Sorted Sector Covering Combined with Image Condensation-An Efficient Method for Local Dimming of Direct-Lit and Edge-Lit LCDs

Flicker reduction in LED-LCDs with local backlight

“…The algorithms were Albrecht's algorithm [6], Cho's algorithm [5], Zhang's algorithm [4], Nadernejad's algorithm [1] and the optimization algorithm [2], [11]. For Albrechts algorithm [6], we have implemented the first two steps (out of three, the third one being optional), which produces a clipper-free result. Two versions of the optimization algorithm were implemented [11].…”

“…Some algorithms use characteristic data of the target image [1], [4], [5], while more complex use the information of the Point Spread Function (PSF) to model light diffusion [2], [3], [6], [7]. By using these algorithms, LCDs achieves high contrast ratio and low power consumption.…”

Subjective comparison of brightness preservation methods for local backlight dimming displays

“…There are algorithms aiming at clipping free image presentation [1], but most algorithms allow some clipping in order to find a trade-off between clipping and leakage artifacts [2,12]. Backlight dimming algorithms can be categorized to feature isLaef peau FU622 mae laasf pua[,IfU622 i9Lasi based and optimization based algorithms.…”

“…In many typical real-life images there may be bright and dark pixels located close to each other, and since the backlight intensity tends to be very smooth, a compromise between light leakage in dark pixels and reduced intensity of bright pixels (clipping) is often needed. This makes local backlight dimming a very challenging optimization problem [1][2].…”

“…To date, scientific research in local backlight dimming has mainly focused on algorithms determining the backlight levels [1][2][3]. Some of those algorithms have been evaluated via subjective comparisons, in addition to objective measures of distortion [4], but we are not aware of any prior subjective quality assessment studies comparing techniques for brightness preservation (in some sources, the term "pixel compensation" is used instead) in local backlight dimming displays.…”