Image forming apparatus and method
AssigneeCanon Kabushiki Kaisha
InventorRyousuke Suzuki
Life of this patent
Estimating the term…
Abstract
An image forming apparatus for rendering graphics objects in a frame memory, which includes a line memory for storing dot image data for each scan line of the graphics objects, a deciding unit that decides a position of a difference pixel having different values of corresponding pixels between the scan line stored in the line memory and a target scan line immediately thereafter, and a difference updating unit that, of the dot image data stored in the line memory, updates a value of the difference pixel decided by the deciding unit to the value of the pixel in the target scan line.
Claims20
An image forming apparatus for rendering graphics objects in a frame memory, comprising:
- a line memory that stores dot image data for each scan line of the graphics objects;
- a deciding unit for deciding a position of a difference pixel having different values of corresponding pixels between the scan line stored in the line memory and a target scan line immediately thereafter;
- and
- a difference updating unit that, of the dot image data stored in the line memory, updates a value of the difference pixel decided by the deciding unit to the value of the pixel in the target scan line.
An image forming method for rendering graphics objects in a frame memory, comprising:
- a deciding step of deciding a position of a difference pixel having different values of corresponding pixels between the scan line of the graphics object stored in the line memory and a target scan line immediately thereafter;
- a difference updating step of, of the dot image data stored in the line memory, updating a value of the difference pixel decided by the deciding step to the value of the pixel in the target scan line;
- and
- a synthesizing step of synthesizing the dot image data in the line memory at a position of the frame memory equivalent to the target scan line.
A computer program recorded on a recording medium for rendering graphics objects in a frame memory, comprising:
- a code of a deciding step of deciding a position of a difference pixel having different values of corresponding pixels between the scan line of the graphics object stored in the line memory and a target scan line immediately thereafter;
- a code of a difference updating step of, of the dot image data stored in the line memory, updating a value of the difference pixel decided by the deciding step to the value of the pixel in the target scan line;
- and
- a code of a synthesizing step of synthesizing the dot image data in the line memory at a position of the frame memory equivalent to the target scan line.
An image forming apparatus comprising:
- a deciding unit that decides a position of a difference pixel having different values of corresponding pixels between a first scan line and a second scan line immediately thereafter;
- and
- a difference updating unit that, of the dot image data of the first scan line, updates a value of the position of the difference pixel decided by the deciding unit to the value of the pixel in the second scan line.
An image forming method comprising:
- a deciding step of deciding a position of a difference pixel having different values of corresponding pixels between a first scan line and a second scan line immediately thereafter;
- and
- a difference updating step of, of the dot image data of the 1 first scan line, updating a value of the position of the difference pixel decided by the deciding step to the value of the pixel in the second scan line.
A computer program for causing a computer to execute:
- a deciding step of deciding a position of a difference pixel having different values of corresponding pixels between a first scan line and a second scan line immediately thereafter;
- and
- a difference updating step of, of the dot image data of the first scan line, updating a value of the position of the difference pixel decided by the deciding step to the value of the pixel in the second scan line.
Dependencies are inferred from the claim text.