张涛等：一种提高图像对比度和视觉质量的新型区域背光算法 *1897· 效地提高调光后图像的对比度并提升视觉质量 [11]Cha S,Choi T,Lee H,et al.An optimized backlight local dim- (3)通过测试四种不同场景类型的图像，本文算 ming algorithm for edge-it LED backlight LCDs.Disp Technol, 2015,11(4):378 法均能有效地提高图像对比度和显示效果，这说明本 12] Guamieri G,Marsi S,Ramponi G.High dynamic range image 文算法适用性广. display with halo and clipping prevention.IEEE T Image (4)通过具体图像在样机上进行实测，发现样机 Process,2011,20(5):1351 的峰值亮度有较大程度的提高，且由于降低了背光泄 [13]Zhang X B,Liu X,Liu B,et al.A control algorithm of LCD dy- 漏使得黑色性能得到了改善，这说明本文算法确实可 namic backlight based on PSNR.Opto-Elec Eng,2012,39 (8): 以有效提高液晶显示器的动态范围. 129 (章小兵，刘欣，刘波，等.基于PSNR的LCD区域动态背光 调节方法.光电工程，2012,39(8)：129) 参考文献 [14]Zhang X B,Wang HH.A control algorithm of LCD dynamic Zhao H,Shi B X.Christy FC,et al.Unbounded high dynamie backlight based on dynamic threshold.Opto-Elec Eng,2013,40 range photography using a modulo camera /IEEE International (3):75 Conference on Computational Photography.Houston.2015:1 (章小兵，汪海红.基于动态值的液晶显示器动态背光控 2]Seetzen H,Heidrich W,Stuerzlinger W,et al.High dynamic 制方法.光电工程，2013,40(3)：75) range display systems.ACM Trans Graph,2004,23(3):760 [15]Lai CC,Tsai C C.Backlight power reduction and image contrast B]Liu Y H,Yang ZZ,Wang S C.A novel sequential color RGB- enhancement using adaptive dimming for global backlight applica- LED backlight driving system with local dimming control and dy- tion.IEEE T Consum Electon,2008,54(2)669 namie bus voltage regulation.IEEE T Consum Electron,2010,56 [16J Huang W,Jin Z L,Zhong ZG,et al.A novel local dimming al- (4):2445 gorithm for RGB-LED backlight.Proc SPIE,2009,7509: [4]Oh W S.Cho D,Cho K M,et al.A novel two-dimensional adap- 7509031 tive dimming technique of X-Y channel drivers for LED backlight [17]Lin F C,Liao C Y,Liao L Y,et al.Inverse of mapping function system in LCD TVs.J Disp Technol,2009,5(1):20 (IMF)method for image quality enhancement of high dynamic [5]Funamoto T,Kobayashi T,Murao T.High-picture-quality tech- range LCD TVs.S/D,2007,38(1):1343 nique for LCD televisions:LCD-Al//Proceedings of the 7th Inter- [18]Liao L Y,Huang Y P.Blur-mask approach for real-time calcula- national Display Workshops (IDW00).Kobe,2000:1157 tion of light spreading function (ISF)on spatial modulated high 6]Liu YZ.Zheng X R.Chen J B.Dynamic backlight signal extrac- dynamic range LCDs.J Disp Technol,2010.6(4):121 tion algorithm based on threshold of image CDF for LCD-TV and [9]Zhang X T.Local Dimming Algorithm for Direct-Lit Type LED its hardware implementation.Chin I Lig Crys Disp,2010,25 Backlight in LCD TVs [Dissertation].Hefei:Hefei University of (3):449 Technology,2015 (刘艳中，郑学仁，陈建宾.基于图像CDF阅值的LCD-TV动 (张喜条.液品电视LED背光直下区域调光算法研究[学位 态背光主亮度提取算法及其硬件实现.液品与显示，2010， 论文].合肥：合肥工业大学，2015) 25(3):449) 0]Xiang Y,Feng Q B.Li G Q.Dynamic dimming algorithm in ]Lin FC,Huang Y P,Liao L Y,et al.Dynamic backlight gamma on side-it LED backlights.Chin J Lig Crys Disp,2014,29 (2) high dynamic range LCD TVs.J Disp Technol,2008,4():139 293 Cho H,Kwon O K.A backlight dimming algorithm for low power (向艳，冯奇斌，吕国强.侧出LED背光动态调光算法研究 and high image quality LCD applications.IEEE T Consum Elec- 液品与显示，2014,29(2)：293) tom,2009,55(2):839 21]Zhang L,Li G Q.Han D,et al.An improved Sshaped curve 9]Nadernejad E,Burini N,Korhonen J,et al.Adaptive local back- global dimming algorithm.Opto-Elec Eng,2014,41(11):51 light dimming algorithm based on local histogram and image char- (张磊，吕国强，韩东，等.改进的S形曲线全局动态调光算 acteristics.SP/E-IS T,2013,8652:86520V- 法.光电工程，2014,41(11)：51) [10]Cho H,Cho B C,Hong H J,et al.A color local dimming algo- [22]Shu X,Wu X L,Forchhammer S.Optimal local dimming for LC rithm for liquid crystals displays using color light emitting diode image formation with controllable backlighting.IEEE T Image backlight systems.Opt Laser Technol,2013,47:80 Process,2013,22(1):166张 涛等: 一种提高图像对比度和视觉质量的新型区域背光算法 效地提高调光后图像的对比度并提升视觉质量． ( 3) 通过测试四种不同场景类型的图像，本文算 法均能有效地提高图像对比度和显示效果，这说明本 文算法适用性广． ( 4) 通过具体图像在样机上进行实测，发现样机 的峰值亮度有较大程度的提高，且由于降低了背光泄 漏使得黑色性能得到了改善，这说明本文算法确实可 以有效提高液晶显示器的动态范围． 参 考 文 献 ［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 dy￾namic 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 adap￾tive 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 tech￾nique for LCD televisions: LCD--AI / / Proceedings of the 7th Inter￾national Display Workshops ( IDW00) ． Kobe，2000: 1157 ［6］ Liu Y Z，Zheng X Ｒ，Chen J B． Dynamic backlight signal extrac￾tion algorithm based on threshold of image CDF for LCD--TV and its hardware implementation． Chin J Liq Crys Disp，2010，25 ( 3) : 449 ( 刘艳中，郑学仁，陈建宾． 基于图像 CDF 阈值的 LCD--TV 动 态背光主亮度提取算法及其硬件实现． 液晶与显示，2010， 25( 3) : 449) ［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 Elec￾ton，2009，55( 2) : 839 ［9］ Nadernejad E，Burini N，Korhonen J，et al． Adaptive local back￾light dimming algorithm based on local histogram and image char￾acteristics． SPIE--IS ＆ T，2013，8652: 86520V-1 ［10］ Cho H，Cho B C，Hong H J，et al． A color local dimming algo￾rithm 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 dim￾ming 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 ［13］ Zhang X B，Liu X，Liu B，et al． A control algorithm of LCD dy￾namic backlight based on PSNＲ． Opto-Elec Eng，2012，39( 8) : 129 ( 章小兵，刘欣，刘波，等． 基于 PSNＲ 的 LCD 区域动态背光 调节方法． 光电工程，2012，39( 8) : 129) ［14］ Zhang X B，Wang H H． A control algorithm of LCD dynamic backlight based on dynamic threshold． Opto-Elec Eng，2013，40 ( 3) : 75 ( 章小兵，汪海红． 基于动态阈值的液晶显示器动态背光控 制方法． 光电工程，2013，40( 3) : 75) ［15］ Lai C C，Tsai C C． Backlight power reduction and image contrast enhancement using adaptive dimming for global backlight applica￾tion． IEEE T Consum Electon，2008，54( 2) : 669 ［16］ Huang W，Jin Z L，Zhong Z G，et al． A novel local dimming al￾gorithm 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 calcula￾tion of light spreading function ( LSF) on spatial modulated high dynamic range LCDs． J Disp Technol，2010，6( 4) : 121 ［19］ Zhang X T． Local Dimming Algorithm for Direct-Lit Type LED Backlight in LCD TVs［Dissertation］． Hefei: Hefei University of Technology，2015 ( 张喜条． 液晶电视 LED 背光直下区域调光算法研究［学位 论文］． 合肥: 合肥工业大学，2015) ［20］ Xiang Y，Feng Q B，Lü G Q． Dynamic dimming algorithm in side-lit LED backlights． Chin J Liq Crys Disp，2014，29 ( 2) : 293 ( 向艳，冯奇斌，吕国强． 侧出 LED 背光动态调光算法研究． 液晶与显示，2014，29( 2) : 293) ［21］ Zhang L，Lü G Q，Han D，et al． An improved S-shaped curve global dimming algorithm． Opto-Elec Eng，2014，41( 11) : 51 ( 张磊，吕国强，韩东，等． 改进的 S 形曲线全局动态调光算 法． 光电工程，2014，41( 11) : 51) ［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 · 7981 ·