Source model for transform video coder and its application - Part II: Variable frame rate coding

Jiann Jone Chen*, Hsueh-Ming Hang

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

37 Scopus citations


In the first part of this paper, we derive a source model describing the relationship between bits, distortion, and quantization step size for transform coders. Based on this source model, a variable frame rate coding algorithm is developed. The basic idea is to select a proper picture frame rate to ensure a minimum picture quality for every frame. Because our source model can predict approximately the number of coded bits when a certain quantization step size is used, we could predict the quality and bits of coded images without going through the entire real-coding process. Therefore, we could skip the right number of picture frames to accomplish the goal of constant image quality. Our proposed variable frame rate coding schemes are simple but quite effective as demonstrated by simulation results. The results of using another variable frame rate scheme, Test Model for H.263 (TMN-5), and the results of using a fixed frame rate coding scheme, Reference Model 8 for H.261 (RM8), are also provided for comparison.

Original languageEnglish
Pages (from-to)299-311
Number of pages13
JournalIEEE Transactions on Circuits and Systems for Video Technology
Issue number2
StatePublished - 1 Dec 1997


  • Image coding
  • Rate distortion theory
  • Source coding

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