Efficient Rate Control Scheme Using Complexity of Macro Block for MPEG-2 Transcoder

Sang-Min KWAK  Jae-Gon KIM  Jong-Ki HAN  

IEICE TRANSACTIONS on Information and Systems   Vol.E90-D   No.8   pp.1316-1319
Publication Date: 2007/08/01
Online ISSN: 1745-1361
DOI: 10.1093/ietisy/e90-d.8.1316
Print ISSN: 0916-8532
Type of Manuscript: LETTER
Category: Image Processing and Video Processing
transcoder,  MPEG-2,  rate control,  

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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.