| 摘要 |
PURPOSE:To control the moire generated dependently upon magnifications at the time of reduction processing of an artificial variable contrast image by changing the thinning out position with a prescribed period in accordance with the dither period of system dither. CONSTITUTION:The integer part and the fraction part of the result obtained by multiplying the reduction magnification by the dither period are held as upper and lower scales in scale upper and lower registers 12A and 12B. '0' is set as the initial value to a register 11, and one clock is inputted to the clock input terminal of the register each time when prescribed dots of picture element input as the object of reduction processing come. Each time the clock is inputted, values of registers 11 and 12B are added by an adder 13 and the accumulated value is stored in the register 11. When carry is outputted in accordance with the addition processing of the adder 13, it is added to the value of the register 12A by an adder 14. The output of the adder 14 is used as the address to output a bit pattern having the bit width in accordance with the dither period from a ROM 15 through a shift register 16. |
