AVERAGE VALUE CALCULATION CIRCUIT, AVERAGE VALUE CALCULATION METHOD, AVERAGE VALUE CALCULATION PROGRAM, IMAGE PROCESSING APPARATUS PROVIDED WITH AVERAGE VALUE CALCULATION CIRCUIT, AND IMAGE FORMING APPARATUS PROVIDED WITH IMAGE PROCESSING APPARATUS

摘要

PROBLEM TO BE SOLVED: To calculate an average value with high precision without the need for increasing the circuit scale.;SOLUTION: In the case of obtaining an average value of bit data configuring a data block 21, the number of bit data is approximated in advance as an approximate value 2ⁿ/(a0×2⁰+a1×2¹+...+ak×2^k+...), where n and k are an integer of 0 or over, and ak is a coefficient and 0 or 1. A first total sum arithmetic circuit 12 totalizes the bit data configuring the data block 21 to calculate a total sum. A first shifter 13 shits bits of the total sum of the bit data in a direction of the most significant bit by the number of power times as to each number of powers of terms of ak=1 in the denominator of the approximate value to calculate each shift value. A second total sum arithmetic circuit 14 sums shift values outputted from the first shifter 13 to calculate the total sum. The second shifter 15 applies bit-shift to the total sum of the shift values outputted from the second total sum arithmetic circuit 14 in the direction of the least significant bit by n times and outputs the result as an average value.;COPYRIGHT: (C)2004,JPO