An Improved Framework for Backlight Scaled Images and Videos
Akhil Paulose, Lintu Liz Thomas, Rahul R Pillai, Chithra Chandran"An Improved Framework for Backlight Scaled Images and Videos", International Journal of Engineering Trends and Technology (IJETT), V22(10),488-492 April 2015. ISSN:2231-5381. www.ijettjournal.org. published by seventh sense research group
Now-a-days, the major problem found in the portable multimedia devices of today is of maintaining the image quality under various lighting conditions. The brightness of an image influences the battery capacity of a device. Reducing the backlight increases the battery life of these devices. In this paper an image enhancement algorithm is proposed that enhances an image at low backlight, by taking the human visual property into consideration. The just noticeable difference theory (JND) is applied and an image is decomposed into two layers namely, the HVS response layer and the background luminance layer. The operations of the proposed algorithm are performed in the background luminance layer so that luminance gradient reversal can be avoided. The algorithm is further extended to enhance dim backlight videos.
 Tai-Hsiang Huang, Kuang-Tsu Shih, Su-Ling yeh and Homer
h.Chen,Fellow, “Enhancement of Backlight-scaled Images,” IEEE
transactions on image processing, vol. 22, no.12, December 2013.
 H.Wilson,”A transducer function for threshold and suprathreshold human vision,” Biol.Cybern,vol.38,no.3,pp 171-178,october 1980.
 Y.Rao and L.Chen, “A survey of video enhancement techniques,”J.Inf.Multimedia Signal Process.,vol.3,no 1,pp 71- 79,Jan.2012.
 T.H Kim, K.S. Choi and S.J.Ko,”Backlight power reduction using efficient image compensation for mobile devices,”IEEE trans.Consum.Electron.,vol.56,no.3,pp.1972-1978,Aug.2010.
 L.Cheng,S.Mohatpara,M.E.Zarki,N.Dutt and N.Venkatasubramantan,”A backlight optimisation scheme for video playback on mobile devices,” in Proc.Consum.Commun.Netw.Conf.,Jan 2006,pp.833-837.
 R.Fattal,D.Lischinski,M.Werman,”Gradient domain high dyanamic range compression,”ACM Trans.Graph.,vol.21,no.3,pp.249- 256,jul.2002.
 Z.Farbman,R.fattal,D.Lischinski and R.Szeliski,”Edge-preserving decompositions for multi scale tone and detail manipulation,”,ACM Trans.Graph.,vol.27,no.3,pp.1-7,Aug.2008.
 T.-H. Huang,C.t.kao,Y.C.Chen,”A visibility model for quality assesment of dimmed images,” in Proc.4th IEEE Int.workshop multimedia Signal Process.,Sep 2012,pp.206-211.
 F.Kingdom and B.moulden,”Border effects on brightness:A review of findings ,models ans issues,”Spatial Vis.,vol no 3,no 4,pp.225-262,Aug 1988.
 A .Iranli,W.Lee and M.Pedram,”HVS –aware dyanamic backlight scaling in TFT-LCD,”IEEE Trans.Very Large Scale Integr.(VLSI) Syst.,vol.14,no.10,pp.1103-1116,Oct.2006.
 J.M Valeton and D.V Norren.”Light adaptation of primary cones:An analysis based on extracellular data,”Vis.Res.,vol.23,no 12,pp.1539- 1547,Dec.1983.
 A.Anitha and B.Rajesh Kumar, “ A new image enhancement algorithm using JND and histogram equilisation”,IJETT,volume 9 number 6 march 2014.
Backlight, JND, HVS, background luminance.