| 摘要 |
PURPOSE:To prevent the accumulating of a rounding error and to attain a correct operation by performing an arithmetic operation with a multiplier-fold coefficient instead of the coefficient, executing the dividing with the same multiplier finally and obtaining the result, in an arithmetic processing including a coefficient-fold processing. CONSTITUTION:Multiplying is performed by using a value kCa to multiply a certain multiplier (k) instead of an inherent coefficient Ca in a multiplying circuit 2-1, for fa(I) obtained after a prescribed arithmetic operation is executed to an input image I. When the multiplier (k) is set so that the value kCa can come to be an integer, the multiplying is executed by the integer and the error does not occur. As the result, thetab' obtained by adding Xa' with an adder circuit 2-2 is divided by a divisor (k) in a divider circuit 2-3 and an output image thetais obtained. For example, when an input output image is the multi-value image of one picture element four bits, the arithmetic operation on the way is executed by eight bits, the arithmetic operation comes to be the integer and overflowing is not executed. Thus, the accumulation of the error can be prevented and a correct arithmetic operation can be performed. |
