一種提高圖像對比度和視覺質量的新型區域背光算法

張濤; 巫紅英; 李蒙; 雷志春

doi:10.13374/j.issn2095-9389.2017.12.016

一種提高圖像對比度和視覺質量的新型區域背光算法

doi: 10.13374/j.issn2095-9389.2017.12.016

張濤¹,
巫紅英^1, ,,
李蒙²,
雷志春^1,3

1) 天津大學電氣自動化與信息工程學院, 天津 300072
2) 深圳華為技術有限公司, 深圳 518129
3) 魯爾西應用科學大學傳感與測量研究所, 北萊菌威斯特法倫州 45479

基金項目:

天津市科技計劃資助項目（16YFZCGX00760）；圖像視頻HDR顯示研究資助項目（2016120024000202）

詳細信息

中圖分類號: TN27;TN873
計量
- 文章訪問數: 1356
- HTML全文瀏覽量: 496
- PDF下載量: 120
- 被引次數: 0
出版歷程
- 收稿日期: 2017-03-06

A novel local dimming algorithm to improve image contrast and visual quality

1) School of Electrical Automation and Information Engineering, Tianjin University, Tianjin 300072, China
2) Shenzhen Huawei Technology Co., Ltd., Shenzhen 518129, China
3) Institute of Sensing and Measurement, University of Applied Sciences Ruhr West, North Rhine-Westphalia 45479, Germany

摘要

摘要: 為盡可能高地提高液晶顯示器（LCD）的動態范圍以實現高動態范圍顯示，提出了一種基于動態閾值背光亮度提取和液晶像素補償兩步法的區域背光算法，以提高液晶顯示器背光模組和液晶面板的動態范圍，從而使調光后圖像的對比度和視覺質量都得到增強.仿真結果表明，用該算法區域調光后圖像的對比度平均提高了113.60%.此外，用自主研發的直下式白光LED分區背光液晶顯示樣機通過顯示具體圖像對所提出算法進行性能測試，顯示結果表明區域調光后圖像的層次和色彩得到了增強且提高了對比度，證明了所提出算法能有效提高液晶顯示器的對比度并改善顯示畫質.
- 高動態范圍 /
- 區域背光 /
- 背光亮度 /
- 像素補償 /
- 對比度
Abstract: With the emergence of high dynamic range (HDR) images and videos, improving the liquid crystal display (LCD) technology has become an urgent requirement. The development of HDR display systems is becoming the focus of research in the display technology. To improve the dynamic range of LCDs to the best possible extent, a local dimming algorithm based on dynamicthreshold backlight luminance extraction and two-step liquid crystal pixel compensation was proposed to improve the dynamic range of a backlight model and an LCD panel, thereby enhancing the contrast and visual quality of the dimmed image. The experimental results demonstrate that the proposed algorithm can improve the image contrast ratio by approximately 113.60% on average. Additionally, on the direct white light-emitting diode backlight LCD, specific images were used to verify the accuracy of the proposed algorithm. The display effects indicate that the layering and color of dimmed images are enhanced and the image contrast ratio is improved. Based on these results, it can be concluded that the proposed algorithm can effectively improve both the contrast of LCDs and the display quality.
- high dynamic range /
- local dimming /
- backlight luminance /
- pixel compensation /
- contrast ratio

HTML全文

參考文獻(16)

[1]	Zhao H, Shi B X, Christy F C, et al. Unbounded high dynamic range photography using a modulo camera//IEEE International Conference on Computational Photography. Houston, 2015:1
[2]	Seetzen H, Heidrich W, Stuerzlinger W, et al. High dynamic range display systems. ACM Trans Graph, 2004, 23(3):760
[3]	Liu Y H, Yang Z Z, Wang S C. A novel sequential color RGB-LED backlight driving system with local dimming control and dynamic bus voltage regulation. IEEE T Consum Electron, 2010, 56(4):2445
[4]	Oh W S, Cho D, Cho K M, et al. A novel two-dimensional adaptive dimming technique of X-Y channel drivers for LED backlight system in LCD TVs. J Disp Technol, 2009, 5(1):20
[5]	Funamoto T, Kobayashi T, Murao T. High-picture-quality technique for LCD televisions:LCD-AI//Proceedings of the 7th International Display Workshops (IDW00). Kobe, 2000:1157
[7]	Lin F C, Huang Y P, Liao L Y, et al. Dynamic backlight gamma on high dynamic range LCD TVs. J Disp Technol, 2008, 4(2):139
[8]	Cho H, Kwon O K. A backlight dimming algorithm for low power and high image quality LCD applications. IEEE T Consum Electon, 2009, 55(2):839
[9]	Nadernejad E, Burini N, Korhonen J, et al. Adaptive local backlight dimming algorithm based on local histogram and image characteristics. SPIE-IS & T, 2013, 8652:86520V-1
[10]	Cho H, Cho B C, Hong H J, et al. A color local dimming algorithm for liquid crystals displays using color light emitting diode backlight systems. Opt Laser Technol, 2013, 47:80
[11]	Cha S, Choi T, Lee H, et al. An optimized backlight local dimming algorithm for edge-lit LED backlight LCDs. J Disp Technol, 2015, 11(4):378
[12]	Guarnieri G, Marsi S, Ramponi G. High dynamic range image display with halo and clipping prevention. IEEE T Image Process, 2011, 20(5):1351
[15]	Lai C C, Tsai C C. Backlight power reduction and image contrast enhancement using adaptive dimming for global backlight application. IEEE T Consum Electon, 2008, 54(2):669
[16]	Huang W, Jin Z L, Zhong Z G, et al. A novel local dimming algorithm for RGB-LED backlight. Proc SPIE, 2009, 7509:750903-1
[17]	Lin F C, Liao C Y, Liao L Y, et al. Inverse of mapping function (IMF) method for image quality enhancement of high dynamic range LCD TVs. SID, 2007, 38(1):1343
[18]	Liao L Y, Huang Y P. Blur-mask approach for real-time calculation of light spreading function (LSF) on spatial modulated high dynamic range LCDs. J Disp Technol, 2010, 6(4):121
[22]	Shu X, Wu X L, Forchhammer S. Optimal local dimming for LC image formation with controllable backlighting. IEEE T Image Process, 2013, 22(1):166