Frame layer CBR encoding to reduce large picture quality fluctuation

Hoonjae Lee, Taehyeon Choi, Sanghoon Sull

Research output: Contribution to journalArticlepeer-review

3 Citations (Scopus)


Constant bit-rate (CBR) encoding methods used for the real-time digital video applications such as terrestrial high definition television (HDTV) broadcasting often produce large picture quality fluctuation due to constraints on buffer size and buffering delay. In this paper, we propose a simple framelayer CBR encoding method which reduces large picture quality fluctuation of an encoded video under constant bit-rate and limited buffer size. We first define an intermediate encoder buffer level to be lower than the half of the maximum encoder buffer level. Then, the encoder buffer level is kept from being close to the maximum (or minimum) buffer level during encoding by slightly decreasing (or increasing) the number of bits estimated to encode each frame if the resulting buffer level becomes higher (or lower) than the intermediate buffer level. The experimental results show that the proposed CBR encoding method reduces the average local PSNR variation by 20.6% compared with previous CBR encoding method on average under constant bit-rate and limited buffer size.

Original languageEnglish
Article number6311352
Pages (from-to)1031-1037
Number of pages7
JournalIEEE Transactions on Consumer Electronics
Issue number3
Publication statusPublished - 2012

Bibliographical note

Funding Information:
1This research was supported by Basic Science Research Program through the National Research Foundation of Korea (NRF) funded by the Ministry of Education, Science and Technology (No. 2011-0027328).


  • Constant bit rate (CBR)
  • overflow
  • picture qualityfluctuation
  • rate control
  • underflow
  • video encoding

ASJC Scopus subject areas

  • Media Technology
  • Electrical and Electronic Engineering


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