Backlight dimming is a dominant method for power reduction in LCDs. Image processing with a simple boost and clip can compensate for such dimming‐restoring image brightness. We propose a low complexity approach which replaces hard clipping with smooth roll‐off to reduce clipping artifacts. An additional high‐quality approach uses a two‐channel spatial‐frequency decomposition to preserve highlight detail attenuated by the roll‐off. Image quality is improved and power savings can be increased by more‐aggressive backlight dimming.
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Kerofsky et al. (2006) studied this question.
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