Title :
Rate control in heterogeneous transcoder
Author :
Guo Ying ; Guiling, Li ; Yu, Liu
Author_Institution :
Inst. of Electron. & Inf. Eng., Tianjin Univ., China
fDate :
31 Aug.-4 Sept. 2004
Abstract :
This paper introduces an adaptive rate control algorithm in the heterogeneous video transcoding. First, quite a few I-frames which occupy many bits in pre-encoded MPEG-2 video stream be considered. Perceptual redundancies can be removed from I-frame. if we utilize psychovisual properties of the human visual system (HVS). Second, the course of transcoding can be completed by DCT coefficients requantized. We substitute a bit estimation model in the frequency domain for the model in the spatial domain, which needn´t IDCT and DCT. Experimental results show that the proposed algorithm improves transcoding efficiency and image quantity.
Keywords :
adaptive codes; discrete cosine transforms; frequency-domain analysis; transcoding; video coding; DCT coefficient; HVS; adaptive rate control algorithm; bit estimation model; discrete cosine transforms; frequency domain analysis; heterogeneous video transcoding; human visual system; perceptual redundancy; pre-encoded MPEG-2 video stream; Adaptive control; Discrete cosine transforms; Frequency domain analysis; Frequency estimation; Humans; Programmable control; Psychology; Streaming media; Transcoding; Visual system;
Conference_Titel :
Signal Processing, 2004. Proceedings. ICSP '04. 2004 7th International Conference on
Print_ISBN :
0-7803-8406-7
DOI :
10.1109/ICOSP.2004.1441543