Differential illumination of regions of interest for power efficient video playback

This paper describes a method to optimize the power needed to display a video by better illuminating the regions of interest compared to the rest of the video. This method identifies the regions of interest by utilizing parameters from the digital video codecs. It also employs temporal and spatial filters to improve perceptual quality of the video. For our experiment we used MPEG-2 encoded video bitstream and used its motion vectors for identifying the regions of interest, and the results show that the regions of interest are better highlighted in comparison to uniformly scaled illumination for similar power savings. In addition, the method has very low complexity of 0.5 MIPS and low memory footprint of 3 KiloBytes only, so it does not add substantial overhead to the computational complexity of the system as well.