TY - JOUR
T1 - Integer discrete cosine transform via lossless Walsh-Hadamard transform with structural regularity for low-bit-word-length
AU - Suzuki, Taizo
AU - Ikehara, Masaaki
PY - 2010/4
Y1 - 2010/4
N2 - 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.
AB - 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.
KW - Dyadic values
KW - Integer discrete cosine transform (IntDCT)
KW - Lossless Walsh-Hadamard transform (LWHT)
KW - Lossless-tolossy image coding
KW - Lowbit-word-length
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U2 - 10.1587/transfun.E93.A.734
DO - 10.1587/transfun.E93.A.734
M3 - Article
AN - SCOPUS:77950854849
VL - E93-A
SP - 734
EP - 741
JO - IEICE Transactions on Fundamentals of Electronics, Communications and Computer Sciences
JF - IEICE Transactions on Fundamentals of Electronics, Communications and Computer Sciences
SN - 0916-8508
IS - 4
ER -