Structurally regular integer discrete cosine transform for low-bit-word-length coefficients
Structurally regular integer discrete cosine transform for low-bit-word-length coefficients
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DOI：
10.1109/iscas.2010.5537445
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发表时间：
2010-08
期刊：
影响因子：
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通讯作者：
Taizo Suzuki;M. Ikehara
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文献类型：
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作者：
Taizo Suzuki;M. Ikehara
本文提出了一种仅具有二元值的 IntDCT，例如 k/2n (k, n 6 N)。尽管已经提出了一些 IntDCT，但它们不适合低 blt 字长（系数）的无损到有损图像编码。首先，所提出的M通道无损WHT（LWHT）可以仅由（log2 M）-blt-字长构造，并且具有结构规律性。然后，我们的 8 通道 IntDCT 即使在低 blt 字长下也能保持良好的编码性能，因为作为 IntDCT 的主要部分的 LWHT 可以通过 3 位字长来实现。最后，我们的方法在无损到有损图像编码中得到了验证。
This paper presents an IntDCT with only dyadic values such as k/2n (k, n 6 N). Although some IntDCTs have been proposed, they are unsuitable for lossless-to-lossy image coding in low-blt-word-length (coefficients). First, the proposed M-channel lossless WHT (LWHT) can be constructed by only (log2 M)-blt-word-length and has structural regularity. Then, our 8-channel IntDCT keeps good coding performance even In low-blt-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.