Discrete-time signal processing (2nd ed.)
Discrete-time signal processing (2nd ed.)
Rate control algorithm for fast bit-rate conversion transcoding
IEEE Transactions on Consumer Electronics
An HDTV-to-SDTV spatial transcoder
IEEE Transactions on Circuits and Systems for Video Technology
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When the bit rate of a compressed video sequence is reduced by a frequency domain transcoder system, the rate control scheme plays a very important role in maintaining consistent video quality. In this paper, we propose an efficient rate control scheme based on the complexity of MB (Macro Block) while conventional transcoding schemes use that of a picture. Since the frequency domain transcoder has to calculate the spatial activity of MB to adjust the quantization step, a process of converting the DCT (Discrete Cosine Transform) data into spatial one is required. The proposed scheme calculates the spatial activity from DCT data without converting them to pixel domain.