and the local average accordance.
Choon-Sang Park,Jae Hyun Kim,Heung-Sik Tae,Sung-Il Chien IEEE 2012 IEEE transactions on plasma science Vol.40 No.5
<P>Temporal image sticking characteristics on the bright screen produced by a negative sustain waveform were examined in comparison with those produced by a positive sustain waveform. From the monitoring of the differences in the display luminance, chromaticity coordinate, color temperature, infrared emission, and address current between the cells with and without temporal image sticking, it was observed that the negative sustain waveform contributed to the reduction of temporal image sticking. When applying the negative sustain waveform, ion bombardment of the phosphor layer was minimized during a sustain discharge, thereby reducing the absorption of H<SUB>2</SUB>O onto the phosphor layers, as confirmed by thermal desorption spectroscopy and photoluminescence analyses. As a result, the temporal image sticking characteristics were improved, mainly due to less degradation of the visible conversion and fewer changes of the characteristics of the phosphor layer by diminishing the absorption of H<SUB>2</SUB>O onto the phosphor layer.</P>