Minimization of finite wordlength error in 2-D FIR digital filters in the frequency domain

This paper presents a method to minimize the nite wordlength error in output signals of linear phase 2-D FIR lters. The nite wordlength errors can easily be analyzed in the frequency domain when the input signal statistics are known. In the case of white input signals, impulse responses corresponding to all levels of input impulses are optimized so as to minimize the errors. A new ROM-based lter structure is proposed in which the optimized impulse responses are stored in the ROM. The output signals are generated by superposing the impulse responses corresponding to the input levels. Many results of simulations con rm that the output signals of the proposed lters have far less errors than those of conventional lters.