Title :
Dynamic Bit-width Adaptation in DCT: Image Quality versus Computation Energy Trade-off
Author :
Park, Jongsun ; Choi, Jung Hwan ; Roy, Kaushik
Author_Institution :
Sch. of Electr. & Comput. Eng., Purdue Univ., West Lafayette, IN
Abstract :
We present a dynamic bit-width adaptation scheme in DCT applications for efficient trade-off between image quality and computation energy. Based on sensitivity differences of 64 DCT coefficients, various operand bit-widths are used for different frequency components to reduce computation energy in DCT operation. Numerical results show that our DCT architecture can achieve power savings ranging from 36 % to 75% compared to normal operation
Keywords :
digital signal processing chips; discrete cosine transforms; fixed point arithmetic; image processing; low-power electronics; computation energy; discrete cosine transform; dynamic bit-width adaptation; image quality; Application software; Arithmetic; Color; Degradation; Discrete cosine transforms; Frequency; Image quality; Power engineering and energy; Quantization; System performance;
Conference_Titel :
Design, Automation and Test in Europe, 2006. DATE '06. Proceedings
Conference_Location :
Munich
Print_ISBN :
3-9810801-1-4
DOI :
10.1109/DATE.2006.243862
