Abstract
Local backlight dimming technology is a two-fold improvement for LED backlit LCD screens
that allows to reduce power consumption and increase visual quality. This paper presents a fast
version of an iterative backlight dimming algorithm based on gradient descent search. The speed is
increased by exploiting the local uniformity of backlight to reduce the complexity for determining
the optimal backlight of a given image. The algorithm is adapted to video sequences by using the
backlight of the previous frame as a starting point to calculate the backlight for the current
frame. Fast variations of backlight dimming over time can produce a visually annoying flicker
artifact. To avoid this artifact, a control mechanism is also proposed.
© 2013 IEEE
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