A new structure of integer DCT least sensitive to finite word length expression of multipliers

While conventional DCT outputs real numbers and it is not suitable for lossless coding of images, the integer DCT (Int-DCT) outputs integer numbers and can serve as a lossless coding and lossy coding compatible to the conventional DCT. Recently, our group has proposed an optimum assignment method of...

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Bibliographic Details
Main Authors: Iwahashi, M., Dang Khoa Dang, Ohnishi, M., Chokchaitam, S.
Format: Conference Proceeding
Language:eng ; jpn
Subjects:
Circuits
Discrete cosine transforms
Discrete transforms
Equations
Hardware
Image coding
PSNR
Robustness
Transform coding
Wavelet transforms
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Summary:While conventional DCT outputs real numbers and it is not suitable for lossless coding of images, the integer DCT (Int-DCT) outputs integer numbers and can serve as a lossless coding and lossy coding compatible to the conventional DCT. Recently, our group has proposed an optimum assignment method of word length of multipliers in the Int-DCT assuming "colored" spectrum of input signals to reduce total hardware complexity of the circuit. However, it has been ignored to include variations of the integer rotation transforms. This report theoretically and experimentally investigates various rotation transforms and finds the best combination to construct the Int-DCT least sensitive to finite word length expression of multiplier coefficients. As a result, improvement up to 1.8 [dB] to the existing one was confirmed for a colored signal.
ISSN:1522-4880
2381-8549
DOI:10.1109/ICIP.2005.1530043