Title :
Analytical evaluation of integer DCT
Author :
Iwahashi, Masahiro ; Ohnishi, Masahiro
Author_Institution :
Nagaoka Univ. of Technol., Niigata, Japan
Abstract :
This report analytically evaluates some previously proposed integer DCT algorithms in respect of compatibility with the normal DCT, the rounding error peculiar to the integer DCT, and performance of lossless coding and lossy coding, respectively. Under the assumption that the image signal´s characteristics is approximated to the AR(1) model, optimum word length is assigned to each of the multipliers and error due to the finite word length expression of the multipliers is evaluated.
Keywords :
autoregressive processes; discrete cosine transforms; image coding; optimisation; roundoff errors; transform coding; AR(1) model; compatibility; finite word length expression; image coding; integer DCT; lossless coding; lossy coding; multipliers; optimum word length; rounding error; Algorithm design and analysis; Analysis of variance; Decoding; Degradation; Discrete cosine transforms; Discrete transforms; Image coding; Performance loss; Roundoff errors; Wavelet transforms;
Conference_Titel :
Communications and Information Technology, 2004. ISCIT 2004. IEEE International Symposium on
Print_ISBN :
0-7803-8593-4
DOI :
10.1109/ISCIT.2004.1413883
