GPU-Based Local-Dimming for Power Efficient Imaging

Chihao Xu, Michael Krause, Jens Kruger
Saarland University
Technical Briefs Proceedings ACM SIGGRAPH Asia, 2012

   title={GPU-based local-dimming for power efficient imaging},

   journal={Proc. SIGGRAPH Asia 2012, Technical Briefs},






   booktitle={Technical Briefs Proceedings ACM SIGGRAPH Asia 2012},


   event_name={SIGGRAPH Asia},



   author={Xu, Chihao and Krause, Michael and Kr{"u}ger, Jens}


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This paper describes a local dimming method for reducing the power consumption of LCD monitors. Reducing this load is of ever growing importance as it is getting the dominant power consumer of mobile computing. As a side effect, our method does not only significantly reduce the power consumption but also improves the visual quality (see Figure 1). To implement our algorithm using a minimum in new hardware components, we propose to utilize the parallel power of the graphics processing units (GPUs) as found in any of today’s PCs, notebooks, or mobile devices. Our approach generates individual values of LED strings for backlighting the LCD panel and an image for controlling the TFT-pixels. For this purpose a specific local dimming algorithm called Sorted Sector Covering (SSC), which considers the Edge-Lit structure of LCD monitors, has been implemented on both the GPU and the CPU. The procedure allows for high video frame rates. We demonstrate that the static contrast is increased yielding to a better visual quality, while the power consumption is significantly reduced.
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