A Fast and Precise Multimedia Inverse Quantization Algorithm Based on Newton's Method
Fan Zhi-xiang · Signal Processing · 2008
In multimedia systems many nonlinear functions are applied,but they are implemented difficultly on fixed-point SOC. In this paper,considering the ability of fixed-point SOC,the limitation of memory and the performance,a method based on lookup table and newton's method is proposed.To decrease iteration times,a method to get the first precise approximation is also put forward. Through the error analysis,a compensation method for the first approximation is proposed.The experiment proves that the method pro- posed in this paper needs less memory,compared with full lookup table method and improves precision greatly compared with the method proposed by Chih-Hsu Yen.