Integer discrete cosine transform via lossless Walsh-Hadamard transform with structural regularity for low-bit-word-length

Taizo Suzuki, Masaaki Ikehara

Research output: Contribution to journalArticle

5 Citations (Scopus)


This paper presents an integer discrete cosine transform (IntDCT) with only dyadic values such as k/2n (k, n ∈ ℕ). Although some conventional IntDCTs have been proposed, they are not suitable for lossless-to-lossy image coding in low-bit-word-length (coefficients) due to the degradation of the frequency decomposition performance in the system. First, the proposed M-channel lossless Walsh-Hadamard transform (LWHT) can be constructed by only (log2 M)-bit-word-length and has structural regularity. Then, our 8-channel IntDCT via LWHT keeps good coding performance even if low-bit-word-length is used because LWHT, which is main part of IntDCT, can be implemented by only 3-bit-wordlength. Finally, the validity of our method is proved by showing the results of lossless-to-lossy image coding in low-bit-word-length.

Original languageEnglish
Pages (from-to)734-741
Number of pages8
JournalIEICE Transactions on Fundamentals of Electronics, Communications and Computer Sciences
Issue number4
Publication statusPublished - 2010 Apr



  • Dyadic values
  • Integer discrete cosine transform (IntDCT)
  • Lossless Walsh-Hadamard transform (LWHT)
  • Lossless-tolossy image coding
  • Lowbit-word-length

ASJC Scopus subject areas

  • Signal Processing
  • Computer Graphics and Computer-Aided Design
  • Electrical and Electronic Engineering
  • Applied Mathematics

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