Scan linearity correction parameters addressing ROM address bits
AssigneeXerox Corporation
InventorsMichael B. Neary, Daniel Wong
Life of this patent
Estimating the term…
Abstract
This invention relates to an efficient way to calibrate and control a raster output scanner (ROS). The scan non-linearity of a ROS may be measured and an appropriate calibration curve setting for the ROS may be determined. The setting and other scan line parameters may then be used as an address to a memory, such as a read-only memory (ROM). The memory may store a set of calibration curve data and the address is used to look up the data from one of these curves. The ROS may then be controlled based on the calibration data retrieved from memory.
Claims12
A method of correcting a scan non-linearity of an imaging device, said method comprising:
- determining a current position along a scan line;
- retrieving a selling of the imaging device that identifies one of a plurality of calibration profiles stored on the imaging device;
- determining an address for calibration data based on the current position and the retrieved selling, wherein the calibration data is configured to correct for a scan non-linearity profile;
- retrieving the calibration data based on the address;
- and
- controlling an output of the imaging device based on the calibration data.
An imaging device, comprising:
- a memory configured to hold a plurality of calibration profiles;
- a state machine configured to determine a current position along a scan line, retrieve a setting that identifies one of the calibration profiles, and retrieve calibration data from the memory based on an address that is based on the current position and the setting, wherein the calibration data is configured to correct for a scan non-linearity profile;
- an encoder configured to convert the calibration data into a voltage;
- a signal generator configured to output a control signal with a frequency that is based on the voltage from the encoder;
- and
- a light source that emits light based on the control signal.
Dependencies are inferred from the claim text.