Conversion between ICT and DCT Coefficients
- Summary
- In the recent decades, JPEG, MPEG 1 and 2, which employ Discrete Cosine Transform (DCT) for coding, are widely used. This trend keeps growing rapidly as handheld digital image/video cameras become more and more popular in recent years. On the other hand, another transform, Integer Cosine Transform (ICT) which is an integer version of the DCT requiring mainly shift and addition operations, receives growing attention. An order-4 ICT and order-8 ICT ICT(10,9,6,2;10,4;8) were adopted in H.264 and AVS video coding standards respectively. Therefore, it is anticipated that there will be a growing demand for transcoding between video sequences coded using DCT based methods and those coded using ICT based methods. This invention provides a fast and efficient method for the conversion between order-8 DCT and ICT coefficients, which is an essential step in the transcoding operation. The ICT can be ICT(10,9,6,2;10,5;8), ICT(10,9,6,2;9,3;8), ICT(10,9,6,2;8,4;8) and ICT(10,9,6,2;10,4;8).
- Supplementary Information
- Inventor: Zhan, Wei-quan | Feng, Zhi-qiang
Priority Number: CN100391262C
IPC Current: H04N0019625
Assignee Applicant: The Chinese University of Hong Kong
Title: Signal conversion method between signal of discrete cosine transform and signal of integral cosine transtormation | Discrete cosine transformation signal transformation of signal conversion method between signal with integer cosine
Usefulness: Signal conversion method between signal of discrete cosine transform and signal of integral cosine transtormation | Discrete cosine transformation signal transformation of signal conversion method between signal with integer cosine
Novelty: Signal conversion method between signal of discrete cosine transform and signal of integral cosine transformation
- Industry
- ICT/Telecom
- Sub Category
- Telecommunication
- Application No.
- 04/ENG/164
- Others
- Inventor(s): Professor CHAM Wai Kuen, Department of Electronic Engineering
Patent Status: Chinese Patent Pending Hong Kong Patent Pending
- Country/Region
- Hong Kong
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