HEBS: Histogram Equalization for Backlight Scaling
Proceedings of the conference on Design, Automation and Test in Europe - Volume 1
Energy-Efficient Color Approximation for Digital LCD Interfaces
ICCD '05 Proceedings of the 2005 International Conference on Computer Design
Image enhancement for backlight-scaled TFT-LCD displays
IEEE Transactions on Circuits and Systems for Video Technology
Interframe bus encoding technique and architecture for MPEG-4 AVC/H.264 video compression
IEEE Transactions on Very Large Scale Integration (VLSI) Systems
HVS-aware dynamic backlight scaling in TFT-LCDs
IEEE Transactions on Very Large Scale Integration (VLSI) Systems
Exploiting cross-channel correlation for energy-efficient LCD bus encoding
PATMOS'05 Proceedings of the 15th international conference on Integrated Circuit and System Design: power and Timing Modeling, Optimization and Simulation
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This paper presents a low-power encoding technique, called chromatic encoding, for the digital visual interface standard (DVI), a digital serial video interface. Chromatic encoding reduces power consumption by minimizing the transition counts on the DVI. This technique relies on the notion of tonal locality, i.e., the observation - first made in this paper - that the signal differences between adjacent pixels in images follow a Gaussian distribution. Based on this observation, an optimal code assignment is performed to minimize the transition counts. Furthermore, the three-color channels of the DVI may be reciprocally encoded to achieve even more power saving. The idea is that given the signal values from the three-color channels, one or two of these channels are encoded by reciprocal differences with a number of redundant bits used to indicate the selection. The channel selection problem is formulated as a minimum spanning tree problem and solved accordingly. The proposed technique requires only three redundant bits for each 24-bit pixel. Experimental results show up to a 75% power reduction in the DVI.