Please Note That This Submission Is Intended Specifically for the Special Issue on Low Power Electronics and Design Trading Dct/idct Quality for Energy Reduction in Mpeg-2 Video Codecs
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چکیده
It would be desirable, in terms of energy conservation, to use one low complexity, approximate algorithm to do all discrete cosine transform (DCT) and inverse discrete cosine transform (IDCT) computation in an MPEG-2 video codec. However, there is a significant quality penalty associated with this approach that may not always be acceptable. A technique that applies both exact and approximate DCT/IDCT algorithms is presented for achieving a more practical tradeoff between quality and energy in MPEG-2 video codecs. Additionally, multiple quality/energy tradeoff modes can be supported with this technique to allow energy reduction scalability. This functionality is studied for a number of communication system configurations. For example, one of these systems consists of two video codecs communicating with one another. With the new technique, the energy consumption of DCT and IDCT execution in the two video codecs can be reduced to different levels depending on the dynamic needs of the application. In a conventional experimental setup employing the Flower Garden test sequence, this energy is reduced by an estimated 8% for video quality reduction of 0.4 dB average PSNR, 14% for 0.8 dB reduction, or 22% for 1.4 dB reduction. This work was carried out at the National Science Foundation's State/Industry/University Cooperative Research Centers' (NSF-S/IUCRC) Center for Low Power Electronics (CLPE). CLPE is supported by the NSF (Grant #EEC-9523338), the State of Arizona, and the following companies and foundations: BurrBrown, Inc., Conexant, Gain Technology, Intel Corporation, Medtronic Microelectronics Center, Microchip Technology, Motorola, Inc., The Motorola Foundation, Raytheon, Texas Instruments and Western Design Center.
منابع مشابه
An approach for enabling DCT/IDCT energy reduction scalability in MPEG-2 video codecs
It would be desirable, in terms of energy conservation, to use a low complexity approximate algorithm to do all DCT and IDCT computation in an MPEG-2 video codec. However, there is a significant quality penalty associated with this approach that may not always be acceptable. A practical algorithmic method is studied here for achieving scalable energy reduction during DCT and IDCT computation in...
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تاریخ انتشار 2001