Browse > Article

TFT-LCD Defect Enhancement Using Frequency Sensitivity of HVS  

Oh, Jong-Hwan (Dept. of Electrical Engineering, Kyungpook National University)
Park, Kil-Houm (Dept. of Electrical Engineering, Kyungpook National University)
Publication Information
Journal of the Institute of Electronics Engineers of Korea SP / v.44, no.5, 2007 , pp. 20-27 More about this Journal
Abstract
Generally, the TFT-LCD image signal have nonuniform brightness and are composed of largely varying background signal, noise signal and abruptly changing Mura signal within Mura region. In this paper, Mura region enhancing algorithms using the proposed modified-MTF, which describes how human-visual-system's sensitivity varies in frequency domain, is proposed. The validity of the proposed algorithm was demonstrated ideal 1-dimensional signal and also then it was also tested TFT-LCD image. By the experimental results, the proposed algorithm is very effective in TFT-LCD image Mura enhancement.
Keywords
Computer Vision; HVS; MTF; CSF(contrast sensitivity function); TFT-LCD;
Citations & Related Records
연도 인용수 순위
  • Reference
1 J. H. Oh, D. M. Kwak, K. B. Lee, Y. C. Song, D. H. Choi, and K. H. Park, 'Line defect detection in TFT-LCD using directional filter bank and adaptive multilevel thresholding,' Key Engineering Materials, vol. 270-273, pp. 233-238, 2004
2 G. B. Lee, C. G. Lee, S. Y. Kim, and K. H. Park, 'Adative surface fitting for inspection of FPD devicess uing multilevel B-spline approximation,' 21st International Technical Conference on Circuits/Systems, Computers and Communications vol. 2, pp. 205-208, 2006
3 Kaznutaka Tanigucchi, Kunio Ueta, and Shoji Tatsumi, 'A detection method of mura on a coated layer using interference light,' 2006 IEEE Internationnal Conference on System, Man, and Cybernetics, pp. 5047-5052, Oct. 2006
4 J.L. Mannos and D.J. Sakrison, 'The effects of a visual fidelity criterion on the encoding of images,' IEEE Transactions on Information Theory, vol. 20, no. 4, pp. 525-536, July 1974   DOI
5 A. Gaddipatti, R. Maciraju, and Roni Yagel, 'Steering image generation with wavelet based perceptual metric,' Computer Graphic Forum, vol. 16, no. 3, pp. 241-251, 1997   DOI
6 Rafael C. Gonzalez, Richard E. Woods 'Digital Image Processing second edition', pp. 363 - 372, 2002
7 J. Jang, S. K. Lim, and M. H. Oh, 'Technology development and production of flat panel displays in Korea,' Proceedings of the IEEE. vol. 90, no. 4, pp. 501-513, 2002   DOI   ScienceOn
8 S. I. Baek, W. S. Kim, T. M. Koo, I. Choi, and K. H. Park, 'Inspection of defect on LCD panel using polynomial approximation,' TENCON 2004, vol. A 21-24, pp. 235-238, Nov. 2004
9 VESA Flat Panel Display Measurements Standard Ver 2.0, June 1, 2001
10 Selig Hecht, 'The visual discrimination of intensity and the Weber-Fechner law,' Journal of General Physiology, vol. 7, pp. 235-267, Sep. 1924   DOI