Structurally regular integer discrete cosine transform for low-bit-word-length coefficients
Taizo Suzuki, Masaaki Ikehara · 2010
This paper presents an IntDCT with only dyadic values such as k/2n(k, n ∈ N). Although some IntDCTs have been proposed, they are unsuitable for lossless-to-lossy image coding in low-bit-word-length (coefficients). First, the proposed M-channel lossless WHT (LWHT) can be constructed by only (log2M)-bit-word-length and has structural regularity. Then, our 8-channel IntDCT keeps good coding performance even In low-bit-word-length because LWHT, which is main part of IntDCT, can be implemented by 3-bit-word-length. Finally, our method is validated In lossless-to-lossy image coding.