• Title/Summary/Keyword: Pixel error

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The Compensation of Pixel Voltage Error for a-Si TFT LCDs Regarding the Input Gamma Voltage

  • Kang, Seung-Jae;Lee, Jun-Pyo;Park, Young-Bae;Moon, Hoi-Sik;Kong, Hyang-Shik;Kim, Kyung-Seop;Kim, Sang-Su;Kim, Su-Ki
    • 한국정보디스플레이학회:학술대회논문집
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    • 2002.08a
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    • pp.560-562
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    • 2002
  • The liquid crystal(LC) pixel capacitance Clc, which varies as a function of applied pixel voltage, is a main factor of pixel voltage errors on input gamma voltage, and therefore of the electro-optics(E-O) characteristics of LC pixel for a-Si TFT LCDs. The pixel voltage error(${\Delta}$Vp) for input gamma voltage was simulated for 14.1 inch diagonal XGA panel. An agreement between the experimental results and simulation was satisfactory for the gamma voltage compensation, ${\Delta}$Vp of the input gamma voltage. The proposed compensation method was successfully introduced to a 14.1 inch diagonal XGA panel, and a remarkable improvement of image sticking was achived.

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Pixel decimation for block motion vector estimation (블록 움직임 벡터의 검출을 위한 화소 간축 방법에 대한 연구)

  • Lee, Young;Park, Gwi-Tae
    • Journal of the Korean Institute of Telematics and Electronics S
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    • v.34S no.9
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    • pp.91-98
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    • 1997
  • In this paper, a new pixel decimation algorithm for the estimation of motion vector is proposed. In traditional methods, the computational cost can be reduced since only part of the pixels are used for motion vector calculation. But these methods limits the accuracy ofmotion vector because of the same reason. We derive a selection criteria of subsampled pixels that can reduce the probablity of false motion vector detection based on stochastic point of view. By using this criteria, a new pixel decimation algorithm that can reduce the prediction error with similar computational cost is presented. The simulation results applied to standard images haveshown that the proposed algorithm has less mean absolute prediction error than conventional pixel decimation algorithm.

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Accurate depth extraction in 3D integral imaging using sub-pixel registration information

  • Hong, Kee-Hoon;Hong, Ji-Soo;Park, Jae-Hyeung;Lee, Byoung-Ho
    • 한국정보디스플레이학회:학술대회논문집
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    • 2009.10a
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    • pp.1350-1353
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    • 2009
  • Conventional depth extraction in integral imaging is based on the disparity information between the elemental images. Since the disparity is measured in pixel unit, however, the extracted depth is discrete, resulting in the quantization error. Moreover, the quantization error grows as the object depth increases, which limits the accuracy of the depth extraction for distant objects. In this paper, we propose a new method for depth extraction in integral imaging using sub-pixel registration information between subimages to obtain linear and accurate depth.

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Advanced Error Tracking Algorithm for H.263 (H.263에 적합한 개선된 에러 트래킹 알고리즘)

  • Hyo-seok Lee;Soo-Mok Jung
    • Journal of the Korea Computer Industry Society
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    • v.5 no.1
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    • pp.123-130
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    • 2004
  • In this paper, an advanced error tracking algorithm by using feedback channel was proposed for error resilient transmission. Using this proposed algorithm, the propagation of errors were reduced within the decoded data over bit error prone network. The addresses of corrupted blocks are reported to encoder by decoder. With negative acknowledgments of feedback channel, the encoder can precisely calculate negative acknowledgments and track the propagated errors by examining the backward motion dependency for proper pixel in the current encoding frame. The error-propagation effects can be terminated completely by INTRA refreshing the affected macro-blocks by using proposed error tracking algorithm. By utilizing the selective four-corner error tracking approximation, the error tracking computations of the proposed algorithm is less than that of the algorithm using full pixel without substantial degradation in video quality. The proposed algorithm can track errors rapidly and accurately.

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Error-Diffusion Technique using Variable Principle Distances for LCD Monitor (액정디스플레이를 위한 가변 주거리 기반의 오차 확산 기법)

  • Yoon, Jo-Seph;Park, Gyeong-Mi;Kim, Young-Bong
    • Journal of Korea Multimedia Society
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    • v.12 no.3
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    • pp.362-371
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    • 2009
  • The key technology for developing high quality LCDs is about manufacturing BLUs with homogeneous dot distributions. Commonly, homogeneous dot distributions are obtained by the halftoning methods which convert a gray-scale image to a binary image. Among many halftoning algorithms, the error-diffusion technique based on the principle distance is known to show homogeneous dot distributions. However, this technique has a drawback; the extent of the principle distance at each pixel with respect to those of the neighboring pixels can be too small or big creating a gap or overlap. In this paper, we propose a new error diffusion algorithm based on the variable principle distance which improves the existing error diffusion technique based on the principle distance. The variable principle distance at a given pixel is calculated with gray-scale values of the pixel and its neighbors and thus the principle distance value is variable depending on the direction from that pixel. This variable principle distance technique helps BLUs obtain homogeneous dot distributions.

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Statistical Model of 3D Positions in Tracking Fast Objects Using IR Stereo Camera (적외선 스테레오 카메라를 이용한 고속 이동객체의 위치에 대한 확률모델)

  • Oh, Jun Ho;Lee, Sang Hwa;Lee, Boo Hwan;Park, Jong-Il
    • Journal of the Institute of Electronics and Information Engineers
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    • v.52 no.1
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    • pp.89-101
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    • 2015
  • This paper proposes a statistical model of 3-D positions when tracking moving targets using the uncooled infrared (IR) stereo camera system. The proposed model is derived from two errors. One is the position error which is caused by the sampling pixels in the digital image. The other is the timing jitter which results from the irregular capture-timing in the infrared cameras. The capture-timing in the IR camera is measured using the jitter meter designed in this paper, and the observed jitters are statistically modeled as Gaussian distribution. This paper derives an integrated probability distribution by combining jitter error with pixel position error. The combined error is modeled as the convolution of two error distributions. To verify the proposed statistical position error model, this paper has some experiments in tracking moving objects with IR stereo camera. The 3-D positions of object are accurately measured by the trajectory scanner, and 3-D positions are also estimated by stereo matching from IR stereo camera system. According to the experiments, the positions of moving object are estimated within the statistically reliable range which is derived by convolution of two probability models of pixel position error and timing jitter respectively. It is expected that the proposed statistical model can be applied to estimate the uncertain 3-D positions of moving objects in the diverse fields.

The Image Measuring System for accurate calibration-matching in objects (정밀 켈리브레이션 정합을 위한 화상측징계)

  • Kim, Jong-Man
    • Proceedings of the Korean Institute of Electrical and Electronic Material Engineers Conference
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    • 2006.11a
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    • pp.357-358
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    • 2006
  • Accurate calibration matching for maladjusted stereo cameras with calibrated pixel distance parameter is presented. The camera calibration is a necessary procedure for stereo vision-based depth computation. Intra and extra parameters should be obtain to determine the relation between image and world coordination through experiment. One difficulty is in camera alignment for parallel installation: placing two CCD arrays in a plane. No effective methods for such alignment have been presented before. Some amount of depth error caused from such non-parallel installation of cameras is inevitable. If the pixel distance parameter which is one of Intra parameter is calibrated with known points, such error can be compensated in some amount and showed the variable experiments for accurate effects.

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Pixel Circuit with High Immunity to the Degradation of TFTs and OLED for AMOLED Displays

  • Lin, Chih-Lung;Tu, Chun-Da
    • 한국정보디스플레이학회:학술대회논문집
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    • 2008.10a
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    • pp.473-476
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    • 2008
  • A simple voltage compensation pixel circuit for AMOLED is produced using low temperature polycrystalline silicon (LTPS) technology. Its operation is verified by AIM-SPICE. Simulation results show that the pixel circuit has high immunity to variation of LTPS-TFT and reduces the drop in luminance due to the degradation of the OLED.

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Calibration of the depth measurement system with a laser pointer, a camera and a plain mirror

  • Kim, Hyong-Suk;Lin, Chun-Shin;Gim, Seong-Chan;Chae, Hee-Sung
    • 제어로봇시스템학회:학술대회논문집
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    • 2005.06a
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    • pp.1994-1998
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    • 2005
  • Characteristic analysis of the depth measurement system with a laser, a camera and a rotating mirror has been done and the parameter calibration technique for it has been proposed. In the proposed depth measurement system, the laser beam is reflected to the object by the rotating mirror and again the position of the laser beam is observed through the same mirror by the camera. The depth of the object pointed by the laser beam is computed depending on the pixel position on the CCD. There involved several number of internal and external parameters such as inter-pixel distance, focal length, position and orientation of the system components in the depth measurement error. In this paper, it is shown through the error sensitivity analysis of the parameters that the most important parameters in the sense of error sources are the angle of the laser beam and the inter pixel distance. The calibration techniques to minimize the effect of such major parameters are proposed.

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Sub-pixel Motion Compensated Deinterlacing Algorithm (부화소 단위의 움직임 정보를 고려한 순차 주사화)

  • 박민규;최종성;강문기
    • Journal of the Institute of Electronics Engineers of Korea SP
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    • v.40 no.5
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    • pp.322-331
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    • 2003
  • Advances of high-definition television(HDTV) and personal computers call for the mutual conversion between interlaced signal and progressive signal. Especially, deinterlacing which is known as an interlaced to progressive conversion has been recently required and investigated. In this paper, we propose new deinterlacing algorithm considering sub-pixel motion information. In order to reduce the error of motion estimation, we analyze the effect of inaccurate sub-pixel motion information and model it as zero-mean Gaussian noises added respectively to each low resolution image(field). The error caused by inaccurate motion information is reduced by determining regularization parameter according to the error of motion estimation in each channel. The validity of the proposed algorithm is demonstrated both theoretically and experimentally in this paper.