Diagonal Discrete Cosine Transforms for Image Coding

  • Jingjing Fu
  • Bing Zeng
Part of the Lecture Notes in Computer Science book series (LNCS, volume 4261)


A new block-based DCT framework has been developed recently in[1] in which the first transform may choose to follow a direction other than the vertical or horizontal one – the default direction in the conventional DCT. In this paper, we focus on two diagonal directions because they are visually more important than other directions in an image block (except the vertical and horizontal ones). Specifically, we re-formulate the framework of two diagonal DCTs and use them in combination with the conventional DCT. We will discuss issues such as the directional mode selection and the cross-check of directional modes. Some experimental results are provided to demonstrate the effectiveness of our proposed diagonal DCT’s in image coding applications.


Discrete Cosine Transform Image Block Image Code Discrete Cosine Transform Coefficient Diagonal Direction 
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  1. 1.
    Zeng, B.: Directional discrete cosine transforms – a new framework for image coding. IEEE Trans. CSVT (January 2006) (submitted)Google Scholar
  2. 2.
    Kauff, P., Schuur, K.: Shape-adaptive DCT with block-based DC separation and DDC correction. IEEE Trans. CSVT 8, 237–242 (1998)Google Scholar
  3. 3.
    ITU-T Rec. H.264 | ISO/IEC 14496-10 (AVC), Advanced video coding for generic audiovis-ual services (March 2005)Google Scholar

Copyright information

© Springer-Verlag Berlin Heidelberg 2006

Authors and Affiliations

  • Jingjing Fu
    • 1
  • Bing Zeng
    • 1
  1. 1.Department of Electrical and Electronic EngineeringThe Hong Kong University of Science and TechnologyKowloon, Hong Kong

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