Proxy-based approaches for IDCT acceleration

In the boundary between wired and wireless worlds, proxy-based processing has been recognized as an efficient approach to provide client-specific adaptation to improve the overall performance. For the portable video decoding devices with wireless access ability, fast, low-power decoding is desirable. In this paper, we propose a novel proxy-based framework that is capable of accelerating the IDCT operations performed at the client. We introduce a proxy-specific IDCT algorithm that is not only suitable for the proxy framework, but has fine-grained complexity scalability as well. We then demonstrate the effectiveness of the proxy by two examples. The first example is a simple proxy that is assigned the task of IDCT block classification, which is performed at the client along with the IDCT operation conventionally. Experimental results clearly show the complexity advantage of this method. The second example is a more active proxy. Adaptation to the image statistics is introduced. Simulations of the optimization process based on the average complexity criteria show that the client complexity can be further reduced, while maintaining a low side information overhead. Both examples provide the trade-off between the client-proxy bandwidth increment and the IDCT complexity reduction at the client.