A cross-layer framework for efficient streaming of H.264 video over IEEE 802.11 networks
Journal of Computer Systems, Networks, and Communications
Down-sampling design in DCT domain with arbitrary ratio for image/video transcoding
IEEE Transactions on Image Processing
A fast arbitrary-ratio downscaling algorithm for video transcoding
SIP '07 Proceedings of the Ninth IASTED International Conference on Signal and Image Processing
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In order to transmit the precoded bit stream through bandwidth constrained network, transcoding technique has been introduced to reduce the overall bit rate generated. Downsizing transcoding is one of the commonly used methods since it can reach very low bit rate without losing any motion information. Many efforts have been devoted to this research area. With the proposal of arbitrary downsizing, fine gradual reduction of bit rate and video quality becomes feasible. However, there is little research focusing on frame size selection for arbitrary downsizing transcoding. In this letter, the realization of arbitrary downsizing transcoding is discussed. Rate estimation scheme is applied on video sequences to choose the suitable frame size for the target bit rate. An efficient method is proposed to estimate the number of bits allocated to residue in requantization process. Experimental results show that, it can provide an accurate estimation and make a reliable decision in frame size selection.