資源描述:
《一種基于圖像色貌模型和分層模型的色調(diào)映射算法-論文.pdf》由會員上傳分享,免費在線閱讀,更多相關內(nèi)容在行業(yè)資料-天天文庫。
1、光電字·澈第24卷第4期2013年4月JournalofOptoelectronics·LaserVo1.24No.4April2013一種基于圖像色貌模型和分層模型的色調(diào)映射算法肖進勝,李佩,易本順,白佳樂,賈茜(1.武漢大學電子信息學院,湖北武漢430072;2.中國工商銀行軟件開發(fā)中心杭州研發(fā)支持部,浙江杭州310000)摘要:針對目前高動態(tài)范圍(HDR,highdynamicrange)圖像色調(diào)映射算法存在效率低、效果欠佳的問題,提出了一種基于色貌模型和分層模型的色調(diào)映射算法。首先,通過將
2、高斯核離散化的方法加快雙邊濾波;其次,在RGB空間階調(diào)壓縮解決偏色問題;最后,對Stevens效應下的細節(jié)層增強效果進行調(diào)整并對色彩飽和度增強,使映射后的圖像細節(jié)豐富,更加逼真。對比經(jīng)典算法,不同場景的大量實驗結(jié)果顯示,主觀質(zhì)量和客觀指標均有所提高,與原始算法相比,本算法計算效率提高了6倍以上,圖像的熵平均提高0.046,清晰度平均提高0.159,邊緣保持度平均提高1.811。在主觀效果上,減少了偏色和光暈等現(xiàn)象,同時細節(jié)表現(xiàn)更清晰,色彩更豐富自然,分析表明,本文提出的色調(diào)映射算法在高效、高視覺質(zhì)
3、量顯示方面具有明顯的優(yōu)勢,可用于高級圖像編輯、顯示設備開發(fā)領域。關鍵詞:色調(diào)映射;高動態(tài)范圍(HDR);快速雙邊濾波;色貌模型;分層模型中圖分類號:TP391.41文獻標識碼:A文章編號:1005—0086(2013)04—0812—08Atonemappingalgorithmbasedonimagecolorappearancemodelandhierarchicalmode1ⅪA0Jin-shengh,LIPei,YIBen-shun1,BAIJia-le2,JIAQianI(1.Schoo
4、lofElectronicInformation,WuhanUniversity,Wuhan430072,China;2.HangzhouResearchandDevelop—mentSupportDepartment,SoftwareDevelopmentCenterofICBC,Hangzhou310000,China)Abstract:Inviewofthatthepresenthighdynamicrange(HDR)imageStonemappingalgorithmsareinlowe
5、fficiencyandpooreffect,atonemappingalgorithmbasedonColorappearance、modelandhierarchi—calmodelisproposedinthispaper.Firstly,thebilateralfilterisspeededupbyusingdiscreteGaussiankerne1.Secondly,tosolvethecolorcastproblem,thetonecompressionisprocessedinRG
6、BcolorspaceinsteadofHPEcolorspace.Finally,thedetaillayerSeffectisadjustedintheStevenseffect.Inaddition,thecolorsaturationisenhancedforpresentingmoredetailsandmorerealappearanceintheimageaftertonemapping.Comparedwithclassicalalgorithms,plentyofexperime
7、ntalresultsshowthatthealgo—rithmproposedinthispaperperformsbestintermsofvisualqualityandobjectiveindicators.Comparedwiththeoriginalalgorithm,itimprovestheefficiencybymorethan6times,theimageentropybyanav—erageof0.046,theimagedefinitionbyanaverageof0.15
8、9andtheedgekeepingdegreebyanaverageof1.811.Subjectively,itreducesthecolorcastandhalos.Thedetailsappearmoreclearlyandthecolorismorerichandnaturalaswel1.Theanalysisindicatesthatthetonemappingalgorithmproposedinthispaperhasobviousadvantagesinhigh