JP2013251923A5 - - Google Patents

Claims (10)

A reception unit that receives designation of a shift amount of the correction pixel to be corrected in the sub-scanning direction;
A position determination unit that performs a position determination process for determining the position of the correction pixel based on a calculation formula corresponding to the shift amount that has received the designation;
A scaling unit that scales the input image data by adding or deleting the correction pixel at the determined position of the input image data;
An image forming apparatus comprising:   The position determination unit performs the position determination process based on a calculation formula for calculating a position of the correction pixel so that a direction in which the correction pixels are arranged changes according to the shift amount;
  The image forming apparatus according to claim 1.   The reception unit receives the shift amount that is a value greater than or equal to a specific value, or the designation of the shift amount that is a value smaller than the specific value,
  The position determination unit performs the position determination process based on different calculation formulas when the shift amount is a value equal to or larger than the specific value and when the shift amount is a value smaller than the specific value. ,
  The image forming apparatus according to claim 2. The position determining unit calculates Y of coordinates (p, Y) representing the position of the correction pixel by using formulas (1) to (3) when B ≧ 0,
When B <0, calculate according to equations (4) to (6),
The image forming apparatus according to claim 3 .
t1 = B × {(p + Z)% S} (1)
t2 = int (Y / rate) × rate (2)
Y = t1 + t2 (3)
t1 = rate + B × {(p + Z)% S} (4)
t2 = int (Y / rate) × rate (5)
Y = t1 + t2 (6)
Here, Z is an arbitrary integer, S is a main scanning processing period, B is the shift amount, and rate = (S × B ).   The accepting unit accepts designation of the shift amount that is a value that is not divisible by a scaling factor and an offset value in the sub-scanning direction,
  The position determination unit performs the position determination process based on a calculation formula using the shift amount that is a value that is not divisible by the scaling factor and the offset value;
  The image forming apparatus according to claim 1. The position determination unit calculates Y of coordinates (p, Y) representing the position of the correction pixel according to equations (7) to ( 9 );
The image forming apparatus according to claim 5 .
t1 = offset + (B × p)% rate (7)
t2 = int (Y / rate) × rate (8)
Y = t1 + t2 (9)
Here, S is the main scanning processing cycle, B is the shift amount, rate = (S × B), and offset is a fixed value. A storage unit for storing a setting value table in which the setting value of the shift amount is associated with predetermined data;
With
The reception unit receives a shift amount corresponding to the value of the data from the setting value table;
The image forming apparatus according to claim 1. The predetermined data is a dither screen angle;
The image forming apparatus according to claim 7 . The accepting unit accepts a designation to change the setting value associated with the setting value table, stores the accepted designation in the position table,
The scaling unit performs scaling based on the set value table after the change,
The image forming apparatus according to claim 7 . A reception step for receiving designation of a shift amount in the sub-scanning direction of the correction pixel to be corrected;
A position determination step for performing a position determination process for determining the position of the correction pixel based on a calculation formula corresponding to the shift amount that has received the designation;
A scaling step of scaling the input image data by adding or deleting the correction pixel at the determined position of the input image data;
An image forming method comprising: