Title :
Adaptive spectrum-based variable bit truncation of discrete cosine transform (DCT) for energy-efficient wireless multimedia communication
Author :
Liu, Feng ; Tsui, Chi-ying
Author_Institution :
Hong Kong Univ. of Sci. & Technol., China
Abstract :
This work presents a new adaptive scheme to reduce the computation energy of the discrete cosine transform (DCT) architecture for image/video coding. The scheme employs the noise masking effect of quantization and the spectral difference of the quantization factors. Spectrum-based variable bit truncation is used to allocate more energy for the computations that affect the low frequency DCT coefficients more. We propose a benchmark driven search mechanism based on energy and distortion weight to find the optimal truncation sets for different quality constraints and quantization tables. They are stored in a look-up table (LUT) for the on-line reconfiguration. Simulation results show that significant energy saving is achieved with negligible quality degradation.
Keywords :
discrete cosine transforms; multimedia communication; noise; table lookup; vector quantisation; video coding; discrete cosine transform; image coding; look-up table; quantization factor; spectrum-based variable bit truncation; video coding; wireless multimedia communication; Computer architecture; Discrete cosine transforms; Energy efficiency; Low-frequency noise; Multimedia communication; Quantization; Radio spectrum management; Table lookup; Video coding; Wireless communication;
Conference_Titel :
Embedded Systems for Real-Time Multimedia, 2004. ESTImedia 2004. 2nd Workshop on
Print_ISBN :
0-7803-8631-0
DOI :
10.1109/ESTMED.2004.1359712