Fast thumbnail generation in integer DCT domain for H.264/AVC

Myounghoon Kim, Hoonjae Lee, Sanghoon Sull

Research output: Contribution to journalArticlepeer-review

5 Citations (Scopus)


In this paper, we propose a simple and efficient method for generating a thumbnail or 1/4 reduced-size image in integer Discrete Cosine Transform (DCT) domain for H.264/AVC video streams. To accomplish this, we first obtain the integer DCT coefficients of a prediction residual using a newly-defined re-scaling operation of inverse quantization, and then perform a transform domain intra prediction in integer DCT domain through simplified matrix multiplication by using only shift operation and integer addition. Finally, we generate a thumbnail directly from a H.264/AVC intra frame. Experimental results demonstrate that the proposed algorithm can reduce the total computational complexity about 16% on average, while maintaining almost the same image quality as compared to the existing method.

Original languageEnglish
Article number5955196
Pages (from-to)589-596
Number of pages8
JournalIEEE Transactions on Consumer Electronics
Issue number2
Publication statusPublished - 2011 May


  • 1/4 reduced-size image
  • H.264/AVC
  • intra frame
  • thumbnail
  • transform domain intra prediction

ASJC Scopus subject areas

  • Media Technology
  • Electrical and Electronic Engineering


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