Title :
Computation reduction for discrete cosine transform
Author :
Pao, I-Ming ; Sun, Ming-Ting
Author_Institution :
Dept. of Electr. Eng., Washington Univ., Seattle, WA, USA
fDate :
31 May-3 Jun 1998
Abstract :
This paper presents a method to accelerate software video encoders by reducing the number of operations for discrete cosine transform (DCT) and quantization. We present a model of DCT coefficients based on the information of motion compensated difference blocks. The relationship between the quantization level and DCT coefficients is also studied. Based on the model, we can adaptively make the decision of DCT calculations. A fast algorithm is also proposed for approximating the 4×4 low-frequency coefficients. The results show that significant computation reductions can be achieved with negligible peak signal-to-noise ratio (PSNR) degradations
Keywords :
discrete cosine transforms; motion compensation; quantisation (signal); video coding; computation reductions; discrete cosine transform; low-frequency coefficients; motion compensated difference blocks; peak signal-to-noise ratio; quantization; software video encoders; Acceleration; Computational modeling; Degradation; Discrete cosine transforms; Information processing; Laboratories; Motion estimation; PSNR; Quantization; Sun;
Conference_Titel :
Circuits and Systems, 1998. ISCAS '98. Proceedings of the 1998 IEEE International Symposium on
Conference_Location :
Monterey, CA
Print_ISBN :
0-7803-4455-3
DOI :
10.1109/ISCAS.1998.698816
