Realtime video coding under power constraint based on H.264 codec In this paper, we propose a joint powerdistortion optimization scheme for realtime H.264 video encoding under the power constraint. Firstly, the power constraint is translated to the complexity constraint based on DVS technology. Secondly, a computation allocation model (CAM) with virtual buffers is proposed to facilitate the optimal allocation of constrained computational resource for each frame. Thirdly, the complexity adjustable encoder based on optimal motion estimation and mode decision is proposed to meet the allocated resource. The proposed scheme takes the advantage of some new features of H.264AVC video coding tools such as early termination strategy in fast ME. Moreover, it can avoid suffering from the high overhead of the parametric power control algorithms and achieve fine complexity scalability in a wide range with stable ratedistortion performance. The proposed scheme also shows the potential of a further reduction of computation and power consumption in the decoding without any change on the existing decoders.

Achieving H.264like compression efficiency with distributed video coding Recently, a new class of distributed source coding (DSC) based video coders has been proposed to enable lowcomplexity encoding. However, to date, these lowcomplexity DSCbased video encoders have been unable to compress as efficiently as motioncompensated predictive coding based video codecs, such as H.264AVC, due to insufficiently accurate modeling of video data. In this work, we examine achieving H.264like high compression efficiency with a DSCbased approach without the encoding complexity constraint. The success of H.264AVC highlights the importance of accurately modeling the highly nonstationary video data through finegranularity motion estimation. This motivates us to deviate from the popular approach of approaching the WynerZiv bound with sophisticated capacityachieving channel codes that require long block lengths and high decoding complexity, and instead focus on accurately modeling video data. Such a DSCbased, compressioncentric encoder is an important first step towards building a robust DSCbased video coding framework.