DocumentCode :
1003281
Title :
The Technique of Prescaled Integer Transform: Concept, Design and Applications
Author :
Zhang, Cixun ; Yu, Lu ; Lou, Jian ; Cham, Wai-Kuen ; Dong, Jie
Author_Institution :
Tampere Univ. of Technol., Tampere
Volume :
18
Issue :
1
fYear :
2008
Firstpage :
84
Lastpage :
97
Abstract :
Integer cosine transform (ICT) is adopted by H.264/AVC for its bit-exact implementation and significant complexity reduction compared to the discrete cosine transform (DCT) with an impact in peak signal-to-noise ratio (PSNR) of less than 0.02 dB. In this paper, a new technique, named prescaled integer transform (PIT), is proposed. With PIT, while all the merits of ICT are kept, the implementation complexity of decoder is further reduced compared to corresponding conventional ICT, which is especially important and beneficial for implementation on low-end processors. Since not all PIT kernels are good in respect of coding efficiency, design rules that lead to good PIT kernels are considered in this paper. Different types of PIT and their target applications are examined. Both fixed block-size transform and adaptive block-size transform (ABT) schemes of PIT are also studied. Experimental results show that no penalty in performance is observed with PIT when the PIT kernels employed are derived from the design rules. Up to 0.2 dB of improvement in PSNR for all intra frame coding compared to H.264/AVC can be achieved and the subjective quality is also slightly improved when PIT scheme is carefully designed. Using the same concept, a variation of PIT, post-scaled integer transform, can also be potentially designed to simplify the encoder in some special applications. PIT has been adopted in audio video coding standard (AVS), Chinese National Coding standard.
Keywords :
decoding; discrete cosine transforms; video coding; H.264/AVC; PSNR; adaptive block-size transform; audio video coding standard; discrete cosine transform; fixed block-size transform; integer cosine transform; peak sigal-to-noise ratio; prescaled integer transform; Automatic voltage control; Decoding; Discrete cosine transforms; Discrete transforms; Flyback transformers; Kernel; PSNR; Signal processing; Video coding; ABT; AVS; Adaptive block-size transform (ABT); DCT; H.264/AVC; ICT; PIT; audio video coding standard (AVS); complexity reduction; discrete cosine transform (DCT); integer cosine transform (ICT); prescaled integer transform (PIT); standard; transform; video coding;
fLanguage :
English
Journal_Title :
Circuits and Systems for Video Technology, IEEE Transactions on
Publisher :
ieee
ISSN :
1051-8215
Type :
jour
DOI :
10.1109/TCSVT.2007.913749
Filename :
4399965
Link To Document :
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