Patent ID: 7710603
Filing Date: 2010-05-04
Classification: H04N

Abstract:
1. An image forming apparatus capable of forming dots in α types (α is an integer satisfying α≧2), comprising: a target pixel selection device that selects a target pixel; a recording rate acquisition device that acquires a recording rate total value of dots in β types (β is an integer satisfying 2≦β≦α) among dots in α types and a recording rate for each of dots in (β−1) types; a first quantization device that conducts quantization based on the recording rate total value and determines recording of dots in quantity of i (i is an integer satisfying 0≦i≦β) on the target pixel; a target dot selection device that selects a target dot which has not been selected from dots in X types (initial value of X is X =β); a second quantization device that determines whether to record the target dot on the target pixel or not, based on the number i for dots to be recorded on the target pixel determined by the first quantization device and on the recording rate of the target dot; and a subtraction device that calculates X by subtracting the number of target dots selected from the dots in β types, wherein processes by the target dot selection device, the second quantization device and the subtraction device are repeated until X is reduced to zero in the subtraction device.